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Sample records for harris dot harris

  1. Women @ Energy: Dot Harris | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Dot Harris Women @ Energy: Dot Harris March 15, 2013 - 1:06pm Addthis LaDoris (Dot) Harris is the Director of the Office of Economic Impact and Diversity. LaDoris (Dot) Harris is the Director of the Office of Economic Impact and Diversity. LaDoris (Dot) Harris is the Director of the Office of Economic Impact and Diversity. She was nominated by President Obama and confirmed by the U.S. Senate on March 29, 2012. She has served at some of the world's largest firms including General Electric, ABB

  2. Director Dot Harris Inspires Girls at DigiGirlz Day Event

    Energy.gov [DOE]

    During the 3rd Annual DigiGirlz Day event held in Nashville, TN on Saturday, February, 28, 2015, Dot Harris, Director of DOE’s Office of Economic Impact and Diversity, delivered an invigorating and...

  3. Harry A. Atwater - JCAP

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Harris Walker About Us Harris Walker - Communications Specialist, Weatherization and Intergovernmental Program Most Recent Is Your Home as Ready for Summer as You Are? June 2 Connecticut Weatherization Project Improves Lives, Receives National Recognition May 6 New Year, New Certification Opportunities for Home Energy Workers January

    Harry A. Atwater Director and Lead Principal Investigator Email: haa@caltech.edu Dr. Harry Atwater is the Director of JCAP, and the Howard Hughes Professor and

  4. A. Paul Alivisatos and Harry Atwater

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Paul Alivisatos and Harry Atwater University of California, Berkeley and Caltech Photovoltaic performance of ultra-small PbSe quantum dots Achievement: We developed a synthesis for ...

  5. Arno Harris | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Arno Harris Jump to: navigation, search Name: Arno Harris Place: California Product: Founder and General Manager of EI Solutions (formerly Prevalent Power Inc.) References: Arno...

  6. Harry Baumes | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Harry Baumes About Us Harry Baumes - Senior Executive Advisor to the Bioenergy Technologies Office and Director, Office of Energy Policy and New Uses, U.S. Department of ...

  7. Mr. Harry S. Cohen

    Office of Legacy Management (LM)

    a50b Mr. Harry S. Cohen 2956 Hathaway Road Apartment 1105 ' Richmond, Virginia 23225 Dear Mr. Cohen: ..:: The Department of Energy (DOE), as part of its Formerly Utilized Sites ...

  8. Harry Weerts | Argonne National Laboratory

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Harry Weerts, Associate Laboratory Director, Physical Sciences and Engineering Harry Weerts Associate Laboratory Director - Physical Sciences and Engineering Harry Weerts is the Associate Laboratory Director for Physical Sciences and Engineering. He oversees Argonne's interdisciplinary research programs in physics, chemistry, material science and nanotechnology. Weerts was formerly Director of Argonne's High Energy Physics division, and prior to that, a collider physicist at Fermilab, where he

  9. Department of Energy's Dot Harris Honored for Blazing Path for Women

    Energy.gov [DOE]

    Harris was one of four recipients of the 2014 EmpowHer PathMaker Award, which recognize women who exemplify the characteristics of a PathMaker, one who blazes a path for others to follow and encourages and inspires along the way.

  10. Harry S. Truman - Hanford Site

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Harry S. Truman Hanford For Students and Kids Hanford Fun Facts Classroom Projects Famous People of Hanford Albert Einstein Enrico Fermi Leslie Groves Franklin Matthias Gilbert ...

  11. North Carolina Nuclear Profile - Harris

    Energy Information Administration (EIA) (indexed site)

    Harris" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration date" ...

  12. User:Harris | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Harris Jump to: navigation, search Name harris Location Houston, Texas Edits 2 Friends User Edits DWC Bot 12006 Retrieved from "http:en.openei.orgwindex.php?titleUser:Harris&o...

  13. Harris Walker | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Harris Walker About Us Harris Walker - Communications Specialist, Weatherization and Intergovernmental Program Most Recent Is Your Home as Ready for Summer as You Are? June 2 Connecticut Weatherization Project Improves Lives, Receives National Recognition May 6 New Year, New Certification Opportunities for Home Energy Workers January

  14. Scott Blake Harris | Department of Energy

    Energy.gov [DOE] (indexed site)

    Scott Blake Harris - Former General Counsel Scott Blake Harris served as the General Counsel for the Department of Energy. Most Recent Getting Smarter About the Smart Grid October...

  15. Chioke B. Harris | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Chioke B. Harris About Us Chioke B. Harris - AAAS Science and Technology Policy Fellow (ORISE) Chioke B. Harris Chioke Harris is an AAAS Science and Technology Policy Fellow placed at the U.S. Department of Energy's Building Technologies Office in their Emerging Technologies (ET) program. His current focus is on energy-water nexus issues in the built environment, in addition to supporting a wide array of ongoing ET programs. Dr. Harris was most recently a Postdoctoral Fellow at the University of

  16. Harry Frank | Photosynthetic Antenna Research Center

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Harry Frank Harry Frank Harry Frank Harry Frank Research Affiliate E-mail: harry.frank@uconn.edu Phone: 860.486.2844 Fax: 860.486.6558 Website: University of Connecticut Research Affiliate Dr. Frank's research focus is on carotenoids, a class of biological pigments. This research includes the roles carotenoids play in photosynthesis and how carotenoids carry out those roles. He employs various techniques, including X-ray and electron diffraction, nuclear magnetic resonance (NMR), absorption and

  17. The Honorable LaDoris G. Harris | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    The Honorable LaDoris G. Harris About Us The Honorable LaDoris G. Harris - Director, Office of Economic Impact and Diversity The Honorable LaDoris G. Harris The Honorable La Doris "Dot" Harris brings over 30 years of leadership and management experience as the Director of the Office of Economic Impact and Diversity at the U.S. Department of Energy (DOE). She ensures that minorities and historically underrepresented communities are afforded opportunities to actively participate in the

  18. Women @ Energy: Deborah Harris | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Harris Women @ Energy: Deborah Harris March 11, 2013 - 5:33pm Addthis Women @ Energy: Deborah Harris Dr. Deborah Harris's current research interest is in the field of neutrino interactions and oscillations. Her work at Fermilab began with NuMI, the beamline that provides neutrinos to the MINERvA experiment, focusing on the beamline monitoring system. After working on both NOvA and MINOS oscillation experiments she realized that both of these experiments would need a better understanding of

  19. Harry Bolson | Photosynthetic Antenna Research Center

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Harry Bolson Harry Bolson placeholder image Harry Bolson Alumnus E-mail: hbbholson@wustl.edu Website: Washington University in St. Louis Mr. Bolson completed the Certificate in Renewable Energy & the Environment and graduated from Washington University in St. Louis in 2014. He is now a brand specialist with Amazon

  20. Savannah Harris | Savannah River Ecology Laboratory

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Savannah Harris SREL Graduate Program UGA Crop & Soil Savannah Harris Masters Student Seaman Lab Savannah Harris joined SREL as a research technician in John Seaman’s lab in January 2013 after completing her B.S. in biology in December 2012 at the University of South Carolina- Aiken. She also earned a cognate in geology and conducted her senior research project on the effects of geologic substrates and residuum soils on plant communities at Heggies Rock and Burks Mountain in Georgia, which

  1. Department of Energy Response to Correspondence from Mary Celeste Harris

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Related to District of Columbia Public Service Commission Docket No. EO-05-01 | Department of Energy Mary Celeste Harris Related to District of Columbia Public Service Commission Docket No. EO-05-01 Department of Energy Response to Correspondence from Mary Celeste Harris Related to District of Columbia Public Service Commission Docket No. EO-05-01 Docket No. EO-05-01: Department of Energy response to correspondence from Mary Celeste Harris related to District of Columbia Public Service

  2. COLLOQUIUM: Who Will Save the Tokamak - Harry Potter, Arnold...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    COLLOQUIUM: Who Will Save the Tokamak - Harry Potter, Arnold Schwarzenegger, Shaquille O'Neal, or Donald Trump? Professor Jeffrey Freidberg Massachusetts Institute of Technology ...

  3. Harris County, Georgia: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Harris County, Georgia Hamilton, Georgia Pine Mountain, Georgia Shiloh, Georgia Waverly Hall, Georgia West Point, Georgia Retrieved from "http:en.openei.orgw...

  4. Comments by Mary Celeste Harris on the Emergency Operation of...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    EO-05-01: Comments by Mary Celeste Harris on the Emergency Operation of Mirant's Potomac River Generating Station. "I am writing in response to your order of December 20, 2005, ...

  5. Harris Hill, New York: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Hide Map This article is a stub. You can help OpenEI by expanding it. Harris Hill is a census-designated place in Erie County, New York.1 References US...

  6. Harris County- Green Building Policy for County Buildings

    Energy.gov [DOE]

    The Harris County Facilities and Property Management (FPM) Division also requires all county buildings to meet minimum energy efficiency and sustainability measures, as described in the Best Gree...

  7. Magoon v. Harris, 46 Vt. 264, 269 (1863) | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Magoon v. Harris, 46 Vt. 264, 269 (1863) Jump to: navigation, search OpenEI Reference LibraryAdd to library Legal CaseHearing: Magoon v. Harris, 46 Vt. 264, 269 (1863)Legal...

  8. Cristal Jones-Harris | U.S. DOE Office of Science (SC)

    Office of Science (SC)

    Cristal Jones-Harris Albert Einstein Distinguished Educator Fellowship (AEF) Program Einstein Fellowship Home Eligibility Benefits Obligations How to Apply Key Dates Frequently Asked Questions Fellows Central Current Fellows Alumni Fellows Official AEF Logos Contact WDTS Home Alumni Fellows Cristal Jones-Harris Print Text Size: A A A FeedbackShare Page Cristal Jones-Harris Fellowship Placement: National Aeronautics and Space Administration Hometown: Sandy Springs, GA Cristal Jones-Harris, Ed.

  9. COLLOQUIUM: Who Will Save the Tokamak - Harry Potter, Arnold

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Schwarzenegger, Shaquille O'Neal, or Donald Trump? | Princeton Plasma Physics Lab January 20, 2015, 1:30pm to 3:00pm Colloquia MBG Auditorium COLLOQUIUM: Who Will Save the Tokamak - Harry Potter, Arnold Schwarzenegger, Shaquille O'Neal, or Donald Trump? Professor Jeffrey Freidberg Massachusetts Institute of Technology Presentation: File Presentation This paper attempts to bridge the gap between tokamak reactor design and plasma physics. The analysis demonstrates that the overall design of a

  10. Comments by Mary Celeste Harris on the Emergency Operation of Mirant's

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Potomac River Generating Station. | Department of Energy Mary Celeste Harris on the Emergency Operation of Mirant's Potomac River Generating Station. Comments by Mary Celeste Harris on the Emergency Operation of Mirant's Potomac River Generating Station. Docket No. EO-05-01: Comments by Mary Celeste Harris on the Emergency Operation of Mirant's Potomac River Generating Station. "I am writing in response to your order of December 20, 2005, declaring the emergency operation of Mirant's

  11. Brothers Harris and Sable provide spark and foundation for physicist's work

    Office of Scientific and Technical Information (OSTI)

    | OSTI, US Dept of Energy Office of Scientific and Technical Information Brothers Harris and Sable provide spark and foundation for physicist's work Back to the OSTI News Listing for 2005 Brother Harris provided the spark and Brother Sable provided the foundation for Tony Mezzacappa's early interest in physics. "I credit my getting involved in physics to a high school physics teacher, Brother Harris of Monsignor Farrell High School on Staten Island," says Dr. Mezzacappa, Corporate

  12. TO. TO. , W. B; Harris, Chief, Industrial Hygiene'Branch DA ...

    Office of Legacy Management (LM)

    To determine the minimum explosive concent d. To determine minimum electrical energy necc ... B. Harris - 2 5 3, Distribution of Personnel a. Dr. I. Hartm ann - Chief, Explosive ...

  13. Cristal Jones-Harris | U.S. DOE Office of Science (SC)

    Office of Science (SC)

    Jones-Harris has 20 years of teaching experience educating high-need secondary student populations in robotics, information technology and Advanced Placement Computer Science. Dr. ...

  14. Development of the spare parts program at Shearon Harris

    SciTech Connect

    Roberts, A.J.

    1987-01-01

    Throughout construction, testing, and commercial operation of a nuclear power plant, utilities have a need for spare parts and consumables that must meet a wide range of technical and quality assurance (QA) requirements. The applications for which parts and consumables may be used need to be identified prior to procurement to ensure that the design basis of the plant is not compromised. The spare parts program at Shearon Harris nuclear power plant supported the maintenance department with the proper parts when needed for all but 5% of the maintenance work requests.

  15. Microsoft Word - ex parte memo deLaski Harris.doc

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    On Friday, November 12 th , I spoke with DOE General Counsel Scott Blake Harris by telephone. This conversation concerned what process DOE might use for completing the new test method for residential refrigerators in light of concerns raised by the Association of Home Appliance Manufacturers.

  16. Off-shelf portion of Harris delta: a reexamination of downdip Woodbine-Eagle Ford

    SciTech Connect

    Porter, M.

    1989-03-01

    This study relates the Eagle Ford-equivalent Harris delta north of the Stuart City shelf edge with the downdip Woodbine-Eagle Ford section south of that shelf edge. Together, they comprised one large deltaic complex that divided into two major lobes at an avulsion site near Anderson County. One lobe prograded southwestward toward Kurten field in Brazos County; the other (now partly eroded) prograded southeastward beside the low-lying Sabine (uplift) landmass into Polk County. The Polk County lobe crossed the Stuart City shelf edge in the Seven Oaks-Hortense field area and continued to prograde southward into deeper and higher energy water. Such an environment caused this off-shelf Harris delta to oversteepen, resulting in frequent slumps and gravity flows that deposited debris-flow and turbidite sands along with predominantly fine-grained prodelta sediments. More familiar deltaic facies (outer fringe) are present in the uppermost section. Numerous structural and stratigraphic maps and cross sections illustrate the progradation of the downdip Harris delta and its features. The progradation was arrested for a time by deeper water at the older and more precipitous Sligo shelf edge. This progradational hiatus is recorded by a relatively strong reflection that separates two seismic sequences. The younger, onlapping sequence appears to represent continued Harris delta sedimentation. Among the interesting features mapped seismically and/or geologically are mounded reflections that represent the largest slumping events, thickness anomalies associated with the carbonate substrate, and erosional( ) channels at the section top. These off-shelf Harris delta deposits appear to interfinger laterally with a genetically different eastern (Tuscaloosa ) sequence in Tyler and Jasper Counties.

  17. Off-shelf portion of Harris delta: Reexamination of downdip Woodbine-Eagle Ford

    SciTech Connect

    Porter, M.H. ); Van Siclen, D.C.; Sheriff, R.E. )

    1989-09-01

    This study related the Eagle Ford equivalent Harris delta north of the Stuart City shelf edge with downdip Woodbine-Eagle Ford section south of that shelf edge. Together, they comprised one large deltaic complex that divided into two major lobes at an avulsion site near Anderson County, Texas. One lobe prograded southwestward toward Kurten field in Brazos County, the other (now partly eroded) prograded southeastward beside the low-lying Sabine (uplift) landmass into Polk County. The Polk County lobe crossed the Stuart City shelf edge in the Seven Oaks-Hortense field area, and continued to prograde southward into deeper and higher energy water. Such an environment caused this off-shelf Harris delta to oversteepen, resulting in frequent slumps and gravity flows that deposited debris-flow and turbidite sands along with predominantly fine-grained prodelta sediments. More familiar deltaic facies (outer fringe) are present in the uppermost section. Numerous structural and stratigraphic maps and cross sections illustrate the progradation of the downdip Harris delta and its features. The progradation was arrested for a time by deeper water at the older and more precipitous Sligo shelf edge. This progradational hiatus is recorded by a relatively strong reflection that separates two seismic sequences. The younger onlapping sequence appears to represent continued Harris delta sedimentation. among the interesting features mapped seismically and/or geologically are: mounded reflections that represent the largest slumping events, thickness anomalies associated with the carbonate substrate, and erosional( ) channels at the section top. These off-shelf Harris delta deposits appear to interfinger laterally with a genetically different eastern (Tuscaloosa ) sequence in Tyler and Jasper Counties.

  18. 3D electrostatic gyrokinetic electron and fully kinetic ion simulation of lower-hybrid drift instability of Harris current sheet

    DOE PAGES [OSTI]

    Wang, Zhenyu; Lin, Yu; Wang, Xueyi; Tummel, Kurt; Chen, Liu

    2016-07-07

    The eigenmode stability properties of three-dimensional lower-hybrid-drift-instabilities (LHDI) in a Harris current sheet with a small but finite guide magnetic field have been systematically studied by employing the gyrokinetic electron and fully kinetic ion (GeFi) particle-in-cell (PIC) simulation model with a realistic ion-to-electron mass ratio mi/me. In contrast to the fully kinetic PIC simulation scheme, the fast electron cyclotron motion and plasma oscillations are systematically removed in the GeFi model, and hence one can employ the realistic mi/me. The GeFi simulations are benchmarked against and show excellent agreement with both the fully kinetic PIC simulation and the analytical eigenmode theory.more » Our studies indicate that, for small wavenumbers, ky, along the current direction, the most unstable eigenmodes are peaked at the location where k⃗• B⃗ =0, consistent with previous analytical and simulation studies. Here, B⃗ is the equilibrium magnetic field and k⃗ is the wavevector perpendicular to the nonuniformity direction. As ky increases, however, the most unstable eigenmodes are found to be peaked at k⃗ •B⃗ ≠0. Additionally, the simulation results indicate that varying mi/me, the current sheet width, and the guide magnetic field can affect the stability of LHDI. Simulations with the varying mass ratio confirm the lower hybrid frequency and wave number scalings.« less

  19. Dear Mr. Harris,

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    The regulations define the basic model as any product that has a different energy use or ... I do not think the process the DOE used for Commercial Refrigeration Equipment was fair ...

  20. TO : W. B. Harris

    Office of Legacy Management (LM)

    (Includes cleanup) 3 0. 3. Test of Ignition tempera- ture of a cloud using Black Oxide and Uranium Hydride (including cleanup) j 0. L tininmm Explosive concen- tration 1 0. j. ...

  1. Harry E Mynick | Princeton Plasma Physics Lab

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    environmental technology and policy assessment. Mynick received his bachelor's degree in physics and mathematics with highest honors from Yale University in 1972, winning in...

  2. Fossil Energy Acting Assistant Secretary Recognized at Black...

    Energy Saver

    Addthis Director Dot Harris presents Chris Smith, Principal Deputy Assistant Secretary and ... Photo Credit: Nancy Jo Brown106FOTO Director Dot Harris presents Chris Smith, Principal ...

  3. Harris County- Property Tax Abatement for Green Commercial Buildings

    Energy.gov [DOE]

    This type of tax abatement may be sought by an applicant of the County’s standard economic development tax abatement, or as a stand-alone tax abatement. When an applicant seeks only a LEED Certif...

  4. EA-1769: Battleground Energy Recovery Project, Harris County, Texas

    Energy.gov [DOE]

    This EA evaluates the environmental impacts of a proposal to provide $1.94 million in cost-shared funding to the Houston Advanced Research Center for the Battleground Energy Recovery Project, which would produce 8 megawatts of electricity from high pressure steam generated by capturing heat that is currently lost at the Clean Harbors Deer Park facility. The proposed project was selected by the DOE's Office of Energy Efficiency and Renewable Energy to advance research and demonstration of energy efficiency and renewable energy technologies.

  5. TO I Ppi B. Harris, Chief, Industrial Rygiene Branah

    Office of Legacy Management (LM)

    may be dons at a wry slow rate, The tests were inoonolusive from the standpoint of dust dispersion. It is safe to assume that the oontsmination produoed by this form of rod ...

  6. Harry Potter, Oxford and Nuclear Energy | Department of Energy

    Energy.gov [DOE] (indexed site)

    Energy case study profiles Harbec Plastics' 750kW combined heat and power (CHP) project in Ontario, New York to improve plant-wide energy performance. Harbec Plastics: 750kW CHP Application - Project Profile (February 2006) (240.72 KB) More Documents & Publications SEP CASE STUDY WEBINAR: HARBEC SLIDES HARBEC, Inc. Case Study for Superior Energy Performance Harbec: A Fifteen Year Journey to the Beginning

    5 Year Pursuit of Sustainable Manufacturing Energy Summit 2014 Niagara Falls, On.

  7. Pressure Relief Valves Harris, S. [Villanova University, Villanova...

    Office of Scientific and Technical Information (OSTI)

    Gross, R. Exida LLC, Sellersville PA, (United States); Goble, W Savannah River Nuclear Solutions (SRNS), Aiken, SC (United States); Bukowski, J Savannah River Site...

  8. Harris County, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Power Technology Inc Power Tube Inc RRI Energy Inc formerly known as Reliant Energy Inc Red River Biodiesel Ltd Reliant Energy Ridge Energy Storage and Grid Services LP Simbol...

  9. Summer 2012 Intern Project- Rachel Harris | Center for Energy...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    In this study, organic photovoltaic devices were fabricated and tested once a day over a time span of a few days. The fabricated cells used a bulk-heterojunction active layer, ...

  10. Workplace Charging Challenge Partner: Harris Civil Engineers, LLC

    Energy.gov [DOE]

    Joined the Challenge: March 2014Headquarters: Orlando, FLCharging Location: Orlando, FLDomestic Employees: 20

  11. IDC Integrated Master Plan. Clifford, David J.; Harris, James...

    Office of Scientific and Technical Information (OSTI)

    IDC system. The IMP and the associate Integrated Master Schedule (IMS) are used for planning, scheduling, executing, and tracking the project technical work efforts. REVISIONS...

  12. Workplace Charging Challenge: Partners | Department of Energy

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    ... Power Green Wheels Greenlots Hannah Solar, LLC Harris Civil Engineers, LLC The ... Corp. Mentor Graphics MetLife, Inc. Michigan State University green-dot.png ...

  13. Applications are Open for YOU to Join the 2013 Class of the Minority...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Director Dot Harris (second from left) were Marlene Kaplan, the Deputy Director of Education and director of EPP, National Oceanic and Atmospheric Administration, Claudia...

  14. Microsoft PowerPoint - 13 DOE PM Workshop UPF Presentation revised - Harry

    Energy Saver

    Memo to DOE re conference call minutes Memo to DOE re conference call minutes DOE Notice of Inquiry on the Convention on Supplementary Compensation for Nuclear Damage (CSC) Contingent Cost Allocation --March 16, 2011 conference call with ConverDyn. Conference call minutes Memo to DOE re conference call minutes (15.08 KB) More Documents & Publications NOPR ConverDyn DOE Notice of Inquiry on the Convention on Supplementary Compensation for Nuclear Damage (CSC) Contingent Cost Allocation -

  15. Microsoft PowerPoint - 13 DOE PM Workshop UPF Presentation revised - Harry Peters [Compatibility Mode]

    Energy Saver

    Buildings | Department of Energy 6 Crawley Drive for Net Zero Energy Commercial Buildings Microsoft PowerPoint - 06 Crawley Drive for Net Zero Energy Commercial Buildings Microsoft PowerPoint - 06 Crawley Drive for Net Zero Energy Commercial Buildings (1.5 MB) More Documents & Publications Microsoft PowerPoint - 06 Crawley Drive for Net Zero Energy Commercial Buildings Aspinall Courthouse: GSA's Historic Preservation and Net-Zero Renovation A Common Definition for Zero Energy Buildings

  16. Harris Power Earns Jefferson Lab's Top Small Business Award for 2010 |

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Harold Varmus About Us Harold Varmus - Lewis Thomas University Professor of Medicine, Weill Cornell Medical College Harold Varmus Harold Varmus, M.D., co-recipient of the Nobel Prize for studies of the genetic basis of cancer, joined the Meyer Cancer Center of Weill Cornell Medical College as the Lewis Thomas University Professor of Medicine on April 1, 2015. Prior to joining Meyer Cancer Center, Dr. Varmus was the Director of the National Cancer Institute for five years. He was also the

  17. Leading experts to speak at battery & energy storage technology conference

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Leadership Leadership The Honorable LaDoris G. Harris Director, Office of Economic Impact and Diversity The Honorable La Doris "Dot" Harris brings over 30 years of management and leadership experience as the Director of the Office of Economic Impact and Diversity at the U.S. Department of Energy (DOE). She ensures that minorities and historically underrepresented communities are afforded opportunities to fully participate in the Department's programs. More about Dot Harris Andre H.

  18. Blog Archive | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    time to engage and empower the next generation of girls to rise up as leaders of our democracy and economy. March 1, 2013 Director Dot Harris spoke with over 330 students about...

  19. Empowering the Next Generation: Connecting the U.S. and African Nations through Technical Exchanges

    Energy.gov [DOE]

    At the May 2014 U.S.-Africa Energy Ministerial in Ethiopia Director Dot Harris moderated a panel focused on creating innovative partnerships and technical exchanges between American and African universities and businesses to address energy and development challenges.

  20. Statement on the Eighth Anniversary of the 9/11 Attacks | Department...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    "The families of the victims are in all of our thoughts and prayers today." Media ... of the Savannah River Special Emphasis Planning Committee, meets with Dot Harris at the ...

  1. Wrapping Up: Our Conversation on Increasing Diversity in STEM Education and

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    the Workforce | Department of Energy Wrapping Up: Our Conversation on Increasing Diversity in STEM Education and the Workforce Wrapping Up: Our Conversation on Increasing Diversity in STEM Education and the Workforce March 5, 2013 - 9:43am Addthis Watch our science and tech experts answer questions and share advice on STEM Education and Careers. Dot Harris Dot Harris Director, Office of Economic Impact and Diversity Where Can I Learn More? Visit diversity.energy.gov for more on the

  2. A Cornerstone of Our Energy Future: Women | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    A Cornerstone of Our Energy Future: Women A Cornerstone of Our Energy Future: Women March 19, 2014 - 1:47pm Addthis Secretary of Energy Ernest Moniz with The Honorable Dot Harris, Director of the Energy Department's Office of Economic Impact and Diversity (far left), and Sandra Guzman, award winning multimedia journalist, at the Minorities in Energy launch event. | Photo by the Energy Department. Secretary of Energy Ernest Moniz with The Honorable Dot Harris, Director of the Energy Department's

  3. Celebrating Small Business Week at the Energy Department | Department of

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Energy Small Business Week at the Energy Department Celebrating Small Business Week at the Energy Department June 21, 2013 - 5:23pm Addthis Energy Department Small Business Partner Success Stories Dot Harris Dot Harris Director, Office of Economic Impact and Diversity Small Business Resources Take a look at our Small Businesses 101 page for more resources. This week as the nation celebrates the 50th annual Small Business Week, we celebrate our 'small business first' philosophy and policy at

  4. Making STEM Personal: Introducing the Women @ Energy Series | Department of

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Energy STEM Personal: Introducing the Women @ Energy Series Making STEM Personal: Introducing the Women @ Energy Series March 18, 2013 - 11:53am Addthis Graphic by <a href="http://energy.gov/diversity/listings/women-energy">Sarah Gerrity</a>. Graphic by Sarah Gerrity. Dot Harris Dot Harris Director, Office of Economic Impact and Diversity Check Us Out on Pinterest Get inspired! Check out our Women @ Energy Pinboard . Occupations in Science, Technology, Engineering and

  5. Thomas Mason Oak Ridge National Lab July 10 2012 SB Summit

    Office of Environmental Management (EM)

    Women and Minorities to the Wind Industry | Department of Energy This is our Future: Secretary Chu and Senator Udall Speak on Attracting Women and Minorities to the Wind Industry This is our Future: Secretary Chu and Senator Udall Speak on Attracting Women and Minorities to the Wind Industry December 21, 2012 - 12:15pm Addthis Dot Harris Dot Harris Director, Office of Economic Impact and Diversity This past Wednesday, the Energy Department livestreamed a conversation between Energy Secretary

  6. Charles Worthington | Department of Energy

    Energy.gov [DOE] (indexed site)

    Native American Heritage Month | Department of Energy Students and faculty participating in AIREI gather at the one-week Energy Summer Institute, held at NREL last summer. Students and faculty participating in AIREI gather at the one-week Energy Summer Institute, held at NREL last summer. Dot Harris Dot Harris Director, Office of Economic Impact and Diversity Throughout November, we celebrate Native American Heritage Month as a country, honoring the first people who lived in the United

  7. A Minority Serving Institution Leads the Way in Better Buildings |

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Department of Energy A Minority Serving Institution Leads the Way in Better Buildings A Minority Serving Institution Leads the Way in Better Buildings July 5, 2012 - 6:06pm Addthis Secretary Chu visits Delaware State University to commemorate the school's efforts with the Better Buildings Initiative. Secretary Chu visits Delaware State University to commemorate the school's efforts with the Better Buildings Initiative. Dot Harris Dot Harris Director, Office of Economic Impact and Diversity

  8. Why High-performance Clouds are Best Kept In-house

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Energy Why 3D Printers Might Create the Next Robotic Champion Why 3D Printers Might Create the Next Robotic Champion December 11, 2013 - 4:18pm Addthis As the nation's premier research laboratory, Oak Ridge National Laboratory is one of the world's most capable resources for transforming the next generation of scientific discovery into solutions for rebuilding and revitalizing America's manufacturing industries, with tools like 3D printers. Dot Harris Dot Harris Director, Office of Economic

  9. History of Women at the Energy Department | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    History of Women at the Energy Department History of Women at the Energy Department March 27, 2014 - 5:55pm Addthis Dot Harris Dot Harris Director, Office of Economic Impact and Diversity Terry Fehner Terry Fehner Historian, Federal Preservation Officer Women have been making a significant impact in science, technology, engineering and mathematics (STEM) fields for centuries. Join the Energy Department in celebrating Women's History Month by viewing this timeline for a glimpse of the

  10. How Small Businesses Support the Department of Energy | Department of

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Energy Small Businesses Support the Department of Energy How Small Businesses Support the Department of Energy July 23, 2013 - 4:02pm Addthis Energy Department Small Business Partner Success Stories Dot Harris Dot Harris Director, Office of Economic Impact and Diversity What are the key facts? Almost half of the subcontracts that come from our Management and Operations contractors and other large prime contractors go to small businesses. In Fiscal Year 2012, $1.3 billion prime contracts and

  11. A New Hydrogen Processing Demonstration System | Department of Energy

    Office of Environmental Management (EM)

    Department of Energy A Minority Serving Institution Leads the Way in Better Buildings A Minority Serving Institution Leads the Way in Better Buildings July 5, 2012 - 6:06pm Addthis Secretary Chu visits Delaware State University to commemorate the school's efforts with the Better Buildings Initiative. Secretary Chu visits Delaware State University to commemorate the school's efforts with the Better Buildings Initiative. Dot Harris Dot Harris Director, Office of Economic Impact and Diversity

  12. Writing Winning Proposals | Department of Energy

    Energy Saver

    the Workforce | Department of Energy Wrapping Up: Our Conversation on Increasing Diversity in STEM Education and the Workforce Wrapping Up: Our Conversation on Increasing Diversity in STEM Education and the Workforce March 5, 2013 - 9:43am Addthis Watch our science and tech experts answer questions and share advice on STEM Education and Careers. Dot Harris Dot Harris Director, Office of Economic Impact and Diversity Where Can I Learn More? Visit diversity.energy.gov for more on the

  13. How Technology Keeps Beating Peak Oil Predictions | GE Global Research

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Energy Small Businesses Support the Department of Energy How Small Businesses Support the Department of Energy July 23, 2013 - 4:02pm Addthis Energy Department Small Business Partner Success Stories Dot Harris Dot Harris Director, Office of Economic Impact and Diversity What are the key facts? Almost half of the subcontracts that come from our Management and Operations contractors and other large prime contractors go to small businesses. In Fiscal Year 2012, $1.3 billion prime contracts and

  14. Watch Live as Secretary Moniz Kicks off the Minorities in Energy Initiative

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    | Department of Energy Watch Live as Secretary Moniz Kicks off the Minorities in Energy Initiative Watch Live as Secretary Moniz Kicks off the Minorities in Energy Initiative September 24, 2013 - 10:35am Addthis Dot Harris Dot Harris Director, Office of Economic Impact and Diversity During National Hispanic Heritage Month, we celebrate the successes of the Hispanic community and reaffirm our commitment to including persons of Hispanic descent in the Department's programs and activities.

  15. Research Affiliates | Photosynthetic Antenna Research Center

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Engel Gregory Engel Research Affiliate E-mail: gsengel@uchicago.edu Phone: 773.834.0818 Harry Frank Harry Frank Research Affiliate E-mail: harry.frank@uconn.edu Phone: 860.486.2844...

  16. 4 Questions for a Better Buildings Case Competition Student Participant:

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Harry Bergmann | Department of Energy Questions for a Better Buildings Case Competition Student Participant: Harry Bergmann 4 Questions for a Better Buildings Case Competition Student Participant: Harry Bergmann July 2, 2014 - 10:37am Addthis Harry Bergmann (first from right) helped the Xenergy team from the University of California at Santa Barbara win two Better Buildings Case Competition awards. Harry is now working as a project manager for The Energy Coalition. Harry Bergmann (first from

  17. Portsmouth Site Delivers First Radioactive Waste Shipment to...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Melissa Dunsieth, Randy Barr, Rick Williams, Janet Harris, Maureen Fischels, Cecil ... Melissa Dunsieth, Randy Barr, Rick Williams, Janet Harris, Maureen Fischels, Cecil ...

  18. Leadership | Argonne National Laboratory

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    scientific user facility in North America; and the Argonne Accelerator Institute. Harry Weerts Harry Weerts, Associate Laboratory Director, Physical Sciences and Engineering...

  19. Management Council | Argonne National Laboratory

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Illinois at Urbana-Champaign Vice Chancellor for Research Professor of Physics Web Site Harry Weerts Harry Weerts Argonne National Laboratory Interim Associate Laboratory Director...

  20. Before the Senate Energy and Natural Resources Committee | Department...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Scott Blake Harris, Nominee for General Counsel Subject: Nomination Hearing PDF icon 4-23-09FinalNominationTestimony(Harris).pdf More Documents & Publications Before the Senate...

  1. EA-1769: Draft Environmental Assessment | Department of Energy

    Office of Environmental Management (EM)

    Battleground Energy Recovery Project Harris County, Texas The proposed project is ... Energy Recovery Project Harris County, Texas, DOEEA-1769D (February 2011) More ...

  2. 'Giant' Nanocrystal Quantum Dots

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    'Giant' Nanocrystal Quantum Dots - Sandia Energy Energy Search Icon Sandia Home Locations Contact Us Employee Locator Energy & Climate Secure & Sustainable Energy Future Stationary ...

  3. Launching the Minorities in Energy Initiative | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Launching the Minorities in Energy Initiative Launching the Minorities in Energy Initiative September 11, 2013 - 2:37pm Addthis Dot Harris Dot Harris Director, Office of Economic Impact and Diversity How can I participate? Join Secretary Moniz on September 24 for the launch on our livestream, www.energy.gov/live, from 11am to 12pm EST. Diversity is mission-critical, to our agency and to our country. Without diversity of people who actively engage in the energy economy, our nation will lack a

  4. Native American Students in STEM Fields: A Critical Need for our Country |

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Department of Energy Native American Students in STEM Fields: A Critical Need for our Country Native American Students in STEM Fields: A Critical Need for our Country August 1, 2012 - 10:20am Addthis Dot Harris, Director of the Office of Economic Impact and Diversity, speaks about her engineering career to Native American students at the Intertribal Youth Summit on July 30. | Photo Credit: AnneMarie Ashburn, Department Of Energy. Dot Harris, Director of the Office of Economic Impact and

  5. Science.gov? Try ciencia.science.gov | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Science.gov? Try ciencia.science.gov Science.gov? Try ciencia.science.gov October 15, 2012 - 10:10am Addthis Science.gov? Try ciencia.science.gov Dot Harris Dot Harris Director, Office of Economic Impact and Diversity If you laid out 200 million pieces of paper in a line, you'd travel the length of 508,000 football fields - which may give you some sense of the vastness of the amount of content that was translated into Spanish from science.gov this week. The 200 million pages of authoritative

  6. Quantum Dots: Theory

    SciTech Connect

    Vukmirovic, Nenad; Wang, Lin-Wang

    2009-11-10

    This review covers the description of the methodologies typically used for the calculation of the electronic structure of self-assembled and colloidal quantum dots. These are illustrated by the results of their application to a selected set of physical effects in quantum dots.

  7. EA-1769: Final Environmental Assessment and Finding of No Significant Impact

    Energy.gov [DOE]

    Houston Advanced Research Center, Battleground Energy Recovery Project, Deer Park, Harris County, Texas (October 2011)

  8. DOT specification packages evaluation

    SciTech Connect

    Ratledge, J.E.; Rawl, R.R. )

    1991-01-01

    During the late 1960s and early 1970s, the Department of Transportation (DOT) specification package system was implemented to serve as a useful and equivalent alternative to the Nuclear Regulatory Commission (NRC) and the Bureau of Explosives approval systems for Type B and fissile radioactive material package designs. When a package design was used by a large number of organizations, the package design was added to the DOT regulations as a specification package authorized for use by any shipper. In the mid-1970s, the NRC revised its package design certification system to the one in use today. This paper reports that, while the NRC and DOT transportation regulations have evolved over the years, the DOT specification package designs have remained largely unchanged. Questions have been raised as to whether these designs meet the current and proposed regulations. In order to enable the NRC and DOT to develop a regulatory analysis that will support appropriate action regarding the specification packages, a study is being performed to compile all available design, testing, and analysis information on these packages.

  9. City of Fort Collins Comment on Information Collection Extension, October

    Energy Saver

    Chioke B. Harris About Us Chioke B. Harris - AAAS Science and Technology Policy Fellow (ORISE) Chioke B. Harris Chioke Harris is an AAAS Science & Technology Policy Fellow placed at the US Department of Energy's Building Technologies Office in their Emerging Technologies (ET) Program. His current focus is on energy-water nexus issues in the built environment, in addition to supporting a wide array of ongoing ET programs. Dr. Harris was most recently a Postdoctoral Fellow at The University of

  10. Promising future of quantum dots explored in conference

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Promising future of quantum dots explored Promising future of quantum dots explored in conference Researchers are gathering to reflect on two decades of quantum dot research at a ...

  11. Nanoscale engineering boosts performance of quantum dot light...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Quantum dot light emitting diodes Nanoscale engineering boosts performance of quantum dot light emitting diodes Quantum dots are nano-sized semiconductor particles whose emission ...

  12. Few Electron Quantum Dot coupling ...

    Office of Scientific and Technical Information (OSTI)

    Electron Quantum Dot coupling to Donor Implanted Electron Spins Martin Rudolph1. P. Harvey-Collard12, E. Nielson1, J.K. Gamble1, R. Muller1, T. Jacobson1, G. Ten-Eyck1, J. ...

  13. Single to quadruple quantum dots with tunable tunnel couplings

    SciTech Connect

    Takakura, T.; Noiri, A.; Obata, T.; Yoneda, J.; Yoshida, K.; Otsuka, T.; Tarucha, S.

    2014-03-17

    We prepare a gate-defined quadruple quantum dot to study the gate-tunability of single to quadruple quantum dots with finite inter-dot tunnel couplings. The measured charging energies of various double dots suggest that the dot size is governed by the gate geometry. For the triple and quadruple dots, we study the gate-tunable inter-dot tunnel couplings. For the triple dot, we find that the effective tunnel coupling between side dots significantly depends on the alignment of the center dot potential. These results imply that the present quadruple dot has a gate performance relevant for implementing spin-based four-qubits with controllable exchange couplings.

  14. Browse by Discipline -- E-print Network Subject Pathways: Environmenta...

    Office of Scientific and Technical Information (OSTI)

    I J K L M N O P Q R S T U V W X Y Z Kerekes, Tamas (Tamas Kerekes) - Department of Energy Technology, Aalborg University Kwatny, Harry G. (Harry G. Kwatny) - Department of ...

  15. Microsoft PowerPoint - Pete H's 2007 SWPA Conf Pres(NWK Proj...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    AmerenUE, Bagnell Dam FERC Re-licensing Impacts at Harry S. Truman AmerenUE, Bagnell Dam FERC Re-licensing Impacts at Harry S. Truman * FERC recommended AmerenUE initiate ...

  16. Before the House Subcommittee on Energy and Power, Committee...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    LaDoris Harris, Director of the Office of Economic Impact and Diversity Before the House Subcommittee on Energy and Power, Committee on Energy and Commerce 9-17-14LaDorisHarris ...

  17. CX-002864: Categorical Exclusion Determination

    Energy.gov [DOE]

    Harris County North Bayou Central PlantCX(s) Applied: B5.1Date: 07/01/2010Location(s): Harris County, TexasOffice(s): Energy Efficiency and Renewable Energy, Golden Field Office

  18. CX-004115: Categorical Exclusion Determination

    Energy.gov [DOE]

    Harris County North Bayou Central PlantCX(s) Applied: B5.1Date: 09/24/2010Location(s): Harris County, TexasOffice(s): Energy Efficiency and Renewable Energy, Golden Field Office

  19. Nontoxic quantum dot research improves solar cells

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Nontoxic quantum dot research improves solar cells Nontoxic quantum dot research improves solar cells Solar cells made with low-cost, nontoxic copper-based quantum dots can achieve unprecedented longevity and efficiency, according to a study by LANL and Sharp Corporation. December 10, 2013 Hunter McDaniel, Los Alamos National Laboratory postdoctoral researcher, works in the laboratory developing next-generation quantum dots that could revolutionize photovoltaic technology. Hunter McDaniel, Los

  20. Nonradiative Recombination Pathways in Noncarcinogenic Quantum Dot

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Composites | Department of Energy Nonradiative Recombination Pathways in Noncarcinogenic Quantum Dot Composites Nonradiative Recombination Pathways in Noncarcinogenic Quantum Dot Composites Lead Performer: UbiQD, LLC - Los Alamos, NM DOE Total Funding: $150,000 Project Term: February 22, 2016 - November 21, 2016 Funding Type: SBIR PROJECT OBJECTIVE Quantum dots composed of I-III-VI materials such as CuInS2 offer a compelling alternative to typical semiconductor quantum-dot systems, because

  1. What the Blank Makes Quantum Dots Blink?

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    What the Blank Makes Quantum Dots Blink? What the Blank Makes Quantum Dots Blink? Calculations confirm that surface flaws are behind fluorescence intermittency in silicon nanocrystals June 15, 2015 Contact: Margie Wylie, mwylie@lbl.gov, +1 510 486 7421 Quantum dots are semiconductors just a few nanometers in diameter that can glow Quantum dots (shown here dissolved in liquid under ultraviolet light) offer tantalizing prospects for new technologies if scientists can stop them blinking. (Photo by

  2. Jefferson Lab announces two Fall Science Series lectures; examine evidence

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    of an ancient supernova, the magic of Harry Potter | Jefferson Lab lectures; examine evidence of an ancient supernova, the magic of Harry Potter Jefferson Lab announces two Fall Science Series lectures; examine evidence of an ancient supernova, the magic of Harry Potter September 26, 2006 Remains of a star going supernova and a physics discussion of the magic found in Harry Potter books are the topics of Jefferson Lab's Fall Science Series. The first presentation, "When Stars

  3. 15.10.5 RH ECS Atwater - JCAP

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    JCAP's Harry Atwater on Critical Energy Issues (ECS Podcast) JCAP Director Harry Atwater in conversation with the Electrochemical Society's Executive Director Roque Calvo on the eve of the fifth international ECS Electrochemical Energy Summit. Related Link: ECS Blog (http://www.ecsblog.org/harry-atwater-on-critical-energy-issues/)

  4. Modeling of the quantum dot filling and the dark current of quantum dot infrared photodetectors

    SciTech Connect

    Ameen, Tarek A.; El-Batawy, Yasser M.; Abouelsaood, A. A.

    2014-02-14

    A generalized drift-diffusion model for the calculation of both the quantum dot filling profile and the dark current of quantum dot infrared photodetectors is proposed. The confined electrons inside the quantum dots produce a space-charge potential barrier between the two contacts, which controls the quantum dot filling and limits the dark current in the device. The results of the model reasonably agree with a published experimental work. It is found that increasing either the doping level or the temperature results in an exponential increase of the dark current. The quantum dot filling turns out to be nonuniform, with a dot near the contacts containing more electrons than one in the middle of the device where the dot occupation approximately equals the number of doping atoms per dot, which means that quantum dots away from contacts will be nearly unoccupied if the active region is undoped.

  5. Glacier Girl flies again | Y-12 National Security Complex

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Giving Back Through Our Talented STEM Professionals Giving Back Through Our Talented STEM Professionals January 17, 2014 - 4:51pm Addthis Events like Argonne National Laboratory's annual Introduce a Girl to Engineering Day are produced with the volunteer support of the Department of Energy's STEM professionals. Above, Director Dot Harris visits the event in 2013. Events like Argonne National Laboratory's annual Introduce a Girl to Engineering Day are produced with the volunteer support of the

  6. Light-Material Interactions in Energy Conversion - Energy Frontier Research

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Center (LMI-EFRC) Lectures & Tutorials Lectures from the LMI-EFRC "New Approaches to Full Spectrum Solar Energy Conversion" Webinar, September 3, 2015, Caltech Harry A. Atwater Quantum Dot Luminescent Concentrators Paul Alivisatos, Lawrence Berkeley National Laboratory John Rogers Control of Thermal Radiation Using Photonic Structures for Energy Applications Shanhui Fan, Stanford University Eli Yablonovitch Printing Functional Materials Jennifer Lewis, Harvard lmi logo Panel

  7. Amber Boehnlein Becomes Jefferson Lab's Chief Information Officer; Takes

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Initiative » Ambassadors of the Minorities in Energy Initiative Ambassadors of the Minorities in Energy Initiative Secretary Ernest Moniz, Marillyn A. Hewson (Lockheed Martin Corporation's Chairman, President and CEO), and Director Dot Harris gather with a few of the 2015 newly appointed Minorities in Energy Ambassadors and Champions during the Minorities in Energy Year II Anniversary Forum on October 6, 2015. Secretary Ernest Moniz, Marillyn A. Hewson (Lockheed Martin Corporation's Chairman,

  8. Fossil Energy Acting Assistant Secretary Recognized at Black Engineer of

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    the Year Awards | Department of Energy Fossil Energy Acting Assistant Secretary Recognized at Black Engineer of the Year Awards Fossil Energy Acting Assistant Secretary Recognized at Black Engineer of the Year Awards February 19, 2013 - 8:54am Addthis Director Dot Harris presents Chris Smith, Principal Deputy Assistant Secretary and Acting Assistant Secretary of Fossil Energy, with a professional achievement award at the Black Engineer of the Year Awards conference this February. Photo

  9. Giving Back Through Our Talented STEM Professionals | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Giving Back Through Our Talented STEM Professionals Giving Back Through Our Talented STEM Professionals January 17, 2014 - 4:51pm Addthis Events like Argonne National Laboratory's annual Introduce a Girl to Engineering Day are produced with the volunteer support of the Department of Energy's STEM professionals. Above, Director Dot Harris visits the event in 2013. Events like Argonne National Laboratory's annual Introduce a Girl to Engineering Day are produced with the volunteer support of the

  10. Microsoft Word - 2015webinar_flyer3.docx

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Program 8:30-9:00 am Paul Alivisatos, LBL Quantum Dot Luminescent Concentrators 9:00-9:30 am Shanhui Fan, Stanford Control of Thermal Radiation Using Photonic Structures for Energy Applications 9:30-10:00 am Jennifer Lewis, Harvard Printing Functional Materials 10:00-10:30 am Panel Discussion: Enabling Science for Full Spectrum Conversion Panelists Harry Atwater, Caltech; Jennifer Dionne, Stanford; Eli Yablonovitch, LBL Moderated by Ralph Nuzzo, LMI Director The Light-Material Interactions in

  11. Ambassadors of the Minorities in Energy Initiative | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Initiative » Ambassadors of the Minorities in Energy Initiative Ambassadors of the Minorities in Energy Initiative Secretary Ernest Moniz, Marillyn A. Hewson (Lockheed Martin Corporation's Chairman, President and CEO), and Director Dot Harris gather with a few of the 2015 newly appointed Minorities in Energy Ambassadors and Champions during the Minorities in Energy Year II Anniversary Forum on October 6, 2015. Secretary Ernest Moniz, Marillyn A. Hewson (Lockheed Martin Corporation's Chairman,

  12. Contact Us | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Contact Us Contact Us Office of Economic Impact & Diversity 1000 Independence Ave., SW Washington, DC 20585 Phone: (202) 586-8383 Fax: (202) 586-3075 Office of the Director Director, The Honorable LaDoris 'Dot' Harris Principal Deputy Director, Andre H. Sayles, Ph.D. Office of Minority Education and Community Development Deputy Director, Annie Whatle Annie.Whatley@hq.doe.gov Office of Minority Business and Economic Development Deputy Director, Karen Atkinson Karen.Atkinson@hq.doe.gov Office

  13. Quantitative multiplexed quantum dot immunohistochemistry

    SciTech Connect

    Sweeney, E.; Ward, T.H.; Gray, N.; Womack, C.; Jayson, G.; Hughes, A.; Dive, C.; Byers, R.

    2008-09-19

    Quantum dots are photostable fluorescent semiconductor nanocrystals possessing wide excitation and bright narrow, symmetrical, emission spectra. These characteristics have engendered considerable interest in their application in multiplex immunohistochemistry for biomarker quantification and co-localisation in clinical samples. Robust quantitation allows biomarker validation, and there is growing need for multiplex staining due to limited quantity of clinical samples. Most reported multiplexed quantum dot staining used sequential methods that are laborious and impractical in a high-throughput setting. Problems associated with sequential multiplex staining have been investigated and a method developed using QDs conjugated to biotinylated primary antibodies, enabling simultaneous multiplex staining with three antibodies. CD34, Cytokeratin 18 and cleaved Caspase 3 were triplexed in tonsillar tissue using an 8 h protocol, each localised to separate cellular compartments. This demonstrates utility of the method for biomarker measurement enabling rapid measurement of multiple co-localised biomarkers on single paraffin tissue sections, of importance for clinical trial studies.

  14. Quantum Dot Light Emitting Diode

    SciTech Connect

    Keith Kahen

    2008-07-31

    The project objective is to create low cost coatable inorganic light emitting diodes, composed of quantum dot emitters and inorganic nanoparticles, which have the potential for efficiencies equivalent to that of LEDs and OLEDs and lifetime, brightness, and environmental stability between that of LEDs and OLEDs. At the end of the project the Recipient shall gain an understanding of the device physics and properties of Quantum-Dot LEDs (QD-LEDs), have reliable and accurate nanocrystal synthesis routines, and have formed green-yellow emitting QD-LEDs with a device efficiency greater than 3 lumens/W, a brightness greater than 400 cd/m2, and a device operational lifetime of more than 1000 hours. Thus the aim of the project is to break the current cost-efficiency paradigm by creating novel low cost inorganic LEDs composed of inorganic nanoparticles.

  15. Quantum Dot Light Emitting Diode

    SciTech Connect

    Kahen, Keith

    2008-07-31

    The project objective is to create low cost coatable inorganic light emitting diodes, composed of quantum dot emitters and inorganic nanoparticles, which have the potential for efficiencies equivalent to that of LEDs and OLEDs and lifetime, brightness, and environmental stability between that of LEDs and OLEDs. At the end of the project the Recipient shall gain an understanding of the device physics and properties of Quantum-Dot LEDs (QD-LEDs), have reliable and accurate nanocrystal synthesis routines, and have formed green-yellow emitting QD-LEDs with a device efficiency greater than 3 lumens/W, a brightness greater than 400 cd/m{sup 2}, and a device operational lifetime of more than 1000 hours. Thus the aim of the project is to break the current cost-efficiency paradigm by creating novel low cost inorganic LEDs composed of inorganic nanoparticles.

  16. Investigation of Quantum Dot?Quantum Dot Coupling at High Hydrostatic

    Office of Scientific and Technical Information (OSTI)

    Pressure. (Conference) | SciTech Connect Investigation of Quantum Dot?Quantum Dot Coupling at High Hydrostatic Pressure. Citation Details In-Document Search Title: Investigation of Quantum Dot?Quantum Dot Coupling at High Hydrostatic Pressure. Abstract not provided. Authors: Brener, Igal ; Liu, Sheng ; Fan, Hongyou ; Luk, Ting S. ; Li, Binsong ; Prasankumar, Rohit ; Sinclair, Michael B. Publication Date: 2014-09-01 OSTI Identifier: 1241660 Report Number(s): SAND2014-17977C 537696 DOE

  17. Research Challenge 2: Quantum Dots and Phosphors

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    2: Quantum Dots and Phosphors - Sandia Energy Energy Search Icon Sandia Home Locations Contact Us Employee Locator Energy & Climate Secure & Sustainable Energy Future Stationary ...

  18. Charge state hysteresis in semiconductor quantum dots

    SciTech Connect

    Yang, C. H.; Rossi, A. Lai, N. S.; Leon, R.; Lim, W. H.; Dzurak, A. S.

    2014-11-03

    Semiconductor quantum dots provide a two-dimensional analogy for real atoms and show promise for the implementation of scalable quantum computers. Here, we investigate the charge configurations in a silicon metal-oxide-semiconductor double quantum dot tunnel coupled to a single reservoir of electrons. By operating the system in the few-electron regime, the stability diagram shows hysteretic tunnelling events that depend on the history of the dots charge occupancy. We present a model which accounts for the observed hysteretic behaviour by extending the established description for transport in double dots coupled to two reservoirs. We demonstrate that this type of device operates like a single-electron memory latch.

  19. Controlling thermal conductance through quantum dot roughening...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: Controlling thermal conductance through quantum dot roughening at interfaces. Citation Details ... Publication Date: 2011-01-01 OSTI Identifier: 1110382 Report ...

  20. Semiconductor nanocrystal quantum dot synthesis approaches towards...

    Office of Scientific and Technical Information (OSTI)

    In addition, applications that demand to utilize quantum dots as "commodity" chemicals are discussed, including solar cells and solid-state lightings. Authors: Hu, Michael Z. 1 ; ...

  1. Promising future of quantum dots explored in conference

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Promising future of quantum dots explored Promising future of quantum dots explored in conference Researchers are gathering to reflect on two decades of quantum dot research at a special topical conference, "20 Years of Quantum Dots at Los Alamos" April 13, 2015 Quantum dot LSC devices under ultraviolet illumination. Quantum dot LSC devices under ultraviolet illumination. Contact Los Alamos National Laboratory Nancy Ambrosiano Communications Office (505) 667-0471 Email "This

  2. Generation of even harmonics in coupled quantum dots (Journal...

    Office of Scientific and Technical Information (OSTI)

    Generation of even harmonics in coupled quantum dots Citation Details In-Document Search Title: Generation of even harmonics in coupled quantum dots Using the spatial-temporal...

  3. DOE Science Showcase - Quantum Dots | OSTI, US Dept of Energy...

    Office of Scientific and Technical Information (OSTI)

    For additional information, see the OSTI Catalogue of Collections. RefreshLine.png Additional Resources Quantum dot, Wikipedia Quantum dot solar cell, Wikipedia Los Alamos Quantum ...

  4. Quantum Dots Promise to Significantly Boost Solar Cell Efficiencies...

    Office of Scientific and Technical Information (OSTI)

    Quantum Dots Promise to Significantly Boost Solar Cell Efficiencies (Fact Sheet) Citation Details In-Document Search Title: Quantum Dots Promise to Significantly Boost Solar Cell ...

  5. Mastermind Session: Connecting the Dots Between the Real Estate...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Connecting the Dots Between the Real Estate Market and Residential Energy Efficiency Mastermind Session: Connecting the Dots Between the Real Estate Market and Residential Energy ...

  6. Single-dot optical emission from ultralow density well-isolated InP quantum dots

    SciTech Connect

    Ugur, A.; Hatami, F.; Masselink, W. T.; Vamivakas, A. N.; Lombez, L.; Atatuere, M.

    2008-10-06

    We demonstrate a straightforward way to obtain single well-isolated quantum dots emitting in the visible part of the spectrum and characterize the optical emission from single quantum dots using this method. Self-assembled InP quantum dots are grown using gas-source molecular-beam epitaxy over a wide range of InP deposition rates, using an ultralow growth rate of about 0.01 atomic monolayers/s, a quantum-dot density of 1 dot/{mu}m{sup 2} is realized. The resulting isolated InP quantum dots embedded in an InGaP matrix are individually characterized without the need for lithographical patterning and masks on the substrate. Such low-density quantum dots show excitonic emission at around 670 nm with a linewidth limited by instrument resolution. This system is applicable as a single-photon source for applications such as quantum cryptography.

  7. Thick-shell nanocrystal quantum dots

    SciTech Connect

    Hollingsworth, Jennifer A.; Chen, Yongfen; Klimov, Victor I.; Htoon, Han; Vela, Javier

    2011-05-03

    Colloidal nanocrystal quantum dots comprising an inner core having an average diameter of at least 1.5 nm and an outer shell, where said outer shell comprises multiple monolayers, wherein at least 30% of the quantum dots have an on-time fraction of 0.80 or greater under continuous excitation conditions for a period of time of at least 10 minutes.

  8. Photoluminescence of a quantum-dot molecule

    SciTech Connect

    Kruchinin, Stanislav Yu.; Rukhlenko, Ivan D.; Baimuratov, Anvar S.; Leonov, Mikhail Yu.; Turkov, Vadim K.; Baranov, Alexander V.; Fedorov, Anatoly V.; Gun'ko, Yurii K.

    2015-01-07

    The coherent coupling of quantum dots is a sensitive indicator of the energy and phase relaxation processes taking place in the nanostructure components. We formulate a theory of low-temperature, stationary photoluminescence from a quantum-dot molecule composed of two spherical quantum dots whose electronic subsystems are resonantly coupled via the Coulomb interaction. We show that the coupling leads to the hybridization of the first excited states of the quantum dots, manifesting itself as a pair of photoluminescence peaks with intensities and spectral positions strongly dependent on the geometric, material, and relaxation parameters of the quantum-dot molecule. These parameters are explicitly contained in the analytical expression for the photoluminescence differential cross section derived in the paper. The developed theory and expression obtained are essential in interpreting and analyzing spectroscopic data on the secondary emission of coherently coupled quantum systems.

  9. Theory Of Alkyl Terminated Silicon Quantum Dots

    SciTech Connect

    Reboredo, F; Galli, G

    2004-08-19

    We have carried out a series of ab-initio calculations to investigate changes in the optical properties of Si quantum dots as a function of surface passivation. In particular, we have compared hydrogen passivated dots with those having alkyl groups at the surface. We find that, while on clusters with reconstructed surfaces a complete alkyl passivation is possible, steric repulsion prevents full passivation of Si dots with unreconstructed surfaces. In addition, our calculations show that steric repulsion may have a dominant effect in determining the surface structure, and eventually the stability of alkyl passivated clusters, with results dependent on the length of the carbon chain. Alkyl passivation weakly affects optical gaps of silicon quantum dots, while it substantially decreases ionization potentials and electron affinities and affect their excited state properties. On the basis of our results we propose that alkyl terminated quantum dots may be size selected taking advantage of the change in ionization potential as a function of the cluster size.

  10. Leveling the Playing Field for Women: Work at the Energy Department |

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Department of Energy Leveling the Playing Field for Women: Work at the Energy Department Leveling the Playing Field for Women: Work at the Energy Department August 15, 2012 - 1:40pm Addthis Karl Fraiser, a member of the Savannah River Special Emphasis Planning Committee, meets with Dot Harris at the site’s Women’s Equality Day Celebration. | Photo by Rob Davis, Savannah River Site. Karl Fraiser, a member of the Savannah River Special Emphasis Planning Committee, meets with Dot

  11. DOT Awards University Transportation Centers $63 Million

    Energy.gov [DOE]

    The U.S. Department of Transportation's (DOT) announced approximately $63 million in grants to 33 University Transportation Centers to advance research and education programs that address critical transportation challenges.

  12. Semiconductor Nanocrystal Quantum Dot Synthesis Approaches Towards...

    Office of Scientific and Technical Information (OSTI)

    Large-Scale Industrial Production for Energy Applications CrossMark Michael Z. Hu* and ... The large quantity demands of high-quality quantum dots for advanced energy applications ...

  13. Nontoxic quantum dot research improves solar cells

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Nancy Ambrosiano Communications Office (505) 667-0471 Email "For the first time, we have certified the performance of a quantum dot sensitized solar cell at greater than 5 percent, ...

  14. Electron Spin Dynamics in Semiconductor Quantum Dots

    SciTech Connect

    Marie, X.; Belhadj, T.; Urbaszek, B.; Amand, T.; Krebs, O.; Lemaitre, A.; Voisin, P.

    2011-07-15

    An electron spin confined to a semiconductor quantum dot is not subject to the classical spin relaxation mechanisms known for free carriers but it strongly interacts with the nuclear spin system via the hyperfine interaction. We show in time resolved photoluminescence spectroscopy experiments on ensembles of self assembled InAs quantum dots in GaAs that this interaction leads to strong electron spin dephasing.

  15. First principle thousand atom quantum dot calculations

    SciTech Connect

    Wang, Lin-Wang; Li, Jingbo

    2004-03-30

    A charge patching method and an idealized surface passivation are used to calculate the single electronic states of IV-IV, III-V, II-VI semiconductor quantum dots up to a thousand atoms. This approach scales linearly and has a 1000 fold speed-up compared to direct first principle methods with a cost of eigen energy error of about 20 meV. The calculated quantum dot band gaps are parametrized for future references.

  16. (In,Mn)As multilayer quantum dot structures

    SciTech Connect

    Bouravleuv, Alexei; Sapega, Victor; Nevedomskii, Vladimir; Khrebtov, Artem; Samsonenko, Yuriy; Cirlin, George

    2014-12-08

    (In,Mn)As multilayer quantum dots structures were grown by molecular beam epitaxy using a Mn selective doping of the central parts of quantum dots. The study of the structural and magneto-optical properties of the samples with three and five layers of (In,Mn)As quantum dots has shown that during the quantum dots assembly, the out-diffusion of Mn from the layers with (In,Mn)As quantum dots can occur resulting in the formation of the extended defects. To produce a high quality structures using the elaborated technique of selective doping, the number of (In,Mn)As quantum dot layers should not exceed three.

  17. OSTIblog Articles in the quantum dots Topic | OSTI, US Dept of Energy

    Office of Scientific and Technical Information (OSTI)

    Office of Scientific and Technical Information dots

  18. Next-Generation "Giant" Quantum Dots: Performance-Engineered...

    Energy.gov [DOE] (indexed site)

    This project seeks to develop quantum-dot downconverters to be used in LED lighting. The focus will be on synthesizing red-emitting quantum dots, revealing their failure ...

  19. Surface treatment of nanocrystal quantum dots after film deposition

    DOEpatents

    Sykora, Milan; Koposov, Alexey; Fuke, Nobuhiro

    2015-02-03

    Provided are methods of surface treatment of nanocrystal quantum dots after film deposition so as to exchange the native ligands of the quantum dots for exchange ligands that result in improvement in charge extraction from the nanocrystals.

  20. Surface treatment of nanocrystal quantum dots after film deposition

    Office of Scientific and Technical Information (OSTI)

    (Patent) | SciTech Connect Patent: Surface treatment of nanocrystal quantum dots after film deposition Citation Details In-Document Search Title: Surface treatment of nanocrystal quantum dots after film deposition Provided are methods of surface treatment of nanocrystal quantum dots after film deposition so as to exchange the native ligands of the quantum dots for exchange ligands that result in improvement in charge extraction from the nanocrystals. Authors: Sykora, Milan ; Koposov, Alexey

  1. Quantum Dot-Based Cell Motility Assay

    SciTech Connect

    Gu, Weiwei; Pellegrino, Teresa; Parak Wolfgang J; Boudreau,Rosanne; Le Gros, Mark A.; Gerion, Daniele; Alivisatos, A. Paul; Larabell, Carolyn A.

    2005-06-06

    Because of their favorable physical and photochemical properties, colloidal CdSe/ZnS-semiconductor nanocrystals (commonly known as quantum dots) have enormous potential for use in biological imaging. In this report, we present an assay that uses quantum dots as markers to quantify cell motility. Cells that are seeded onto a homogeneous layer of quantum dots engulf and absorb the nanocrystals and, as a consequence, leave behind a fluorescence-free trail. By subsequently determining the ratio of cell area to fluorescence-free track area, we show that it is possible to differentiate between invasive and noninvasive cancer cells. Because this assay uses simple fluorescence detection, requires no significant data processing, and can be used in live-cell studies, it has the potential to be a powerful new tool for discriminating between invasive and noninvasive cancer cell lines or for studying cell signaling events involved in migration.

  2. Exciton binding energy in semiconductor quantum dots

    SciTech Connect

    Pokutnii, S. I.

    2010-04-15

    In the adiabatic approximation in the context of the modified effective mass approach, in which the reduced exciton effective mass {mu} = {mu}(a) is a function of the radius a of the semiconductor quantum dot, an expression for the exciton binding energy E{sub ex}(a) in the quantum dot is derived. It is found that, in the CdSe and CdS quantum dots with the radii a comparable to the Bohr exciton radii a{sub ex}, the exciton binding energy E{sub ex}(a) is substantially (respectively, 7.4 and 4.5 times) higher than the exciton binding energy in the CdSe and CdS single crystals.

  3. Ambipolar quantum dots in intrinsic silicon

    SciTech Connect

    Betz, A. C. Gonzalez-Zalba, M. F.; Podd, G.; Ferguson, A. J.

    2014-10-13

    We electrically measure intrinsic silicon quantum dots with electrostatically defined tunnel barriers. The presence of both p- and n-type ohmic contacts enables the accumulation of either electrons or holes. Thus, we are able to study both transport regimes within the same device. We investigate the effect of the tunnel barriers and the electrostatically defined quantum dots. There is greater localisation of charge states under the tunnel barriers in the case of hole conduction, leading to higher charge noise in the p-type regime.

  4. Bilayer graphene quantum dot defined by topgates

    SciTech Connect

    Müller, André; Kaestner, Bernd; Hohls, Frank; Weimann, Thomas; Pierz, Klaus; Schumacher, Hans W.

    2014-06-21

    We investigate the application of nanoscale topgates on exfoliated bilayer graphene to define quantum dot devices. At temperatures below 500 mK, the conductance underneath the grounded gates is suppressed, which we attribute to nearest neighbour hopping and strain-induced piezoelectric fields. The gate-layout can thus be used to define resistive regions by tuning into the corresponding temperature range. We use this method to define a quantum dot structure in bilayer graphene showing Coulomb blockade oscillations consistent with the gate layout.

  5. Kondo and mixed-valence regimes in multilevel quantum dots

    SciTech Connect

    Chudnovskiy, A. L.; Ulloa, S. E.

    2001-04-15

    We investigate the dependence of the ground state of a multilevel quantum dot on the coupling to an external fermionic system and on the interactions in the dot. As the coupling to the external system increases, the rearrangement of the effective energy levels in the dot signals the transition from the Kondo regime to a mixed-valence (MV) regime. The MV regime in a two-level dot is characterized by an intrinsic mixing of the levels in the dot, resulting in nonperturbative subtunneling and supertunneling phenomena that strongly influence the Kondo effect.

  6. Synthesis of CdSe quantum dots for quantum dot sensitized solar cell

    SciTech Connect

    Singh, Neetu Kapoor, Avinashi; Kumar, Vinod; Mehra, R. M.

    2014-04-24

    CdSe Quantum Dots (QDs) of size 0.85 nm were synthesized using chemical route. ZnO based Quantum Dot Sensitized Solar Cell (QDSSC) was fabricated using CdSe QDs as sensitizer. The Pre-synthesized QDs were found to be successfully adsorbed on front ZnO electrode and had potential to replace organic dyes in Dye Sensitized Solar Cells (DSSCs). The efficiency of QDSSC was obtained to be 2.06 % at AM 1.5.

  7. Inter-dot strain field effect on the optoelectronic properties of realistic InP lateral quantum-dot molecules

    SciTech Connect

    Barettin, Daniele Auf der Maur, Matthias; De Angelis, Roberta; Prosposito, Paolo; Casalboni, Mauro; Pecchia, Alessandro

    2015-03-07

    We report on numerical simulations of InP surface lateral quantum-dot molecules on In{sub 0.48}Ga{sub 0.52 }P buffer, using a model strictly derived by experimental results by extrapolation of the molecules shape from atomic force microscopy images. Our study has been inspired by the comparison of a photoluminescence spectrum of a high-density InP surface quantum dot sample with a numerical ensemble average given by a weighted sum of simulated single quantum-dot spectra. A lack of experimental optical response from the smaller dots of the sample is found to be due to strong inter-dot strain fields, which influence the optoelectronic properties of lateral quantum-dot molecules. Continuum electromechanical, k{sup →}·p{sup →} bandstructure, and optical calculations are presented for two different molecules, the first composed of two dots of nearly identical dimensions (homonuclear), the second of two dots with rather different sizes (heteronuclear). We show that in the homonuclear molecule the hydrostatic strain raises a potential barrier for the electrons in the connection zone between the dots, while conversely the holes do not experience any barrier, which considerably increases the coupling. Results for the heteronuclear molecule show instead that its dots do not appear as two separate and distinguishable structures, but as a single large dot, and no optical emission is observed in the range of higher energies where the smaller dot is supposed to emit. We believe that in samples of such a high density the smaller dots result as practically incorporated into bigger molecular structures, an effect strongly enforced by the inter-dot strain fields, and consequently it is not possible to experimentally obtain a separate optical emission from the smaller dots.

  8. Annealing-induced change in quantum dot chain formation mechanism

    SciTech Connect

    Park, Tyler D.; Colton, John S.; Farrer, Jeffrey K.; Yang, Haeyeon; Kim, Dong Jun

    2014-12-15

    Self-assembled InGaAs quantum dot chains were grown using a modified Stranski-Krastanov method in which the InGaAs layer is deposited under a low growth temperature and high arsenic overpressure, which suppresses the formation of dots until a later annealing process. The dots are capped with a 100 nm GaAs layer. Three samples, having three different annealing temperatures of 460°C, 480°C, and 500°C, were studied by transmission electron microscopy. Results indicate two distinct types of dot formation processes: dots in the 460°C and 480°C samples form from platelet precursors in a one-to-one ratio whereas the dots in the sample annealed at 500°C form through the strain-driven self-assembly process, and then grow larger via an additional Ostwald ripening process whereby dots grow into larger dots at the expense of smaller seed islands. There are consequently significant morphological differences between the two types of dots, which explain many of the previously-reported differences in optical properties. Moreover, we also report evidence of indium segregation within the dots, with little or no indium intermixing between the dots and the surrounding GaAs barrier.

  9. Senate Confirms DOE Nominees Daniel Poneman, David Sandalow, Kristina

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Johnson, Steve Koonin, Scott Harris, and Ines Triay | Department of Energy Confirms DOE Nominees Daniel Poneman, David Sandalow, Kristina Johnson, Steve Koonin, Scott Harris, and Ines Triay Senate Confirms DOE Nominees Daniel Poneman, David Sandalow, Kristina Johnson, Steve Koonin, Scott Harris, and Ines Triay May 21, 2009 - 12:00am Addthis WASHINGTON, D.C. -- This week, the Senate confirmed six DOE nominees, including Deputy Secretary Daniel Poneman, Under Secretary for Energy Kristina

  10. MEMORADUM OF EX PARTE COMMUNICATION WITH THE DEPARTMENT OF ENERGY

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    MEMORADUM OF EX PARTE COMMUNICATION WITH THE DEPARTMENT OF ENERGY Meeting Date: March 31, 2015 Attendees Ellen C. Ginsberg, Vice President and General Counsel, Nuclear Energy Institute (NEI); Scott Blake Harris, Chairman, Harris, Wiltshire & Grannis LLP; Steven Croley, General Counsel, Department of Energy (DOE); James (Ben) McRae, Assistant General Counsel, Department of Energy; and Anita Capoferri, Deputy Assistant General Counsel, Department of Energy Meeting Summary Mr. Harris and Ms.

  11. MEMORANDUM OF EX PARTE COMMUNICATION WITH THE DEPARTMENT OF ENERGY

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    EX PARTE COMMUNICATION WITH THE DEPARTMENT OF ENERGY Date of Meeting: December 30, 2014 Attendees: Scott Blake Harris, Harris, Wiltshire & Grannis LLP; Ellen Ginsberg, General Counsel, Nuclear Energy Institute; and Steven Croley, General Counsel of the Department of Energy Summary of what was discussed: Mr. Harris and Ms. Ginsberg discussed Part 810 of the Department's rules, and the September 2011 Notice of Proposed Rulemaking (NOPR) and the July 2013 Supplemental Notice of Proposed

  12. Microsoft PowerPoint - 13 Steven Simner

    Office of Environmental Management (EM)

    Peters [Compatibility Mode] | Department of Energy 3 DOE PM Workshop UPF Presentation revised - Harry Peters [Compatibility Mode] Microsoft PowerPoint - 13 DOE PM Workshop UPF Presentation revised - Harry Peters [Compatibility Mode] Microsoft PowerPoint - 13 DOE PM Workshop UPF Presentation revised - Harry Peters [Compatibility Mode] (1.2 MB) More Documents & Publications The Process, Methods and Tool Used To Integrate Safety During Design of a Category 2 Nuclear Facility Enterprise

  13. DRAFT ADVICE - UNACCEPTABLE PROGRAM IMPACTS UNDER FY 97 BUDGET

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    7, 2001 Harry Boston, Manager Department of Energy, Office of River Protection 2440 ... on the current and out year budget status of the Tank Waste Treatment Project (TWP). ...

  14. DOE - Office of Legacy Management -- Maywood Site - NJ 10

    Office of Legacy Management (LM)

    monazite sands for extraction of rare earth compounds and mantle-grade thorium nitrates. ... - AEC Memorandum; Harris to Eisenbud; Thorium Study; August 31, 1951 NJ.10-4 - ...

  15. ALSNews Vol. 334

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    past 30 years as a research scientist, testing and investigating various promising materials and technologies. As a result, Harris knows a thing or two about what the industry...

  16. Sandia Energy - SunShot Grand Challenge Summit and Technology...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    and academia to strengthen U.S. leadership in global clean energy. Secretary Chu, Harry Atwater (Director, EFRC on Light-Matter Interactions in Solar Energy Conversion),...

  17. The Columbia River System Inside Story

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    (Agency Valley) Juntura (Warmsprings) Mahon s Reservoir Harper Bully Creek Deadwood Harry Nelson Mann Creek Mason Dam (Phillips Lake) Thief Valley Non-Federal with Power Owyhee...

  18. Oak Ridge Associated Universities DE-AC05-06OR23100

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    J - LIST OF ATTACHMENTS ATTACHMENT F - KEY PERSONNEL (Revised 1302015) NAME TITLE Harry A. (Andy) Page ORISE Director Donna L. Cragle Director, Health, Energy, and...

  19. Light-Material Interactions in Energy Conversion - Energy Frontier...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Blankenship is the LMI EFRC Administrator, providing administrative support to Director Harry Atwater and Assistant Director Carrie Hofmann. She is also responsible for conference...

  20. PowerPoint Presentation

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    funding for the chosen proposal. The deadline is November 1 of each year. President Harry S. Truman Fellowship in National Security Science and Engineering Sandia is an equal...

  1. The Columbia River System: Inside Story

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    (Agency Valley) Juntura (Warmsprings) Mahon's Reservoir Harper Bully Creek Deadwood Harry Nelson Mann Creek Mason Dam (Phillips Lake) Thief Valley Non-Federal with Power Owyhee...

  2. Deep Drilling to the Magmatic Environment in Long Valley Caldera...

    OpenEI (Open Energy Information) [EERE & EIA]

    and eventually into this magma body. Authors John B. Rundle, Charles R. Carrigan, Harry C. Hardee and William C. Luth Published Journal EOS, Transactions American Geophysical...

  3. Light-Material Interactions in Energy Conversion - Energy Frontier...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    D. in Applied Physics at the California Institute of Technology, working with Professor Harry Atwater. In 2010, Dionne served as a postdoctoral research fellow in Chemistry,...

  4. SSRL 32nd Users' Meeting Oct 17 - 19, 2005

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Gilbert (UC Berkeley) Enrique Gomez (US Berkeley) Rachel Kurtz (Stanford University) Harry Li (San Jose State Univeristy) John Pople (SSRL) Erik Richman (UCLA) Mike Toney (SSRL)...

  5. Light-Material Interactions in Energy Conversion - Energy Frontier...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    1: New Light Management Mechanisms RG Leader: Eli Yablonovitch Affiliated PIs: Harry Atwater, Paul Braun, Mark Brongersma, Jennifer Dionne, Shanhui Fan, Andrei Faraon, John Rogers,...

  6. SREL Reprint #3152

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Center, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas Texas 75390-9037 2Cardiovascular Institute, Loyola University Medical Center, Maywood, ...

  7. DOE-HDBK-1169-2003; DOE Handbook Nuclear Air Cleaning Handbook

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    ... Rocky FlatsHukari Tech Services Harry Frisby Science ... Systems, Inc. H. A. Lee Atlantic Richfield Hanford Company ... energy facilities and industrial installations throughout ...

  8. Clifton Truman Daniel's visit to Oak Ridge and Y-12, part 2

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    2 President Harry S. Truman's grandson, Clifton Truman Daniel, after visiting Japan to attend an anniversary of the bombing of Hiroshima and Nagasaki, recently visited Oak Ridge to...

  9. People | NEES - EFRC | University of Maryland Energy Frontier...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Janice Reutt-Robey - UMD Yue Qi - Michigan State Thrust 4 Alec Talin - SNL-LIV ... Stephen Harris Lawrence Berkeley National Laboratory Tom Mallouk Director, Ctr Solar ...

  10. Tax Credits, Rebates & Savings | Department of Energy

    Energy.gov [DOE] (indexed site)

    electric cooperative that provides electric service to customers in Troup, Harris, Heard, Meriwether, Muscogee and Coweta counties in Georgia. Diverse Power offers......

  11. Chisago County, Minnesota: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    A. Places in Chisago County, Minnesota Center City, Minnesota Chisago City, Minnesota Harris, Minnesota Lindstrom, Minnesota North Branch, Minnesota Rush City, Minnesota Shafer,...

  12. Contacts

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Email Executive Advisor Mark Anderson (505) 667-4772 Email Program Specialist Jean Harris (505) 667-5778 Email Executive Administrator Roberta Viarreal (505) 667-9128 Email...

  13. Biological Conversion of Sugars to Hydrocarbons Technology Pathway

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    ... Eppler, R.; Bellisimi, E.; Harris, S.; Rebolledo, J.P.; Chapeaux, A.; Poon, P. (2012). "Production of the Sustainable Renewable Biofuels Farnesane from US Domestic Sweet Sorghum." ...

  14. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    al July 2015 Biased Multicomponent Reactions to Develop Novel Bromodomain Inhibitors McKeown, Michael R. ; Shaw, Daniel L. ; Fu, Harry ; Liu, Shuai ; Xu, Xiang ; Marineau, Jason ...

  15. Dark matter search results from the PICO-60 CF 3 I bubble chamber...

    Office of Scientific and Technical Information (OSTI)

    ; Harris, O. ; Jin, M. ; Krauss, C. B. ; Lafrenire, M. ; Laurin, M. ; Lawson, I. ; Levine, I. ; Lippincott, W. H. ; Mann, E. ; Maurya, D. ; Mitra, P. ; Neilson, R. ; Noble, A. ...

  16. Dark matter search results from the PICO-60 CF3I bubble chamber...

    Office of Scientific and Technical Information (OSTI)

    C. ; Harris, O. ; Jin, M. ; Krauss, C. B. ; Lafreniere, M. ; Laurin, M. ; Lawson, I. ; Levine, I. ; Lippincott, W. H. ; Mann, E. ; Maurya, D. ; Mitra, Pitam ; Neilson, R. ; Noble, ...

  17. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Response in Argillaceous Sedimentary Rock Repository for Direct Disposal of Dual-Purpose Canisters Zheng, Liange ; Rutqvist, Jonny ; Greenberg, Harris ; Birkholzer,...

  18. When Green Turns to Gold | Photosynthetic Antenna Research Center

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    When Green Turns to Gold May 6, 2014 When Green Turns to Gold PARC Certificate Graduate Harry Bolson explains the importance of LEED Certification at WUSTL

  19. An in-situ TEM liquid cell for imaging electrode/electrolyte...

    Office of Scientific and Technical Information (OSTI)

    Sullivan, John Patrick ; Jungjohann, Katherine Leigh 1 ; Zavadil, Kevin Robert 1 ; Leenheer, Andrew Jay 1 ; Harris, Charles Thomas 1 + Show Author Affiliations Sandia ...

  20. An in-situ TEM liquid cell for imaging electrode/electrolyte...

    Office of Scientific and Technical Information (OSTI)

    Leenheer, Andrew Jay ; Jungjohann, Katherine Leigh ; Zavadil, Kevin R. ; Sullivan, John P 1 ; Harris, Charles Thomas + Show Author Affiliations Sandia National Laboratories, ...

  1. "Title","Creator/Author","Publication Date","OSTI Identifier...

    Office of Scientific and Technical Information (OSTI)

    The Science of Battery Degradation.","Sullivan, John P; Fenton, Kyle R Sandia National Laboratories, Albuquerque, NM; El Gabaly Marquez, Farid; Harris, Charles Thomas Sandia...

  2. A Minority Serving Institution Leads the Way in Better Buildings...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Coons, U.S. Representative John Carney, and Delaware State University President Harry Williams at Delaware State University, a Historically Black College and University (HBCU)....

  3. Department of Energy to Host Spectrum Policy Seminar for the...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    ensure priority restoration and priority calling for utilities during times of emergency. Scott Blake Harris, General Counsel, will make introductory remarks. Featured speakers...

  4. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Overman, Cory T. (10) Fuller, Erin S. (9) Jarman, Kenneth D. (9) Miley, Harry S. (9) ... algorithms Robinson, Sean M. ; Jarman, Kenneth D. ; Pitts, W. Karl ; Seifert, Allen ; ...

  5. Multiplex automated genome engineering Church, George M; Wang...

    Office of Scientific and Technical Information (OSTI)

    Multiplex automated genome engineering Church, George M; Wang, Harris H; Isaacs, Farren J The present invention relates to automated methods of introducing multiple nucleic acid...

  6. Weerts to lead Physical Sciences and Engineering directorate...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Weerts to lead Physical Sciences and Engineering directorate By Lynn Tefft Hoff * August 10, 2015 Tweet EmailPrint Hendrik (Harry) Joseph Weerts has been named the associate...

  7. The present invention relates to automated methods of introducing...

    Office of Scientific and Technical Information (OSTI)

    The present invention relates to automated methods of introducing multiple nucleic acid sequences into one or more target cells. Authors: Church, George M. 1 ; Wang, Harris H. ...

  8. Daniel Cohen Assistant General Counsel for Legislation and Regulatory...

    Office of Environmental Management (EM)

    Heating, and Refrigeration Institute; John Mandyck of Carrier Corporation; Jeffrey Harris of the Alliance to Save Energy; Jim VerShaw of Trane International, Incorporated; two ...

  9. Comment permalink | OSTI, US Dept of Energy Office of Scientific...

    Office of Scientific and Technical Information (OSTI)

    Multicomponent Equilibrium Models for Testing Geot Carl D. Palmer; Robert W. Smith; Travis ... Exploration Douglas G. Patchen; Taury Smith; Ron Riley; Mark Baranoski; David Harris; ...

  10. Most Viewed Documents for Geosciences: September 2014 | OSTI...

    Office of Scientific and Technical Information (OSTI)

    dissolutionreprecipitation reactions Smith, M M; Walsh, S C; McNab, W W; Carroll, S A ... Exploration Douglas G. Patchen; Taury Smith; Ron Riley; Mark Baranoski; David Harris; ...

  11. June 2014 Most Viewed Documents for Geosciences | OSTI, US Dept...

    Office of Scientific and Technical Information (OSTI)

    Multicomponent Equilibrium Models for Testing Geot Carl D. Palmer; Robert W. Smith; Travis ... Exploration Douglas G. Patchen; Taury Smith; Ron Riley; Mark Baranoski; David Harris; ...

  12. March 2014 Most Viewed Documents for Geosciences | OSTI, US Dept...

    Office of Scientific and Technical Information (OSTI)

    Book for Trenton-Black River Appalachian Basin Exploration Douglas G. Patchen; Taury Smith; Ron Riley; Mark Baranoski; David Harris; John Hickman; John Bocan; Michael Hohn (2005) ...

  13. Property:Knows | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Jorn.Aabakken +, ... GregZiebold + Woodjr +, Twong +, Rgelman +, ... H Harris + DWC Bot + J JZ + GregZiebold +, Woodjr +, Dbrodt +, ... Jackie Lyndon + Meredith1219 +, Graham7781 +...

  14. Diagnosing magnetized liner inertial fusion experiments on Z...

    Office of Scientific and Technical Information (OSTI)

    Wayne 1 ; Cuneo, Michael Edward 1 ; Herrmann, Mark C. 2 more ; Mark Harry Hess ; Johns, Owen 1 ; Lamppa, Derek C. 1 ; Martin, Matthew 1 ; Porter, J. L. 1 ; ...

  15. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Filter Results Filter by Subject applied life sciences (11) materials science (11) cell ... in a two-dimensional (2D) hybrid model with an initial Harris sheet equilibrium. ...

  16. Department of Energy Subpoenas Compliance Data from AeroSys,...

    Energy Saver

    Blake Harris. "Nevertheless, both confidential information we have received and data obtained during informal discussions with AeroSys suggests that further inquiry is required. ...

  17. Contents A

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    ... Whittington; Nevada Test Site - Patricia Brooks, Clifton Clark, Michael Johnson, Ronnie ... Nelson, Harry Perry, Victor Ramirez, D. Scott Roadhouse, Larry Wigington, William Wymer; ...

  18. Towns County, Georgia: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Number 4 Climate Zone Subtype A. Places in Towns County, Georgia Hiawassee, Georgia Young Harris, Georgia Retrieved from "http:en.openei.orgwindex.php?titleTownsCounty,G...

  19. Department of Energy Response to Correspondence from Mary Celeste...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    EO-05-01 Comments by Mary Celeste Harris on the Emergency Operation of Mirant's Potomac River Generating Station. Comments on Department of Energy's Emergency Order To Resume ...

  20. Thermal Conductivity Measurements of Silicon Thin Films with...

    Office of Scientific and Technical Information (OSTI)

    Nanoscale Perforations. Abstract not provided. Authors: Harris, Charles Thomas ; Kim, Bongsang ; Reinke, Charles M. ; Hopkins, Patrick Edward ; Olsson, Roy H., ; El-Kady,...

  1. Update on Establishing the Feasibility of Lead Slowing Down Spectrosco...

    Office of Scientific and Technical Information (OSTI)

    Authors: Kulisek, Jonathan A. ; Anderson, Kevin K. ; Casella, Andrew M. ; Warren, Glen A. ; Gavron, Victor A. ; Danon, Yaron ; Weltz, Adam ; Harris, Jason ; Imel, G. R. ; Stewart, ...

  2. Lead Slowing Down Spectrometer FY2013 Annual Report (Technical...

    Office of Scientific and Technical Information (OSTI)

    Authors: Warren, Glen A. ; Kulisek, Jonathan A. ; Gavron, Victor A. ; Danon, Yaron ; Weltz, Adam ; Harris, Jason ; Stewart, T. Publication Date: 2013-10-29 OSTI Identifier: 1108159 ...

  3. Lead Slowing Down Spectrometry Analysis of Data from Measurements...

    Office of Scientific and Technical Information (OSTI)

    Funding Source(s): Authors: Warren, Glen A. ; Anderson, Kevin K. ; Kulisek, Jonathan A. ; Danon, Yaron ; Weltz, Adam ; Gavron, Victor A. ; Harris, Jason ; Stewart, Trevor N. ...

  4. Microsoft PowerPoint - HST Pumpback_Hentschel (10 Jun 09).ppt

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    HARRY S. TRUMAN PUMPBACK Power Plant Facts * Six reversible slant axis pump-turbines * ... * Additional testing and monitoring of power plant equipment will be required * Truman ...

  5. Microsoft PowerPoint - Pete H's 2008 SWPA Conf Pres(NWK Proj...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Hoists Repair Project, Harry S. Truman Power Plant * Water Supply Storage Reallocation, ... coordination (i.e. flood control, power plant, and minimum flow releases) * MOA ...

  6. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Mueller, Michael (1) Reach, William T. (1) Smith, Howard A. (1) Thomas, Cristina A. (1) ... ; Harris, Alan W. ; Hora, Joseph L. ; Smith, Howard A. ; Reach, William T. ; Emery, ...

  7. Progress and issues in single well seismic imaging | Open Energy...

    OpenEI (Open Energy Information) [EERE & EIA]

    Paper: Progress and issues in single well seismic imaging Authors Thomas M. Daley, Ernest L. Majer, Roland Gritto and Jerry M. Harris Conference 70th Annual International Meeting...

  8. Hygrogenics Corporation | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Hygrogenics Corporation Hygrogenics Corporation Presented by Kevin Harris at the National Hydrogen Assocation Conference and Hydrogen Expo PDF icon harristelecombackuppower.pdf ...

  9. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    ... Eduardo ; Crocker, Mark ; Lewis Sr, Samuel Arthur ; Lance, Michael J ; Meyer III, Harry M ; More, Karren Leslie Full Text Available January 2015 Removal of Biodiesel Precipitates ...

  10. Summer 2007 Cyclotron Institute REU Program

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    of Upsilon Particles Using the Preshower Detector in STAR (presentation, poster) Chelsea Harris Texas Southern University Dr. Rand Watson A Pyro-Electric Crystal Particle...

  11. EC Publications

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Blink, Harris Greenberg, Mark Sutton & Massimiliano Fratoni, LLNL Joe Carter & Mark Dupont, Savannah River Rob Howard, ORNL report-id SAND2011-6202 location SNL, Albuquerque, ...

  12. DOE site facility mgt contracts Internet Posting 5-2-11.xlsx

    Energy Saver

    2006 http:www.anl.govcontract Patricia ... Ames National Laboratory SC Iowa State University 124... 2008 http:www.eere.energy.govgoldenNRELPrime.aspx Jamie Harris ...

  13. DOE Facility Management Contracts Facility Owner Contractor

    Energy Saver

    2006 http:www.anl.govcontract Patricia ... Ames National Laboratory SC Iowa State University 124... 2008 http:www.eere.energy.govgoldenNRELPrime.aspx Jamie Harris ...

  14. Jack Steinberger and the Muon-Neutrino

    Office of Scientific and Technical Information (OSTI)

    Jack Steinberger and the Muon-Neutrino Resources with Additional Information Jack Steinberger Photograph by Harry Sticker, courtesy AIP Emilio Segre Visual Archives, Physics Today ...

  15. MEMORANDUM FOR: JOHN CONTI ASSISTANT ADMINISTRATOR FOR ENERGY

    Annual Energy Outlook

    University) Jeff Harris (ASE) Xiaojing Sun (Georgia Tech) Marilyn Brown (Georgia Tech) ... Roderick Jackson (ORNL) Isha Sharma (Energy and Resources Institute) Buildings Team ...

  16. DRAFT ADVICE - UNACCEPTABLE PROGRAM IMPACTS UNDER FY 97 BUDGET

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    cc: Harry Boston, Manager, U.S. Department of Energy, Office of River Protection Wade Ballard, Deputy Designated Federal Official, U.S. Department of Energy Michael...

  17. Light-Material Interactions in Energy Conversion - Energy Frontier...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Harvesting RG Leader: Shanhui Fan Affiliated PIs: Harry Atwater, Paul Braun, Jennifer Lewis, Austin Minnich, John Rogers, and Eli Yablonovitch Refractive index design via porous...

  18. Light-Material Interactions in Energy Conversion - Energy Frontier...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    4: Programmable Assembly of Photonic and Electronic Architectures RG Leader: Jennifer Lewis Affiliated PIs: Harry Atwater, Paul Braun, Nate Lewis, Ralph Nuzzo, John Rogers, Eli...

  19. A Revolutionary Hybrid Thermodynamic Cycle for Bianary Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    ... inputoutput volumetric flow ratio due to evaporation of a pure fluid. ... effectiveness for optimal performance of the Harris power cycle by selection of a binary working fluid. ...

  20. Station Footprint: Separation Distances, Storage Options, and Pre-Cooling

    Office of Energy Efficiency and Renewable Energy (EERE)

    This presentation by Aaron Harris of Sandia National Laboratories was given at the DOE Hydrogen Compression, Storage, and Dispensing Workshop in March 2013.

  1. AARD Membership Update | U.S. DOE Office of Science (SC)

    Office of Science (SC)

    Nan Phinney, (Stanford Linear Accelerator Center ) Jamie Rosenzweig, ( University of California at Los Angeles ) A. J. Stewart Smith, ( Princeton University ) Harry Weerts, ( ...

  2. Geometric spin manipulation in semiconductor quantum dots

    SciTech Connect

    Prabhakar, Sanjay Melnik, Roderick; Inomata, Akira

    2014-04-07

    We propose a method to flip the spin completely by an adiabatic transport of quantum dots. We show that it is possible to flip the spin by inducing a geometric phase on the spin state of a quantum dot. We estimate the geometric spin flip time (approximately 2 ps) which turned out to be much shorter than the experimentally reported decoherence time (approximately 100 ns) that would provide an alternative means of fliping the spin before reaching decoherence. It is important that both the Rashba coupling and the Dresselhaus coupling are present for inducing a phase necessary for spin flip. If one of them is absent, the induced phase is trivial and irrelevant for spin-flip.

  3. Controlling quantum dot energies using submonolayer bandstructure engineering

    SciTech Connect

    Yu, L.; Law, S.; Wasserman, D.; Jung, D.; Lee, M. L.; Shen, J.; Cha, J. J.

    2014-08-25

    We demonstrate control of energy states in epitaxially-grown quantum dot structures formed by stacked submonolayer InAs depositions via engineering of the internal bandstructure of the dots. Transmission electron microscopy of the stacked sub-monolayer regions shows compositional inhomogeneity, indicative of the presence of quantum dots. The quantum dot ground state is manipulated not only by the number of deposited InAs layers, but also by control of the thickness and material composition of the spacing layers between submonolayer InAs depositions. In this manner, we demonstrate the ability to shift the quantum dot ground state energy at 77?K from 1.38?eV to 1.88?eV. The results presented offer a potential avenue towards enhanced control of dot energies for a variety of optoelectronic applications.

  4. The design and synthesis of heterostructured quantum dots with dual

    Office of Scientific and Technical Information (OSTI)

    emission in the visible and infrared (Journal Article) | SciTech Connect The design and synthesis of heterostructured quantum dots with dual emission in the visible and infrared Citation Details In-Document Search Title: The design and synthesis of heterostructured quantum dots with dual emission in the visible and infrared The unique optical properties exhibited by visible emitting core/shell quantum dots with especially thick shells are the focus of widespread study, but have yet to be

  5. Nanoscale engineering boosts performance of quantum dot light emitting

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    diodes Quantum dot light emitting diodes Nanoscale engineering boosts performance of quantum dot light emitting diodes Quantum dots are nano-sized semiconductor particles whose emission color can be tuned by simply changing their dimensions. October 25, 2013 Postdoctoral researcher Young-Shin Park characterizing emission spectra of LEDs in the Los Alamos National Laboratory optical laboratory. Postdoctoral researcher Young-Shin Park characterizing emission spectra of LEDs in the Los Alamos

  6. Polarized quantum dot emission in electrohydrodynamic jet printed photonic crystals

    SciTech Connect

    See, Gloria G.; Xu, Lu; Nuzzo, Ralph G.; Sutanto, Erick; Alleyne, Andrew G.; Cunningham, Brian T.

    2015-08-03

    Tailored optical output, such as color purity and efficient optical intensity, are critical considerations for displays, particularly in mobile applications. To this end, we demonstrate a replica molded photonic crystal structure with embedded quantum dots. Electrohydrodynamic jet printing is used to control the position of the quantum dots within the device structure. This results in significantly less waste of the quantum dot material than application through drop-casting or spin coating. In addition, the targeted placement of the quantum dots minimizes any emission outside of the resonant enhancement field, which enables an 8× output enhancement and highly polarized emission from the photonic crystal structure.

  7. Ratiometric Sensing of Toxins using Quantum Dots | Argonne National...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Ratiometric Sensing of Toxins using Quantum Dots December 4, 2015 Tweet EmailPrint Botulinum neurotoxin (BoNT) presents a significant hazard under numerous realistic scenarios. ...

  8. Unraveling the mystery of quantum-dot blinking

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Tiny particles with finely tunable electronic and optical properties Quantum dots are particles between 1 and 10 nanometers in diameter. A nanometer is only one billionth of a ...

  9. Exploring Competing Kinetic Processes in Quantum Dots Linked...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Competing Kinetic Processes in Quantum Dots Linked to Electrode Surfaces March 14, 2012 at 2:30pm4-349 Mark Hybertsen Brookhaven National Laboratory, Columbia University ...

  10. Quantum Dot Tracers for Use in Engineered Geothermal

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    this project is to develop and demonstrate a new class of tracers, colloidal quantum dots, that offer great promise for use in characterizing fracture networks in EGS reservoirs. ...

  11. New Pathway Developed to Silicon Quantum Dot Devices (Fact Sheet...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    for preparing doped colloids (solutions) of silicon nanocrystals (NCs) as potential nontoxic infrared-absorbing and -emitting alternatives to metal chalcogenide quantum dots. ...

  12. Quantum Dot Materials Can Reduce Heat, Boost Electrical Output...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Quantum Dot Materials Can Reduce Heat, Boost Electrical Output May 23, 2005 Golden, Colo. - Researchers at the U.S. Department of Energy's National Renewable Energy Laboratory ...

  13. Search for: "quantum dots" | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    ... Quantum Dots Promise to Significantly Boost Solar Cell Efficiencies (Fact Sheet) Not Available In the search for a third generation of solar-cell technologies, a leading candidate ...

  14. Spin filtering in a double quantum dot device: Numerical renormalizati...

    Office of Scientific and Technical Information (OSTI)

    Country of Publication: United States Language: English Subject: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MATHEMATICAL MODELS; MATHEMATICAL SOLUTIONS; QUANTUM DOTS; ...

  15. Few Electron Quantum Dot coupling to Donor Implanted Electron...

    Office of Scientific and Technical Information (OSTI)

    Title: Few Electron Quantum Dot coupling to Donor Implanted Electron Spins. Abstract not provided. Authors: Rudolph, Martin ; Patrick Harvey-Collard ; Nielsen, Erik ; Gamble, John ...

  16. Diffusion-Controlled Synthesis of PbS and PbSe Quantum Dots with...

    Office of Scientific and Technical Information (OSTI)

    Dot Solar Cells Citation Details In-Document Search Title: Diffusion-Controlled Synthesis of PbS and PbSe Quantum Dots with in Situ Halide Passivation for Quantum Dot Solar Cells ...

  17. Emission switching in carbon dots coated CdTe quantum dots driving by pH dependent hetero-interactions

    SciTech Connect

    Dai, Xiao; Wang, Hao; Yi, Qinghua; Wang, Yun; Cong, Shan; Zhao, Jie; Sun, Yinghui; Zou, Guifu E-mail: jiexiong@uestc.edu.cn; Qian, Zhicheng; Huang, Jianwen; Xiong, Jie E-mail: jiexiong@uestc.edu.cn; Luo, Hongmei

    2015-11-16

    Due to the different emission mechanism between fluorescent carbon dots and semiconductor quantum dots (QDs), it is of interest to explore the potential emission in hetero-structured carbon dots/semiconducting QDs. Herein, we design carbon dots coated CdTe QDs (CDQDs) and investigate their inherent emission. We demonstrate switchable emission for the hetero-interactions of the CDQDs. Optical analyses indicate electron transfer between the carbon dots and the CdTe QDs. A heterojunction electron process is proposed as the driving mechanism based on N atom protonation of the carbon dots. This work advances our understanding of the interaction mechanism of the heterostructured CDQDs and benefits the future development of optoelectronic nanodevices with new functionalities.

  18. Applicability of the {bold k}{center_dot}{bold p} method to the electronic structure of quantum dots

    SciTech Connect

    Fu, H.; Wang, L.; Zunger, A.

    1998-04-01

    The {bold k}{center_dot}{bold p} method has become the {open_quotes}standard model{close_quotes} for describing the electronic structure of nanometer-size quantum dots. In this paper we perform parallel {bold k}{center_dot}{bold p} (6{times}6 and 8{times}8) and direct-diagonalization pseudopotential studies on spherical quantum dots of an ionic material{emdash}CdSe, and a covalent material{emdash}InP. By using an equivalent input in both approaches, i.e., starting from a given atomic pseudopotential and deriving from it the Luttinger parameters in {bold k}{center_dot}{bold p} calculation, we investigate the effect of the different underlying wave-function representations used in {bold k}{center_dot}{bold p} and in the more exact pseudopotential direct diagonalization. We find that (i) the 6{times}6{bold k}{center_dot}{bold p} envelope function has a distinct (odd or even) parity, while atomistic wave function is parity-mixed. The 6{times}6{bold k}{center_dot}{bold p} approach produces an incorrect order of the highest valence states for both InP and CdSe dots: the p-like level is above the s-like level. (ii) It fails to reveal that the second conduction state in small InP dots is folded from the L point in the Brillouin zone. Instead, all states in {bold k}{center_dot}{bold p} are described as {Gamma}-like. (iii) The {bold k}{center_dot}{bold p} overestimates the confinement energies of both valence states and conduction states. A wave-function projection analysis shows that the principal reasons for these {bold k}{center_dot}{bold p} errors in dots are (a) use of restricted basis set, and (b) incorrect {ital bulk} dispersion relation. Error (a) can be reduced only by increasing the number of basis functions. Error (b) can be reduced by altering the {bold k}{center_dot}{bold p} implementation so as to bend upwards the second lowest bulk band, and to couple the conduction band into the s-like dot valence state. Our direct diagonalization approach provides an

  19. EM's Richland Operations Office Marks Milestone in Preparing its

    Office of Environmental Management (EM)

    Energy Award for Role as Strong Small Businesses Advocate EM Wins Award for Role as Strong Small Businesses Advocate June 28, 2012 - 12:00pm Addthis DOE Office of Economic Impact and Diversity Director Dot Harris, left, presents the Sub-to-Prime Small Business Champion of the Year Award to EM Small Business Advocate Kay Rash, center, and EM Deputy Assistant Secretary for Acquisition and Project Management Jack Surash during DOE’s Fiscal Year 2011 DOE Secretarial Small Business Awards

  20. No Small Task: How Small Businesses are Critical to our Energy Future |

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Department of Energy No Small Task: How Small Businesses are Critical to our Energy Future No Small Task: How Small Businesses are Critical to our Energy Future July 3, 2012 - 1:25pm Addthis Shelton Clark, President of Eberline Services, receives the Small Business of the Year award from Dot Harris, Director of the Office of Economic Impact and Diversity. Eberline Services, a New Mexico-based small business, gets 90% of their business from the Energy Department. They specialize in

  1. DOT-7A packaging test procedure

    SciTech Connect

    Kelly, D.L.

    1995-01-23

    This test procedure documents the steps involved with performance testing of Department of Transportation Specification 7A (DOT-7A) Type A packages. It includes description of the performance tests, the personnel involved, appropriate safety considerations, and the procedures to be followed while performing the tests. Westinghouse Hanford Company (WHC) is conducting the evaluation and testing discussed herein for the Department of Energy-Headquarters, Division of Quality Verification and Transportation Safety (EH-321). Please note that this report is not in WHC format. This report is being submitted through the Engineering Documentation System so that it may be used for reference and information purposes.

  2. Relaxation dynamics in correlated quantum dots

    SciTech Connect

    Andergassen, S.; Schuricht, D.; Pletyukhov, M.; Schoeller, H.

    2014-12-04

    We study quantum many-body effects on the real-time evolution of the current through quantum dots. By using a non-equilibrium renormalization group approach, we provide analytic results for the relaxation dynamics into the stationary state and identify the microscopic cutoff scales that determine the transport rates. We find rich non-equilibrium physics induced by the interplay of the different energy scales. While the short-time limit is governed by universal dynamics, the long-time behavior features characteristic oscillations as well as an interplay of exponential and power-law decay.

  3. RKKY interaction in a chirally coupled double quantum dot system

    SciTech Connect

    Heine, A. W.; Tutuc, D.; Haug, R. J.; Zwicknagl, G.; Schuh, D.; Wegscheider, W.

    2013-12-04

    The competition between the Kondo effect and the Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction is investigated in a double quantum dots system, coupled via a central open conducting region. A perpendicular magnetic field induces the formation of Landau Levels which in turn give rise to the so-called Kondo chessboard pattern in the transport through the quantum dots. The two quantum dots become therefore chirally coupled via the edge channels formed in the open conducting area. In regions where both quantum dots exhibit Kondo transport the presence of the RKKY exchange interaction is probed by an analysis of the temperature dependence. The thus obtained Kondo temperature of one dot shows an abrupt increase at the onset of Kondo transport in the other, independent of the magnetic field polarity, i.e. edge state chirality in the central region.

  4. Kondo effect in coupled quantum dots under magnetic fields

    SciTech Connect

    Aono, Tomosuke; Eto, Mikio

    2001-08-15

    The Kondo effect in coupled quantum dots is investigated theoretically under magnetic fields. We show that the magnetoconductance (MC) illustrates the peak structures of Kondo resonant spectra. When the dot-dot tunneling coupling V{sub C} is smaller than the dot-lead coupling {Delta} (level broadening), Kondo resonant levels appear at the Fermi level (E{sub F}). The Zeeman splitting of the levels weakens the Kondo effect, which results in a negative MC. When V{sub C} is larger than {Delta}, the Kondo resonances form bonding and antibonding levels, located below and above E{sub F}, respectively. We observe a positive MC since the Zeeman splitting increases the overlap between the levels at E{sub F}. In the presence of antiferromagnetic spin coupling between the dots, the sign of the MC can change as a function of the gate voltage.

  5. Numerical simulation of optical feedback on a quantum dot lasers

    SciTech Connect

    Al-Khursan, Amin H.; Ghalib, Basim Abdullattif; Al-Obaidi, Sabri J.

    2012-02-15

    We use multi-population rate equations model to study feedback oscillations in the quantum dot laser. This model takes into account all peculiar characteristics in the quantum dots such as inhomogeneous broadening of the gain spectrum, the presence of the excited states on the quantum dot and the non-confined states due to the presence of wetting layer and the barrier. The contribution of quantum dot groups, which cannot follow by other models, is simulated. The results obtained from this model show the feedback oscillations, the periodic oscillations which evolves to chaos at higher injection current of higher feedback levels. The frequency fluctuation is attributed mainly to wetting layer with a considerable contribution from excited states. The simulation shows that is must be not using simple rate equation models to express quantum dots working at excited state transition.

  6. Competing interactions in semiconductor quantum dots

    DOE PAGES [OSTI]

    van den Berg, R.; Brandino, G. P.; El Araby, O.; Konik, R. M.; Gritsev, V.; Caux, J. -S.

    2014-10-14

    In this study, we introduce an integrability-based method enabling the study of semiconductor quantum dot models incorporating both the full hyperfine interaction as well as a mean-field treatment of dipole-dipole interactions in the nuclear spin bath. By performing free induction decay and spin echo simulations we characterize the combined effect of both types of interactions on the decoherence of the electron spin, for external fields ranging from low to high values. We show that for spin echo simulations the hyperfine interaction is the dominant source of decoherence at short times for low fields, and competes with the dipole-dipole interactions atmore » longer times. On the contrary, at high fields the main source of decay is due to the dipole-dipole interactions. In the latter regime an asymmetry in the echo is observed. Furthermore, the non-decaying fraction previously observed for zero field free induction decay simulations in quantum dots with only hyperfine interactions, is destroyed for longer times by the mean-field treatment of the dipolar interactions.« less

  7. Competing interactions in semiconductor quantum dots

    SciTech Connect

    van den Berg, R.; Brandino, G. P.; El Araby, O.; Konik, R. M.; Gritsev, V.; Caux, J. -S.

    2014-10-14

    In this study, we introduce an integrability-based method enabling the study of semiconductor quantum dot models incorporating both the full hyperfine interaction as well as a mean-field treatment of dipole-dipole interactions in the nuclear spin bath. By performing free induction decay and spin echo simulations we characterize the combined effect of both types of interactions on the decoherence of the electron spin, for external fields ranging from low to high values. We show that for spin echo simulations the hyperfine interaction is the dominant source of decoherence at short times for low fields, and competes with the dipole-dipole interactions at longer times. On the contrary, at high fields the main source of decay is due to the dipole-dipole interactions. In the latter regime an asymmetry in the echo is observed. Furthermore, the non-decaying fraction previously observed for zero field free induction decay simulations in quantum dots with only hyperfine interactions, is destroyed for longer times by the mean-field treatment of the dipolar interactions.

  8. ostiblog_image_quantum_dots_smaller.png | OSTI, US Dept of Energy Office of

    Office of Scientific and Technical Information (OSTI)

    Scientific and Technical Information ostiblog_image_quantum_dots_smaller.png

  9. sci_showcase_quantum_dots.png | OSTI, US Dept of Energy Office of

    Office of Scientific and Technical Information (OSTI)

    Scientific and Technical Information sci_showcase_quantum_dots.png

  10. Coherent radiation by quantum dots and magnetic nanoclusters

    SciTech Connect

    Yukalov, V. I.; Yukalova, E. P.

    2014-03-31

    The assemblies of either quantum dots or magnetic nanoclusters are studied. It is shown that such assemblies can produce coherent radiation. A method is developed for solving the systems of nonlinear equations describing the dynamics of such assemblies. The method is shown to be general and applicable to systems of different physical nature. Despite mathematical similarities of dynamical equations, the physics of the processes for quantum dots and magnetic nanoclusters is rather different. In a quantum dot assembly, coherence develops due to the Dicke effect of dot interactions through the common radiation field. For a system of magnetic clusters, coherence in the spin motion appears due to the Purcell effect caused by the feedback action of a resonator. Self-organized coherent spin radiation cannot arise without a resonator. This principal difference is connected with the different physical nature of dipole forces between the objects. Effective dipole interactions between the radiating quantum dots, appearing due to photon exchange, collectivize the dot radiation. While the dipolar spin interactions exist from the beginning, yet before radiation, and on the contrary, they dephase spin motion, thus destroying the coherence of moving spins. In addition, quantum dot radiation exhibits turbulent photon filamentation that is absent for radiating spins.

  11. Coupling capacitance between double quantum dots tunable by the number of electrons in Si quantum dots

    SciTech Connect

    Uchida, Takafumi Arita, Masashi; Takahashi, Yasuo; Fujiwara, Akira

    2015-02-28

    Tunability of capacitive coupling in the Si double-quantum-dot system is discussed by changing the number of electrons in quantum dots (QDs), in which the QDs are fabricated using pattern-dependent oxidation (PADOX) of a Si nanowire and multi-fine-gate structure. A single QD formed by PADOX is divided into multiple QDs by additional oxidation through the gap between the fine gates. When the number of electrons occupying the QDs is large, the coupling capacitance increases gradually and almost monotonically with the number of electrons. This phenomenon is attributed to the gradual growth in the effective QD size due to the increase in the number of electrons in the QDs. On the other hand, when the number of electrons changes in the few-electron regime, the coupling capacitance irregularly changes. This irregularity can be observed even up to 40 electrons. This behavior is attributable the rough structure of Si nano-dots made by PADOX. This roughness is thought to induce complicated change in the electron wave function when an electron is added to or subtracted from a QD.

  12. Zeno-logic applications of semiconductor quantum dots

    SciTech Connect

    Schneebeli, L.; Peyghambarian, N.; Feldtmann, T.; Kira, M.; Koch, S. W.

    2010-05-15

    Microscopic calculations show that CdSe-based semiconductor quantum dots with confined exciton and biexciton states are suitable candidates for Zeno-logic applications. The frequencies of the control and signal fields are chosen to guarantee very high transmission of the individual beams. If both fields are present simultaneously, they are strongly absorbed due to efficient ground-state-to-biexciton transitions. The optical Bloch equations for a three-level quantum-dot model with self-consistent light-matter coupling are solved numerically. The influence of dephasing and/or inhomogeneous dot distributions is analyzed and the conditions for satisfactory device operation are identified.

  13. Generation of even harmonics in coupled quantum dots

    SciTech Connect

    Guo Shifang; Duan Suqing; Yang Ning; Chu Weidong; Zhang Wei

    2011-07-15

    Using the spatial-temporal symmetry principle we developed recently, we propose an effective scheme for even-harmonics generation in coupled quantum dots. The relative intensity of odd and even harmonic components in the emission spectrum can be controlled by tuning the dipole couplings among the dots, which can be realized in experiments by careful design of the nanostructures. In particular, pure 2nth harmonics and (2n+1)th harmonics (where n is an integer) can be generated simultaneously with polarizations in two mutual perpendicular directions in our systems. An experimental design of the coupled dots system is presented.

  14. Charge sensing of a few-donor double quantum dot in silicon

    SciTech Connect

    Watson, T. F. Weber, B.; Büch, H.; Fuechsle, M.; Simmons, M. Y.

    2015-12-07

    We demonstrate the charge sensing of a few-donor double quantum dot precision placed with atomic resolution scanning tunnelling microscope lithography. We show that a tunnel-coupled single electron transistor (SET) can be used to detect electron transitions on both dots as well as inter-dot transitions. We demonstrate that we can control the tunnel times of the second dot to the SET island by ∼4 orders of magnitude by detuning its energy with respect to the first dot.

  15. Quantum Dot Tracers for Use in Engineered Geothermal | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Quantum Dot Tracers for Use in Engineered Geothermal Quantum Dot Tracers for Use in Engineered Geothermal Quantum Dot Tracers for Use in Engineered Geothermal presentation at the April 2013 peer review meeting held in Denver, Colorado. quantum_dot_tracers_peer2013.pdf (1.08 MB) More Documents & Publications Tracer Methods for Characterizing Fracture Stimulation in Engineered Geothermal Systems (EGS) Quantum Dot Tracers for Use in Engineered Geothermal Systems Use of Tracers to Characterize

  16. Electron states in semiconductor quantum dots

    SciTech Connect

    Dhayal, Suman S.; Ramaniah, Lavanya M.; Ruda, Harry E.; Nair, Selvakumar V.

    2014-11-28

    In this work, the electronic structures of quantum dots (QDs) of nine direct band gap semiconductor materials belonging to the group II-VI and III-V families are investigated, within the empirical tight-binding framework, in the effective bond orbital model. This methodology is shown to accurately describe these systems, yielding, at the same time, qualitative insights into their electronic properties. Various features of the bulk band structure such as band-gaps, band curvature, and band widths around symmetry points affect the quantum confinement of electrons and holes. These effects are identified and quantified. A comparison with experimental data yields good agreement with the calculations. These theoretical results would help quantify the optical response of QDs of these materials and provide useful input for applications.

  17. IDC Use Case Model Survey Version 1.1.

    SciTech Connect

    Harris, James Mark; Carr, Dorthe B.

    2015-02-01

    This document contains the brief descriptions for the actors and use cases contained in the IDC Use Case Model. REVISIONS Version Date Author/Team Revision Description Authorized by V1.0 12/2014 SNL IDC Reengineering Project Team Initial delivery M. Harris V1.1 2/2015 SNL IDC Reengineering Project Team Iteration I2 Review Comments M. Harris

  18. A triple quantum dot based nano-electromechanical memory device

    SciTech Connect

    Pozner, R.; Lifshitz, E.; Peskin, U.

    2015-09-14

    Colloidal quantum dots (CQDs) are free-standing nano-structures with chemically tunable electronic properties. This tunability offers intriguing possibilities for nano-electromechanical devices. In this work, we consider a nano-electromechanical nonvolatile memory (NVM) device incorporating a triple quantum dot (TQD) cluster. The device operation is based on a bias induced motion of a floating quantum dot (FQD) located between two bound quantum dots (BQDs). The mechanical motion is used for switching between two stable states, “ON” and “OFF” states, where ligand-mediated effective interdot forces between the BQDs and the FQD serve to hold the FQD in each stable position under zero bias. Considering realistic microscopic parameters, our quantum-classical theoretical treatment of the TQD reveals the characteristics of the NVM.

  19. Solution-Processed Solar Cells using Colloidal Quantum Dots ...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Solution-Processed Solar Cells using Colloidal Quantum Dots September 27, 2012 at 3pm36-428 Ted Sargent Department of Electrical and Computer Engineering - Canada Research Chair ...

  20. Quantum dot conjugates in a sub-micrometer fluidic channel

    DOEpatents

    Stavis, Samuel M.; Edel, Joshua B.; Samiee, Kevan T.; Craighead, Harold G.

    2008-07-29

    A nanofluidic channel fabricated in fused silica with an approximately 500 nm square cross section was used to isolate, detect and identify individual quantum dot conjugates. The channel enables the rapid detection of every fluorescent entity in solution. A laser of selected wavelength was used to excite multiple species of quantum dots and organic molecules, and the emission spectra were resolved without significant signal rejection. Quantum dots were then conjugated with organic molecules and detected to demonstrate efficient multicolor detection. PCH was used to analyze coincident detection and to characterize the degree of binding. The use of a small fluidic channel to detect quantum dots as fluorescent labels was shown to be an efficient technique for multiplexed single molecule studies. Detection of single molecule binding events has a variety of applications including high throughput immunoassays.

  1. Quantum dot conjugates in a sub-micrometer fluidic channel

    DOEpatents

    Stavis, Samuel M.; Edel, Joshua B.; Samiee, Kevan T.; Craighead, Harold G.

    2010-04-13

    A nanofluidic channel fabricated in fused silica with an approximately 500 nm square cross section was used to isolate, detect and identify individual quantum dot conjugates. The channel enables the rapid detection of every fluorescent entity in solution. A laser of selected wavelength was used to excite multiple species of quantum dots and organic molecules, and the emission spectra were resolved without significant signal rejection. Quantum dots were then conjugated with organic molecules and detected to demonstrate efficient multicolor detection. PCH was used to analyze coincident detection and to characterize the degree of binding. The use of a small fluidic channel to detect quantum dots as fluorescent labels was shown to be an efficient technique for multiplexed single molecule studies. Detection of single molecule binding events has a variety of applications including high throughput immunoassays.

  2. Comparison of quantum confinement effects between quantum wires and dots

    SciTech Connect

    Li, Jingbo; Wang, Lin-Wang

    2004-03-30

    Dimensionality is an important factor to govern the electronic structures of semiconductor nanocrystals. The quantum confinement energies in one-dimensional quantum wires and zero-dimensional quantum dots are quite different. Using large-scale first-principles calculations, we systematically study the electronic structures of semiconductor (including group IV, III-V, and II-VI) surface-passivated quantum wires and dots. The band-gap energies of quantum wires and dots have the same scaling with diameter for a given material. The ratio of band-gap-increases between quantum wires and dots is material-dependent, and slightly deviates from 0.586 predicted by effective-mass approximation. Highly linear polarization of photoluminescence in quantum wires is found. The degree of polarization decreases with the increasing temperature and size.

  3. TxDOT Access Management Manual | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Access Management Manual Jump to: navigation, search OpenEI Reference LibraryAdd to library Legal Document- OtherOther: TxDOT Access Management ManualLegal Abstract Manual prepared...

  4. Synthesis of Non-blinking Semiconductor Quantum Dots Emitting...

    Office of Scientific and Technical Information (OSTI)

    Our previous work demonstrates that Quasi-Type II CdSeCdS core-shell quantum dots with ... synthesized to reduce cadmium exposure for applications in the biological environment. ...

  5. Quantum Dot Tracers for Use in Engineered Geothermal Systems

    Energy.gov [DOE]

    DOE Geothermal Peer Review 2010 - Presentation. Project objective: To develop and demonstrate a new class of tracers„semiconductor nanoparticles(quantum dots)„that offer great promise for use in characterizing fracture networks in EGS reservoirs.

  6. Cornell dots research collaboration leads to $10M cancer center...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    dots research collaboration leads to 10M cancer center September 24th, 2015 Provided... are designed to either adhere to and light up cancer cells or quickly leave the body. ...

  7. Pulsed Thermal Processing of Self-Assembled Quantum Dot Structures

    SciTech Connect

    2009-04-01

    This factsheet describes a study that will develop the quantum dot manufacturing system for roll-to-roll thin film processing for use in applications such as solid state lighting.

  8. Collective modes of quantum dot ensembles in microcavities

    SciTech Connect

    Averkiev, N. S.; Glazov, M. M. Poddubnyi, A. N.

    2009-05-15

    Emission spectra of quantum dot arrays in zero-dimensional microcavities are studied theoretically. It is shown that their form is determined by the competition between collective superradiant mode formation and inhomogeneous broadening. A random sources method is used to calculate the photoluminescence spectra from an nonresonant pumped microcavity, and a standard diagram technique is used to provide a microscopic justification for the random sources method. The emission spectra of a microcavity are analyzed taking into account the spread of exciton energy due to inhomogeneous distribution of quantum dots and tunneling between them. It is demonstrated that the luminescence spectra of strongly tunnel-coupled quantum dots are sensitive to the dot positions, and the collective mode can (under certain conditions) be stabilized by random tunneling links.

  9. Shiny quantum dots brighten future of solar cells

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Photovoltaic solar-panel windows could be next for your ... to recent quantum-dot work by Los Alamos National ... and guided towards the slab edge equipped with a solar cell. ...

  10. NREL and Partners Demonstrate Quantum Dots that Assemble Themselves - News

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Releases | NREL and Partners Demonstrate Quantum Dots that Assemble Themselves Surprising breakthrough could bolster quantum photonics, solar cell efficiency February 8, 2013 Scientists from the U.S. Department of Energy's National Renewable Energy Laboratory and other labs have demonstrated a process whereby quantum dots can self-assemble at optimal locations in nanowires, a breakthrough that could improve solar cells, quantum computing, and lighting devices. A paper on the new technology,

  11. NREL: Transportation Research - DOE, DOT Announce Collaboration to Advance

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Smart Transportation Systems DOE, DOT Announce Collaboration to Advance Smart Transportation Systems May 17, 2016 The U.S. Department of Energy (DOE) and U.S. Department of Transportation (DOT) recently announced their collaboration to accelerate research, demonstration, and deployment of innovative transportation and alternative fuel technologies. The agencies made their formal Memorandum of Understanding known at an electric vehicle workshop in Berkeley, California. The initiative will tap

  12. Metal Halide Surface Treatment of Quantum Dots - Energy Innovation Portal

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Advanced Materials Advanced Materials Find More Like This Return to Search Metal Halide Surface Treatment of Quantum Dots National Renewable Energy Laboratory Contact NREL About This Technology Technology Marketing Summary Quantum dot (QD) solids are a solution-processed, composite thin film semiconductor system that is being developed for optoelectronics (display technology, solid state lighting, next generation photovoltaics, photodetector application, etc.). For photovoltaics, in addition to

  13. Los Alamos researchers unravel the mystery of quantum dot blinking

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Researchers unravel the mystery of quantum dot blinking Los Alamos researchers unravel the mystery of quantum dot blinking Most exciting is that the Los Alamos researchers have shown that blinking can be controlled and even completely suppressed electrochemically. November 9, 2011 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy

  14. Deformation potentials of CdSe quantum dots

    SciTech Connect

    Li, Jingbo; Wang, Lin-Wang

    2004-06-02

    The size dependent deformation potentials of CdSe quantum dots are studied by first principle and semi-empirical pseudopotentials calculations. They find that the amplitude of the quantum dot deformation potential is only slightly larger than the bulk value, and this increase is mostly caused by the off {Lambda} point deformation potentials in the bulk, which are larger in amplitude than the {Lambda} point deformation potential.

  15. Los Alamos Quantum Dots for Solar, Display Technology

    SciTech Connect

    Klimov, Victor

    2015-04-13

    Quantum dots are ultra-small bits of semiconductor matter that can be synthesized with nearly atomic precision via modern methods of colloidal chemistry. Their emission color can be tuned by simply varying their dimensions. Color tunability is combined with high emission efficiencies approaching 100 percent. These properties have recently become the basis of a new technology – quantum dot displays – employed, for example, in the newest generation of e-readers and video monitors.

  16. Tunable Quantum Dot Solids: Impact of Interparticle Interactions on Bulk

    Office of Scientific and Technical Information (OSTI)

    Properties (Technical Report) | SciTech Connect Tunable Quantum Dot Solids: Impact of Interparticle Interactions on Bulk Properties Citation Details In-Document Search Title: Tunable Quantum Dot Solids: Impact of Interparticle Interactions on Bulk Properties QD-solids comprising self-assembled semiconductor nanocrystals such as CdSe are currently under investigation for use in a wide array of applications including light emitting diodes, solar cells, field effect transistors, photodetectors,

  17. Magneto-optical absorption in semiconducting spherical quantum dots: Influence of the dot-size, confining potential, and magnetic field

    SciTech Connect

    Kushwaha, Manvir S.

    2014-12-15

    Semiconducting quantum dots – more fancifully dubbed artificial atoms – are quasi-zero dimensional, tiny, man-made systems with charge carriers completely confined in all three dimensions. The scientific quest behind the synthesis of quantum dots is to create and control future electronic and optical nanostructures engineered through tailoring size, shape, and composition. The complete confinement – or the lack of any degree of freedom for the electrons (and/or holes) – in quantum dots limits the exploration of spatially localized elementary excitations such as plasmons to direct rather than reciprocal space. Here we embark on a thorough investigation of the magneto-optical absorption in semiconducting spherical quantum dots characterized by a confining harmonic potential and an applied magnetic field in the symmetric gauge. This is done within the framework of Bohm-Pines’ random-phase approximation that enables us to derive and discuss the full Dyson equation that takes proper account of the Coulomb interactions. As an application of our theoretical strategy, we compute various single-particle and many-particle phenomena such as the Fock-Darwin spectrum; Fermi energy; magneto-optical transitions; probability distribution; and the magneto-optical absorption in the quantum dots. It is observed that the role of an applied magnetic field on the absorption spectrum is comparable to that of a confining potential. Increasing (decreasing) the strength of the magnetic field or the confining potential is found to be analogous to shrinking (expanding) the size of the quantum dots: resulting into a blue (red) shift in the absorption spectrum. The Fermi energy diminishes with both increasing magnetic-field and dot-size; and exhibits saw-tooth-like oscillations at large values of field or dot-size. Unlike laterally confined quantum dots, both (upper and lower) magneto-optical transitions survive even in the extreme instances. However, the intra-Landau level

  18. Scalable quantum computer architecture with coupled donor-quantum dot qubits

    SciTech Connect

    Schenkel, Thomas; Lo, Cheuk Chi; Weis, Christoph; Lyon, Stephen; Tyryshkin, Alexei; Bokor, Jeffrey

    2014-08-26

    A quantum bit computing architecture includes a plurality of single spin memory donor atoms embedded in a semiconductor layer, a plurality of quantum dots arranged with the semiconductor layer and aligned with the donor atoms, wherein a first voltage applied across at least one pair of the aligned quantum dot and donor atom controls a donor-quantum dot coupling. A method of performing quantum computing in a scalable architecture quantum computing apparatus includes arranging a pattern of single spin memory donor atoms in a semiconductor layer, forming a plurality of quantum dots arranged with the semiconductor layer and aligned with the donor atoms, applying a first voltage across at least one aligned pair of a quantum dot and donor atom to control a donor-quantum dot coupling, and applying a second voltage between one or more quantum dots to control a Heisenberg exchange J coupling between quantum dots and to cause transport of a single spin polarized electron between quantum dots.

  19. Effect of carrier dynamics and temperature on two-state lasing in semiconductor quantum dot lasers

    SciTech Connect

    Korenev, V. V. Savelyev, A. V.; Zhukov, A. E.; Omelchenko, A. V.; Maximov, M. V.

    2013-10-15

    It is analytically shown that the both the charge carrier dynamics in quantum dots and their capture into the quantum dots from the matrix material have a significant effect on two-state lasing phenomenon in quantum dot lasers. In particular, the consideration of desynchronization in electron and hole capture into quantum dots allows one to describe the quenching of ground-state lasing observed at high injection currents both qualitatevely and quantitatively. At the same time, an analysis of the charge carrier dynamics in a single quantum dot allowed us to describe the temperature dependences of the emission power via the ground- and excited-state optical transitions of quantum dots.

  20. The impact of quantum dot filling on dual-band optical transitions via intermediate quantum states

    SciTech Connect

    Wu, Jiang; Passmore, Brandon; Manasreh, M. O.

    2015-08-28

    InAs/GaAs quantum dot infrared photodetectors with different doping levels were investigated to understand the effect of quantum dot filling on both intraband and interband optical transitions. The electron filling of self-assembled InAs quantum dots was varied by direct doping of quantum dots with different concentrations. Photoresponse in the near infrared and middle wavelength infrared spectral region was observed from samples with low quantum dot filling. Although undoped quantum dots were favored for interband transitions with the absence of a second optical excitation in the near infrared region, doped quantum dots were preferred to improve intraband transitions in the middle wavelength infrared region. As a result, partial filling of quantum dot was required, to the extent of maintaining a low dark current, to enhance the dual-band photoresponse through the confined electron states.

  1. R&D Magazine: Windows into Solar Power Sources with Quantum Dots

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    R&D Magazine: Windows into Solar Power Sources with Quantum Dots R&D Magazine: Windows into Solar Power Sources with Quantum Dots A luminescent solar concentrator is an emerging ...

  2. R&D Magazine: Windows into Solar Power Sources with Quantum Dots

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    R&D Magazine: Windows into Solar Power Sources with Quantum Dots August 30, 2015 R&D Magazine: Windows into Solar Power Sources with Quantum Dots A luminescent solar concentrator ...

  3. New Los Alamos approach may be key to quantum dot solar cells...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Researchers have demonstrated an almost four-fold boost of the carrier multiplication yield with nanoengineered quantum dots. June 18, 2014 Coreshell PbSeCdSe quantum dots (a) ...

  4. BA capped CdSe quantum dot sensitized solar cell (Conference...

    Office of Scientific and Technical Information (OSTI)

    BA capped CdSe quantum dot sensitized solar cell Citation Details In-Document Search Title: BA capped CdSe quantum dot sensitized solar cell Authors: Sykora, Milan 1 ; Koposov, ...

  5. CdSe Quantum-Dot-Sensitized Solar Cell with ~100% Internal Quantum...

    Office of Scientific and Technical Information (OSTI)

    CdSe Quantum-Dot-Sensitized Solar Cell with 100% Internal Quantum Efficiency Citation Details In-Document Search Title: CdSe Quantum-Dot-Sensitized Solar Cell with 100% Internal ...

  6. Overview of DOE - DOT December 2009 CNG and Hydrogen Fuels Workshop...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    DOE - DOT December 2009 CNG and Hydrogen Fuels Workshop Overview of DOE - DOT December 2009 CNG and Hydrogen Fuels Workshop These slides were presented at the Onboard Storage Tank ...

  7. Thick-shell nanocrystal quantum dots (Patent) | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Title: Thick-shell nanocrystal quantum dots Colloidal nanocrystal quantum dots comprising an inner core having an average diameter of at least 1.5 nm and an outer shell, where said ...

  8. PbSe Quantum Dot Solar Cells with More than 6% Efficiency Fabricated...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: PbSe Quantum Dot Solar Cells with More than 6% Efficiency Fabricated in Ambient Atmosphere Citation Details In-Document Search Title: PbSe Quantum Dot Solar Cells ...

  9. Engineered CuInSexS2-x Quantum Dots for Sensitized Solar Cells...

    Office of Scientific and Technical Information (OSTI)

    Engineered CuInSexS2-x Quantum Dots for Sensitized Solar Cells Citation Details In-Document Search Title: Engineered CuInSexS2-x Quantum Dots for Sensitized Solar Cells Authors: ...

  10. Charge Generation in PbS Quantum Dot Solar Cells Characterized...

    Office of Scientific and Technical Information (OSTI)

    Dot Solar Cells Characterized by Temperature-Dependent Steady-State Photoluminescence Citation Details In-Document Search Title: Charge Generation in PbS Quantum Dot Solar Cells ...

  11. Surface Induced Magnetism in Quantum Dots

    SciTech Connect

    Meulenberg, R W; Lee, J I

    2009-08-20

    The study of nanometer sized semiconductor crystallites, also known as quantum dots (QDs), has seen rapid advancements in recent years in scientific disciplines ranging from chemistry, physics, biology, materials science, and engineering. QD materials of CdSe, ZnSe, InP, as well as many others, can be prepared in the size range of 1-10 nm producing uniform, nearly monodisperse materials that are typically coated with organic molecules [1-3]. The strength of charge carrier confinement, which dictates the size-dependent properties, in these QDs depends on the nature of the material and can be correlated to the Bohr radius for the system of interest. For instance, the Bohr radius for CdSe is {approx} 5 nm, while in the more covalent structure of InP, the Bohr radius approaches {approx} 10 nm. The study of CdSe QDs has been particularly extensive during the last decade because they exhibit unique and tunable optical properties and are readily synthesized with high-crystallinity and narrow size dispersions. Although the core electronic properties of CdSe are explained in terms of the quantum confinement model, experimental efforts to elucidate the surface structure of these materials have been limited. Typically, colloidal CdSe QDs are coated with an organic surfactant, which typically consists of an organo-phosphine, -thiol, or -amine, that has the function of energetically relaxing defect states via coordination to partially coordinated surface atoms. The organic surfactant also acts to enhance carrier confinement and prevent agglomeration of the particles. Chemically, it has been shown that the bonding of the surfactant to the CdSe QD occurs through Cd atoms resulting cleavage of the Se atoms and formation of a Cd-rich (i.e. non-stoichiometric) particle [5].

  12. Nonradiative recombination of excitons in semimagnetic quantum dots

    SciTech Connect

    Chernenko, A. V.

    2015-12-15

    The mechanisms of the nonradiative recombination of excitons in neutral and charged quantum dots based on II–VI semimagnetic semiconductors are investigated. It is shown that, along with the dipole–dipole and direct-exchange mechanisms, there is one more mechanism referred to as the indirect-exchange mechanism and related to sp–d mixing. The selection rules for nonradiative recombination by exchange mechanisms are subsequently derived. The dependence of the efficiency of all recombination mechanisms on the quantum-dot size is studied. The experimentally observed growth in the intracenter photoluminescence intensity with decreasing size of dots and nanocrystals is accounted for. Methods for experimental determination of the contributions of different mechanisms to nonradiative recombination are discussed.

  13. DOT-7A Type A packaging design guide

    SciTech Connect

    Kelly, D.L.

    1995-01-23

    The purpose of this Design Guide is to provide instruction for designing a U.S. Department of Transportation Specification 7A (DOT-7A) Type A packaging. Another purpose for this Design Guide is to support the evaluation and testing activities that are performed on new designs by a U.S. Department of Energy (DOE) test facility. This evaluation and testing program is called the DOT-7A Program. When an applicant has determined that a DOT-7A packaging is needed and not commercially available, a design may be created according to this document. The design should include a packaging drawing, specifications, analysis report, operating instructions, and a Packaging Qualification Checklist; all of which should be forwarded to a DOE/HQ approved test facility for evaluation and testing. This report is being submitted through the Engineering Documentation System so that it may be used for reference and information purposes.

  14. Out-of-Equilibrium Kondo Effect in Double Quantum Dots

    SciTech Connect

    Aguado, Ramon; Langreth, David C.

    2000-08-28

    The out-of-equilibrium transport properties of a double quantum dot system in the Kondo regime are studied theoretically by means of a two-impurity Anderson Hamiltonian with interimpurity hopping. The Hamiltonian is solved by means of a nonequilibrium generalization of the slave-boson mean-field theory. It is demonstrated that measurements of the differential conductance dI/dV , for appropriate values of voltages and tunneling couplings, can give a direct observation of the coherent superposition between the many-body Kondo states of each dot. For large voltages and arbitrarily large interdot tunneling, there is a critical voltage above which the physical behavior of the system again resembles that of two decoupled quantum dots. (c) 2000 The American Physical Society.

  15. Quasi-periodic quantum dot arrays produced by electrochemical synthesis

    SciTech Connect

    Bandyopadhyay, S.; Miller, A.E.; Yue, D.F.; Banerjee, G.; Ricker, R.E.; Jones, S.; Eastman, J.A.; Baugher, E.; Chandrasekhar, M.

    1994-06-01

    We discuss a ``gentle`` electrochemical technique for fabricating quasi-periodic quantum dot arrays. The technique exploits a self-organizing phenomenon to produce quasi-periodic arrangement of dots and provides excellent control over dot size and interdot spacing. Unlike conventional nanolithography, it does not cause radiation damage to the structures during exposure to pattern delineating beams (e-beam, ion-beam or x-ray). Moreover, it does not require harsh processing steps like reactive ion etching, offers a minimum feature size of {approximately}40 {angstrom}, allows the fabrication of structures on nonplanar surfaces (e.g. spherical or cylindrical substrates), is amenable to mass production (millions of wafers can be processed simultaneously) and is potentially orders of magnitude cheaper than conventional nanofabrication. In this paper, we describe our initial results and show the promise of this technique for low-cost and high-yield nanosynthesis.

  16. Operational guidance for using DOT-6M/2R packaging

    SciTech Connect

    Kelly, D.L.; Hummer, J.H.

    1994-03-01

    The purpose of this paper is to describe a new US Department of Energy (DOE), Transportation Management Division task to create a US Department of Transportation (DOT) Specification 6M/2R packaging configuration user`s guide. The need for a user`s guide was identified because the DOT-6M/2R packaging configuration is widely used by DOE site contractors, and DOE receives many questions about the approved packaging configurations. Currently, two DOE organizations have the authority to approve new DOT-6M/2R configurations. For Defense Programs, the Transportation and Packaging Safety Division (EH-332) administers the program. For Environmental Restoration and Waste Management, the Transportation Management Division (EM-261) administers the program.

  17. A prototype silicon double quantum dot with dispersive microwave readout

    SciTech Connect

    Schmidt, A. R. Henry, E.; Namaan, O.; Siddiqi, I.; Lo, C. C.; Wang, Y.-T.; Bokor, J.; Yablonovitch, E.; Li, H.; Greenman, L.; Whaley, K. B.; Schenkel, T.

    2014-07-28

    We present a unique design and fabrication process for a lateral, gate-confined double quantum dot in an accumulation mode metal-oxide-semiconductor (MOS) structure coupled to an integrated microwave resonator. All electrostatic gates for the double quantum dot are contained in a single metal layer, and use of the MOS structure allows for control of the location of the two-dimensional electron gas via the location of the accumulation gates. Numerical simulations of the electrostatic confinement potential are performed along with an estimate of the coupling of the double quantum dot to the microwave resonator. Prototype devices are fabricated and characterized by transport measurements of electron confinement and reflectometry measurements of the microwave resonator.

  18. Self-organized formation of quantum dots of a material on a substrate

    DOEpatents

    Zhang, Zhenyu; Wendelken, John F.; Chang, Ming-Che; Pai, Woei Wu

    2001-01-01

    Systems and methods are described for fabricating arrays of quantum dots. A method for making a quantum dot device, includes: forming clusters of atoms on a substrate; and charging the clusters of atoms such that the clusters of atoms repel one another. The systems and methods provide advantages because the quantum dots can be ordered with regard to spacing and/or size.

  19. Analysis of the efficiency of intermediate band solar cells based on quantum dot supercrystals

    SciTech Connect

    Heshmati, S; Golmohammadi, S; Abedi, K; Taleb, H

    2014-03-28

    We have studied the influence of the quantum-dot (QD) width and the quantum-dot conduction band (QD-CB) offset on the efficiency of quantum-dot intermediate band solar cells (QD-IBSCs). Simulation results demonstrate that with increasing QD-CB offset and decreasing QD width, the maximum efficiency is achieved. (laser applications and other topics in quantum electronics)

  20. Quantum-dot based nanothermometry in optical plasmonic recording media

    SciTech Connect

    Maestro, Laura Martinez; Zhang, Qiming; Li, Xiangping; Gu, Min; Jaque, Daniel

    2014-11-03

    We report on the direct experimental determination of the temperature increment caused by laser irradiation in a optical recording media constituted by a polymeric film in which gold nanorods have been incorporated. The incorporation of CdSe quantum dots in the recording media allowed for single beam thermal reading of the on-focus temperature from a simple analysis of the two-photon excited fluorescence of quantum dots. Experimental results have been compared with numerical simulations revealing an excellent agreement and opening a promising avenue for further understanding and optimization of optical writing processes and media.

  1. Optical control of the emission direction of a quantum dot

    SciTech Connect

    Luxmoore, I. J.; Wasley, N. A.; Fox, A. M.; Skolnick, M. S.; Ramsay, A. J.; Thijssen, A. C. T.; Oulton, R.; Hugues, M.; CNRS-CRHEA, rue Bernard Grgory, 06560 Valbonne

    2013-12-09

    Using the helicity of a non-resonant excitation laser, control over the emission direction of an InAs/GaAs quantum dot is demonstrated. The quantum dot is located off-center in a crossed-waveguide structure, such that photons of opposite circular polarization are emitted into opposite waveguide directions. By preferentially exciting spin-polarized excitons, the direction of emission can therefore be controlled. The directional control is quantified by using the ratio of the intensity of the light coupled into the two waveguides, which reaches a maximum of 35%.

  2. Fast gain and phase recovery of semiconductor optical amplifiers based on submonolayer quantum dots

    SciTech Connect

    Herzog, Bastian Owschimikow, Nina; Kaptan, Yücel; Kolarczik, Mirco; Switaiski, Thomas; Woggon, Ulrike; Schulze, Jan-Hindrik; Rosales, Ricardo; Strittmatter, André; Bimberg, Dieter; Pohl, Udo W.

    2015-11-16

    Submonolayer quantum dots as active medium in opto-electronic devices promise to combine the high density of states of quantum wells with the fast recovery dynamics of self-assembled quantum dots. We investigate the gain and phase recovery dynamics of a semiconductor optical amplifier based on InAs submonolayer quantum dots in the regime of linear operation by one- and two-color heterodyne pump-probe spectroscopy. We find an as fast recovery dynamics as for quantum dot-in-a-well structures, reaching 2 ps at moderate injection currents. The effective quantum well embedding the submonolayer quantum dots acts as a fast and efficient carrier reservoir.

  3. Few-hole double quantum dot in an undoped GaAs/AlGaAs heterostructure

    SciTech Connect

    Tracy, L. A.; Hargett, T. W.; Reno, J. L.

    2014-03-24

    We demonstrate a hole double quantum dot in an undoped GaAs/AlGaAs heterostructure. The interdot coupling can be tuned over a wide range, from formation of a large single dot to two well-isolated quantum dots. Using charge sensing, we show the ability to completely empty the dot of holes and control the charge occupation in the few-hole regime. The device should allow for control of individual hole spins in single and double quantum dots in GaAs.

  4. Increased InAs quantum dot size and density using bismuth as a surfactant

    SciTech Connect

    Dasika, Vaishno D.; Krivoy, E. M.; Nair, H. P.; Maddox, S. J.; Park, K. W.; Yu, E. T.; Bank, S. R.; Jung, D.; Lee, M. L.

    2014-12-22

    We have investigated the growth of self-assembled InAs quantum dots using bismuth as a surfactant to control the dot size and density. We find that the bismuth surfactant increases the quantum dot density, size, and uniformity, enabling the extension of the emission wavelength with increasing InAs deposition without a concomitant reduction in dot density. We show that these effects are due to bismuth acting as a reactive surfactant to kinetically suppress the surface adatom mobility. This mechanism for controlling quantum dot density and size has the potential to extend the operating wavelength and enhance the performance of various optoelectronic devices.

  5. Structure of droplet-epitaxy-grown InAs/GaAs quantum dots

    SciTech Connect

    Cohen, Eyal; Yochelis, Shira; Westreich, Ohad; Shusterman, Sergey; Kumah, Divine P.; Clarke, Roy; Yacoby, Yizhak; Paltiel, Yossi

    2011-09-06

    We have used a direct x-ray phasing method, coherent Bragg rod analysis, to obtain sub-angstrom resolution electron density maps of the InAs/GaAs dot system. The dots were grown by the droplet heteroepitaxy (DHE) technique and their structural and compositional properties are compared with those of dots grown by the strain-driven Stranski-Krastanov method. Our results show that the Ga diffusion into the DHE-grown dots is somewhat larger; however, other characteristics such as the composition of the dots uppermost layers, the interlayer spacing, and the bowing of the atomic layers are similar.

  6. Height control of self-assembled quantum dots by strain engineering during capping

    SciTech Connect

    Grossi, D. F. Koenraad, P. M.; Smereka, P.; Keizer, J. G.; Ulloa, J. M.

    2014-10-06

    Strain engineering during the capping of III-V quantum dots has been explored as a means to control the height of strained self-assembled quantum dots. Results of Kinetic Monte Carlo simulations are confronted with cross-sectional Scanning Tunnel Microscopy (STM) measurements performed on InAs quantum dots grown by molecular beam epitaxy. We studied InAs quantum dots that are capped by In{sub x}Ga{sub (1−x)}As layers of different indium compositions. Both from our realistic 3D kinetic Monte Carlo simulations and the X-STM measurements on real samples, a trend in the height of the capped quantum dot is found as a function of the lattice mismatch between the quantum dot material and the capping layer. Results obtained on additional material combinations show a generic role of the elastic energy in the control of the quantum dot morphology by strain engineering during capping.

  7. Suppression of low-frequency charge noise in gates-defined GaAs quantum dots

    SciTech Connect

    You, Jie; Li, Hai-Ou E-mail: gpguo@ustc.edu.cn; Wang, Ke; Cao, Gang; Song, Xiang-Xiang; Xiao, Ming; Guo, Guo-Ping E-mail: gpguo@ustc.edu.cn

    2015-12-07

    To reduce the charge noise of a modulation-doped GaAs/AlGaAs quantum dot, we have fabricated shallow-etched GaAs/AlGaAs quantum dots using the wet-etching method to study the effects of two-dimensional electron gas (2DEG) underneath the metallic gates. The low-frequency 1/f noise in the Coulomb blockade region of the shallow-etched quantum dot is compared with a non-etched quantum dot on the same wafer. The average values of the gate noise are approximately 0.5 μeV in the shallow-etched quantum dot and 3 μeV in the regular quantum dot. Our results show the quantum dot low-frequency charge noise can be suppressed by the removal of the 2DEG underneath the metallic gates, which provides an architecture for noise reduction.

  8. Intermediate-band photosensitive device with quantum dots having tunneling barrier embedded in organic matrix

    DOEpatents

    Forrest, Stephen R.

    2008-08-19

    A plurality of quantum dots each have a shell. The quantum dots are embedded in an organic matrix. At least the quantum dots and the organic matrix are photoconductive semiconductors. The shell of each quantum dot is arranged as a tunneling barrier to require a charge carrier (an electron or a hole) at a base of the tunneling barrier in the organic matrix to perform quantum mechanical tunneling to reach the respective quantum dot. A first quantum state in each quantum dot is between a lowest unoccupied molecular orbital (LUMO) and a highest occupied molecular orbital (HOMO) of the organic matrix. Wave functions of the first quantum state of the plurality of quantum dots may overlap to form an intermediate band.

  9. Approaches to Future Generation Photovoltaics and Solar Fuels: Quantum Dots, Arrays, and Quantum Dot Solar Cells

    SciTech Connect

    Semonin, O.; Luther, J.; Beard, M.; Johnson, J.; Gao, J.; Nozik, A.

    2012-01-01

    One potential, long-term approach to more efficient and lower cost future generation solar cells for solar electricity and solar fuels is to utilize the unique properties of quantum dots (QDs) to control the relaxation pathways of excited states to enhance multiple exciton generation (MEG). We have studied MEG in close-packed PbSe QD arrays where the QDs are electronically coupled in the films and thus exhibit good transport while still maintaining quantization and MEG. We have developed simple, all-inorganic solution-processable QD solar cells that produce large short-circuit photocurrents and power conversion efficiencies above 5% via nanocrystalline p-n junctions. These solar cells show QYs for photocurrent that exceed 100% in the photon energy regions where MEG is possible; the photocurrent MEG QYs as a function of photon energy match those determined via time-resolved spectroscopy Recent analyses of the major effect of MEG combined with solar concentration on the conversion efficiency of solar cells will also be discussed.

  10. Fabrication and optical properties of multishell InAs quantum dots on GaAs nanowires

    SciTech Connect

    Yan, Xin; Zhang, Xia Li, Junshuai; Cui, Jiangong; Ren, Xiaomin

    2015-02-07

    Hybrid nanostructures combining nanowires with quantum dots promote the development of nanoelectronic and nanophotonic devices with integrated functionalities. In this work, we present a complex nanostructure with multishell quantum dots grown on nanowires. 1–4 shells of Stranski-Krastanov InAs quantum dots are grown on the sidewalls of GaAs nanowires by metal organic chemical vapor deposition. Different dot shells are separated by 8 nm GaAs spacer shells. With increasing the number of shells, the quantum dots become sparser and tend to align in one array, which is caused by the shrinkage of facets on which dots prefer to grow as well as the strain fields produced by the lower set of dots which influences the migration of In adatoms. The size of quantum dots increases with the increase of shell number due to enhanced strain fields coupling. The spectra of multishell dots exhibit multiwavelength emission, and each peak corresponds to a dot shell. This hybrid structure may serve as a promising element in nanowire intermediate band solar cells, infrared nanolasers, and photodetectors.

  11. Simulation of quantum dots size and spacing effect for intermediate band solar cell application based on InAs quantum dots arrangement in GaAs

    SciTech Connect

    Hendra, P. I. B. Rahayu, F. Darma, Y.

    2014-03-24

    Intermediate band solar cell (IBSC) has become a promising technology in increasing solar cell efficiency. In this work we compare absorption coefficient profile between InAs quantum dots with GaAs bulk. We calculate the efficiency of GaAs bulk and GaAs doped with 2, 5, and 10 nm InAs quantum dot. Effective distances in quantum dot arrangement based on electron tunneling consideration were also calculated. We presented a simple calculation method with low computing power demand. Results showed that arrangement of quantum dot InAs in GaAs can increase solar cell efficiency from 23.9 % initially up to 60.4%. The effective distance between two quantum dots was found 2 nm in order to give adequate distance to prevent electron tunneling and wave functions overlap.

  12. Facile synthesis and photoluminescence mechanism of graphene quantum dots

    SciTech Connect

    Yang, Ping; Zhou, Ligang; Zhang, Shenli; Pan, Wei Shen, Wenzhong; Wan, Neng

    2014-12-28

    We report a facile hydrothermal synthesis of intrinsic fluorescent graphene quantum dots (GQDs) with two-dimensional morphology. This synthesis uses glucose, concentrate sulfuric acid, and deionized water as reagents. Concentrated sulfuric acid is found to play a key role in controlling the transformation of as-prepared hydrothermal products from amorphous carbon nanodots to well-crystallized GQDs. These GQDs show typical absorption characteristic for graphene, and have nearly excitation-independent ultraviolet and blue intrinsic emissions. Temperature-dependent PL measurements have demonstrated strong electron-electron scattering and electron-phonon interactions, suggesting a similar temperature behavior of GQDs to inorganic semiconductor quantum dots. According to optical studies, the ultraviolet emission is found to originate from the recombination of electron-hole pairs localized in the C=C bonds, while the blue emission is from the electron transition of sp{sup 2} domains.

  13. Resonant scattering of surface plasmon polaritons by dressed quantum dots

    SciTech Connect

    Huang, Danhong; Cardimona, Dave; Easter, Michelle; Gumbs, Godfrey; Maradudin, A. A.; Lin, Shawn-Yu; Zhang, Xiang

    2014-06-23

    The resonant scattering of surface plasmon-polariton waves (SPP) by embedded semiconductor quantum dots above the dielectric/metal interface is explored in the strong-coupling regime. In contrast to non-resonant scattering by a localized dielectric surface defect, a strong resonant peak in the spectrum of the scattered field is predicted that is accompanied by two side valleys. The peak height depends nonlinearly on the amplitude of SPP waves, reflecting the feedback dynamics from a photon-dressed electron-hole plasma inside the quantum dots. This unique behavior in the scattered field peak strength is correlated with the occurrence of a resonant dip in the absorption spectrum of SPP waves due to the interband photon-dressing effect. Our result on the scattering of SPP waves may be experimentally observable and applied to spatially selective illumination and imaging of individual molecules.

  14. Optical, electronic, and structural properties of uncoupled and close-packed arrays of InP quantum dots

    SciTech Connect

    Micic, O.I.; Jones, K.M.; Cahill, A.; Nozik, A.J.

    1998-12-03

    Solid films consisting of close-packed arrays of InP quantum dots have been prepared by slowly evaporating colloidal solutions of InP quantum dots. The diameters of the quantum dots were controlled to be between about 30 to 60 {angstrom}; size-selective precipitation yielded a size distribution of about 10% about the mean diameter. The arrays show regions of hexagonal order, as well as disordered regions. Oxide layers can form irreversibly on the quantum dot surface and limit the effectiveness of the size-selective precipitation. Photoluminescence spectra obtained from close-packed films of InP quantum dots formed from quantum dots with a single mean diameter and from a mixture of two quantum dot sizes show that energy transfer occurs from the photoexcited smaller quantum dots to the larger quantum dots. The efficiency of this energy transfer process is high.

  15. Computational models for the berry phase in semiconductor quantum dots

    SciTech Connect

    Prabhakar, S. Melnik, R. V. N.; Sebetci, A.

    2014-10-06

    By developing a new model and its finite element implementation, we analyze the Berry phase low-dimensional semiconductor nanostructures, focusing on quantum dots (QDs). In particular, we solve the Schrdinger equation and investigate the evolution of the spin dynamics during the adiabatic transport of the QDs in the 2D plane along circular trajectory. Based on this study, we reveal that the Berry phase is highly sensitive to the Rashba and Dresselhaus spin-orbit lengths.

  16. QCAD simulation and optimization of semiconductor double quantum dots

    SciTech Connect

    Nielsen, Erik; Gao, Xujiao; Kalashnikova, Irina; Muller, Richard Partain; Salinger, Andrew Gerhard; Young, Ralph Watson

    2013-12-01

    We present the Quantum Computer Aided Design (QCAD) simulator that targets modeling quantum devices, particularly silicon double quantum dots (DQDs) developed for quantum qubits. The simulator has three di erentiating features: (i) its core contains nonlinear Poisson, e ective mass Schrodinger, and Con guration Interaction solvers that have massively parallel capability for high simulation throughput, and can be run individually or combined self-consistently for 1D/2D/3D quantum devices; (ii) the core solvers show superior convergence even at near-zero-Kelvin temperatures, which is critical for modeling quantum computing devices; (iii) it couples with an optimization engine Dakota that enables optimization of gate voltages in DQDs for multiple desired targets. The Poisson solver includes Maxwell- Boltzmann and Fermi-Dirac statistics, supports Dirichlet, Neumann, interface charge, and Robin boundary conditions, and includes the e ect of dopant incomplete ionization. The solver has shown robust nonlinear convergence even in the milli-Kelvin temperature range, and has been extensively used to quickly obtain the semiclassical electrostatic potential in DQD devices. The self-consistent Schrodinger-Poisson solver has achieved robust and monotonic convergence behavior for 1D/2D/3D quantum devices at very low temperatures by using a predictor-correct iteration scheme. The QCAD simulator enables the calculation of dot-to-gate capacitances, and comparison with experiment and between solvers. It is observed that computed capacitances are in the right ballpark when compared to experiment, and quantum con nement increases capacitance when the number of electrons is xed in a quantum dot. In addition, the coupling of QCAD with Dakota allows to rapidly identify which device layouts are more likely leading to few-electron quantum dots. Very efficient QCAD simulations on a large number of fabricated and proposed Si DQDs have made it possible to provide fast feedback for design

  17. Exploring Competing Kinetic Processes in Quantum Dots Linked to Electrode

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Surfaces | MIT-Harvard Center for Excitonics Competing Kinetic Processes in Quantum Dots Linked to Electrode Surfaces March 14, 2012 at 2:30pm/4-349 Mark Hybertsen Brookhaven National Laboratory, Columbia University Mark_Hybertsen001_000 Abstract: Exploiting the unique properties of nanostructured chromophores for light harvesting applications relies on the balance between competing kinetic processes including energy transfer, carrier relaxation and carrier tunneling. In the first part of

  18. Excited-state spectroscopy of InP quantum dots

    SciTech Connect

    Bertram, D.; Micic, O.I.; Nozik, A.J.

    1998-02-01

    We have measured low-temperature size-selective photoluminescence excitation spectra of high-quality InP quantum dots prepared by collodial chemistry. A set of samples with mean emission energies in the range from 1.9 to 2.2 eV was investigated. All samples have a size distribution of about 10{percent}, resulting in an inhomogeneously broadened photoluminescence lineshape. Due to the finite size distribution, spectra were collected at different detection wavelengths to reveal the energies of the excited excitonic states. The size dependence of the quantization energies of InP nanoparticles was determined by measuring photoluminescence excitation at different detection energies within one sample. Up to eight excited-state transitions in a set of seven samples were observed, as the estimated quantum dot size was scanned from 1.8 to 4.0 nm. A comparison of the observed peaks with a six-band {bold k}{center_dot}{bold p} calculation is given. In contrast to the successful interpretation in the case of CdSe, no agreement between the calculated and the observed excited-state energies is achieved. {copyright} {ital 1998} {ital The American Physical Society}

  19. A reconfigurable gate architecture for Si/SiGe quantum dots

    SciTech Connect

    Zajac, D. M.; Hazard, T. M.; Mi, X.; Wang, K.; Petta, J. R.

    2015-06-01

    We demonstrate a reconfigurable quantum dot gate architecture that incorporates two interchangeable transport channels. One channel is used to form quantum dots, and the other is used for charge sensing. The quantum dot transport channel can support either a single or a double quantum dot. We demonstrate few-electron occupation in a single quantum dot and extract charging energies as large as 6.6 meV. Magnetospectroscopy is used to measure valley splittings in the range of 35–70 μeV. By energizing two additional gates, we form a few-electron double quantum dot and demonstrate tunable tunnel coupling at the (1,0) to (0,1) interdot charge transition.

  20. Density functional calculation of the structural and electronic properties of germanium quantum dots

    SciTech Connect

    Anas, M. M.; Gopir, G.

    2015-04-24

    We apply first principles density functional computational methods to study the structures, densities of states (DOS), and higher occupied molecular orbital (HOMO) – lowest unoccupied molecular orbital (LUMO) gaps of selected free-standing Ge semiconductor quantum dots up to 1.8nm. Our calculations are performed using numerical atomic orbital approach where linear combination of atomic orbital was applied. The surfaces of the quantum dots was passivized by hydrogen atoms. We find that surface passivation does affect the electronic properties associated with the changes of surface state, electron localization, and the energy gaps of germanium nanocrystals as well as the confinement of electrons inside the quantum dots (QDs). Our study shows that the energy gaps of germanium quantum dots decreases with the increasing dot diameter. The size-dependent variations of the computed HOMO-LUMO gaps in our quantum dots model were found to be consistent with the effects of quantum confinement reported in others theoretical and experimental calculation.

  1. Fabrication and evaluation of series-triple quantum dots by thermal oxidation of silicon nanowire

    SciTech Connect

    Uchida, Takafumi Jo, Mingyu; Tsurumaki-Fukuchi, Atsushi; Arita, Masashi; Takahashi, Yasuo; Fujiwara, Akira

    2015-11-15

    Series-connected triple quantum dots were fabricated by a simple two-step oxidation technique using the pattern-dependent oxidation of a silicon nanowire and an additional oxidation of the nanowire through the gap of the fine gates attached to the nanowire. The characteristics of multi-dot single-electron devices are obtained. The formation of each quantum dot beneath an attached gate is confirmed by analyzing the electrical characteristics and by evaluating the gate capacitances between all pairings of gates and quantum dots. Because the gate electrode is automatically attached to each dot, the device structure benefits from scalability. This technique promises integrability of multiple quantum dots with individual control gates.

  2. Antimony mediated growth of high-density InAs quantum dots for photovoltaic cells

    SciTech Connect

    Tutu, F. K.; Wu, J.; Lam, P.; Tang, M.; Liu, H.; Miyashita, N.; Okada, Y.; Wilson, J.; Allison, R.

    2013-07-22

    We report enhanced solar cell performance using high-density InAs quantum dots. The high-density quantum dot was grown by antimony mediated molecular beam epitaxy. In-plane quantum dot density over 1 × 10{sup 11} cm{sup −2} was achieved by applying a few monolayers of antimony on the GaAs surface prior to quantum dot growth. The formation of defective large clusters was reduced by optimization of the growth temperature and InAs coverage. Comparing with a standard quantum dot solar cell without the incorporation of antimony, the high-density quantum dot solar cell demonstrates a distinct improvement in short-circuit current from 7.4 mA/cm{sup 2} to 8.3 mA/cm{sup 2}.

  3. The emission wavelength dependent photoluminescence lifetime of the N-doped graphene quantum dots

    SciTech Connect

    Deng, Xingxia; Sun, Jing; Yang, Siwei; Ding, Guqiao; Shen, Hao; Zhou, Wei; Lu, Jian; Wang, Zhongyang

    2015-12-14

    Aromatic nitrogen doped graphene quantum dots were investigated by steady-state and time-resolved photoluminescence (PL) techniques. The PL lifetime was found to be dependent on the emission wavelength and coincident with the PL spectrum, which is different from most semiconductor quantum dots and fluorescent dyes. This result shows the synergy and competition between the quantum confinement effect and edge functional groups, which may have the potential to guide the synthesis and expand the applications of graphene quantum dots.

  4. Quantum-dot solar windows evolve with 'doctor-blade' spreading

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Quantum-dot solar windows evolve with 'doctor-blade' spreading Quantum-dot solar windows evolve with 'doctor-blade' spreading A Los Alamos National Laboratory research team demonstrates an important step in taking quantum dot, solar-powered windows from the laboratory to the construction site. October 11, 2016 Los Alamos Center for Advanced Solar Photophysics researchers hold a large prototype solar window. From left to right: Jaehoon Lim, Kaifeng Wu, Victor Klimov, Hongbo Li. Los Alamos Center

  5. Quantum-dot solar windows evolve with 'doctor-blade' spreading

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Quantum-dot solar windows evolve with 'doctor-blade' spreading At the Bradbury Latest Issue:November 2016 all issues All Issues » submit Quantum-dot solar windows evolve with 'doctor-blade' spreading A Los Alamos National Laboratory research team demonstrates an important step in taking quantum dot, solar-powered windows from the laboratory to the construction site. November 1, 2016 Los Alamos Center for Advanced Solar Photophysics researchers hold a large prototype solar window. From left to

  6. Formation of long-range ordered quantum dots arrays in amorphous matrix by ion beam irradiation

    SciTech Connect

    Buljan, M.; Bogdanovic-Radovic, I.; Karlusic, M.; Desnica, U. V.; Radic, N.; Dubcek, P.; Drazic, G.; Salamon, K.; Bernstorff, S.; Holy, V.

    2009-08-10

    We demonstrate the production of a well ordered three-dimensional array of Ge quantum dots in amorphous silica matrix. The ordering is achieved by ion beam irradiation and annealing of a multilayer film. Structural analysis shows that quantum dots nucleate along the direction of the ion beam used for irradiation, while the mutual distance of the quantum dots is determined by the diffusion properties of the multilayer material rather than the distances between traces of ions that are used for irradiation.

  7. Coupling single giant nanocrystal quantum dots to the fundamental mode of

    Office of Scientific and Technical Information (OSTI)

    patch nanoantennas through fringe field (Journal Article) | SciTech Connect Coupling single giant nanocrystal quantum dots to the fundamental mode of patch nanoantennas through fringe field Citation Details In-Document Search Title: Coupling single giant nanocrystal quantum dots to the fundamental mode of patch nanoantennas through fringe field Through single dot spectroscopy and numerical simulation studies, we demonstrate that the fundamental mode of gold patch nanoantennas have

  8. NREL Certifies First All-Quantum-Dot Photovoltaic Cell; Demonstrates Stability, Performance (Fact Sheet)

    SciTech Connect

    Not Available

    2011-02-01

    Researchers at the National Renewable Energy Laboratory (NREL) have certified the first all-quantum-dot photovoltaic cell, which was based on lead sulfide and demonstrated reasonable quantum dot solar cell performance for an initial efficiency measurement along with good stability. The certified open-circuit voltage of the quantum dot cell is greater than that possible from bulk lead sulfide because of quantum confinement.

  9. Excited-State Relaxation in PbSe Quantum Dots

    SciTech Connect

    An, J. M.; Califano, M.; Franceschetti, A.; Zunger, A.

    2008-01-01

    In solids the phonon-assisted, nonradiative decay from high-energy electronic excited states to low-energy electronic excited states is picosecond fast. It was hoped that electron and hole relaxation could be slowed down in quantum dots, due to the unavailability of phonons energy matched to the large energy-level spacings ('phonon-bottleneck'). However, excited-state relaxation was observed to be rather fast ({le}1 ps) in InP, CdSe, and ZnO dots, and explained by an efficient Auger mechanism, whereby the excess energy of electrons is nonradiatively transferred to holes, which can then rapidly decay by phonon emission, by virtue of the densely spaced valence-band levels. The recent emergence of PbSe as a novel quantum-dot material has rekindled the hope for a slow down of excited-state relaxation because hole relaxation was deemed to be ineffective on account of the widely spaced hole levels. The assumption of sparse hole energy levels in PbSe was based on an effective-mass argument based on the light effective mass of the hole. Surprisingly, fast intraband relaxation times of 1-7 ps were observed in PbSe quantum dots and have been considered contradictory with the Auger cooling mechanism because of the assumed sparsity of the hole energy levels. Our pseudopotential calculations, however, do not support the scenario of sparse hole levels in PbSe: Because of the existence of three valence-band maxima in the bulk PbSe band structure, hole energy levels are densely spaced, in contradiction with simple effective-mass models. The remaining question is whether the Auger decay channel is sufficiently fast to account for the fast intraband relaxation. Using the atomistic pseudopotential wave functions of Pb{sub 2046}Se{sub 2117} and Pb{sub 260}Se{sub 249} quantum dots, we explicitly calculated the electron-hole Coulomb integrals and the P {yields} S electron Auger relaxation rate. We find that the Auger mechanism can explain the experimentally observed P {yields} S

  10. Charging dynamics of a floating gate transistor with site-controlled quantum dots

    SciTech Connect

    Maier, P. Hartmann, F.; Emmerling, M.; Schneider, C.; Höfling, S.; Kamp, M.; Worschech, L.

    2014-08-04

    A quantum dot memory based on a GaAs/AlGaAs quantum wire with site-controlled InAs quantum dots was realized by means of molecular beam epitaxy and etching techniques. By sampling of different gate voltage sweeps for the determination of charging and discharging thresholds, it was found that discharging takes place at short time scales of μs, whereas several seconds of waiting times within a distinct negative gate voltage range were needed to charge the quantum dots. Such quantum dot structures have thus the potential to implement logic functions comprising charge and time dependent ingredients such as counting of signals or learning rules.

  11. Red shift in the photoluminescence of colloidal carbon quantum dots induced by photon reabsorption

    SciTech Connect

    Zhang, Wenxia; Dai, Dejian; Chen, Xifang; Guo, Xiaoxiao; Fan, Jiyang

    2014-03-03

    We synthesize the colloidal carbon/graphene quantum dots 1–9 nm in diameter and study their photoluminescence properties. Surprisingly, the luminescence properties of a fixed collection of colloidal carbon quantum dots can be systematically changed as the concentration varies. A model based on photon reabsorption is proposed which explains well the experiment. Infrared spectral study indicates that the surfaces of the carbon quantum dots are substantially terminated by oxygen atoms, which causes their ultra-high hydrophilicity. Our result clarifies the mystery of distinct emission colors in carbon quantum dots and indicates that photon reabsorption can strongly affect the luminescence properties of colloidal nanocrystals.

  12. Quantum transport through the system of parallel quantum dots with Majorana bound states

    SciTech Connect

    Wang, Ning; Li, Yuxian; Lv, Shuhui

    2014-02-28

    We study the tunneling transport properties through a system of parallel quantum dots which are coupled to Majorana bound states (MBSs). The conductance and spectral function are computed using the retarded Green's function method based on the equation of motion. The conductance of the system is 2e{sup 2}/h at zero Fermi energy and is robust against the coupling between the MBSs and the quantum dots. The dependence of the Fermi energy on the spectral function is different for the first dot (dot1) than for the second dot (dot2) with fixed dot2-MBSs coupling. The influence of the Majorana bound states on the spectral function was studied for the series and parallel configurations of the system. It was found that when the configuration is in series, the Majorana bound states play an important role, resulting in a spectral function with three peaks. However, the spectral function shows two peaks when the system is in a parallel configuration. The zero Fermi energy spectral function is always 1/2 not only in series but also in the parallel configuration and robust against the coupling between the MBSs and the quantum dots. The phase diagram of the Fermi energy versus the quantum dot energy levels was also investigated.

  13. Improvement of plasmonic enhancement of quantum dot emission via an intermediate silicon-aluminum oxide interface

    SciTech Connect

    Wing, Waylin J.; Sadeghi, Seyed M. Campbell, Quinn

    2015-01-05

    We studied the emission of quantum dots in the presence of plasmon-metal oxide substrates, which consist of arrays of metallic nanorods embedded in amorphous silicon coated with a nanometer-thin layer of aluminum oxide on the top. We showed that the combined effects of plasmons and the silicon-aluminum oxide interface can lead to significant enhancement of the quantum efficiency of quantum dots. Our results show that such an interface can significantly enhance plasmonic effects of the nanorods via quantum dot-induced exciton-plasmon coupling, leading to partial polarization of the quantum dots' emission.

  14. R&D Magazine: Windows into Solar Power Sources with Quantum Dots

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    R&D Magazine: Windows into Solar Power Sources with Quantum Dots A luminescent solar concentrator is an emerging sunlight harvesting technology that has the potential to disrupt ...

  15. Giant Nanocrystal Quantum Dots as Stable and Efficient Down-Conversion...

    Office of Scientific and Technical Information (OSTI)

    State Lighting Citation Details In-Document Search Title: Giant Nanocrystal Quantum Dots as Stable and Efficient Down-Conversion Phosphor for LED based Solid State Lighting You ...

  16. Cornell dots research collaboration leads to $10M cancer center > EMC2 News

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    > The Energy Materials Center at Cornell dots research collaboration leads to $10M cancer center September 24th, 2015 › Provided/Wiesner Lab A rendering of the molecular structure of a Cornell dot, which is smaller than 10 nanometers. Provided/Wiesner Lab A transmission electron microscope image of Cornell dots. C dots, which are injected into patients, are designed to either adhere to and light up cancer cells or quickly leave the body. Cornell University, in partnership with Memorial

  17. In the OSTI Collections: Quantum Dots | OSTI, US Dept of Energy...

    Office of Scientific and Technical Information (OSTI)

    ... Strongly Coupled Quantum Dot Solids"SciTech Connect, in which electrical noise, and the effects on electrical conductivity of magnetic fields and chemical modifications, were ...

  18. Giant Nanocrystal Quantum Dots as Stable and Efficient Down-Conversion

    Office of Scientific and Technical Information (OSTI)

    Dots as Stable and Efficient Down-Conversion Phosphor for LED based Solid State Lighting Kundu, Janardan Los Alamos National Laboratory; Ghosh, Yagnaseni Los Alamos...

  19. UltraDots Inc formely UltraPhotonics | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    ) Place: Fremont, California Zip: CA 94539 Product: Nanotechnology company developing "quantum dot" technology for a range of energy, communications and medical applications....

  20. Quantum-dot solar windows evolve with 'doctor-blade' spreading

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Quantum-dot solar windows evolve with 'doctor-blade' spreading Quantum-dot solar windows evolve with 'doctor-blade' spreading Los Alamos scientists report on large LSC windows created using the "doctor-blade" technique for depositing thin layers of a dot/polymer composite on top of commercial large-area glass slab. November 4, 2016 Quantum-dot solar windows evolve with 'doctor-blade' spreading Los Alamos Center for Advanced Solar Photophysics researchers hold a large prototype solar

  1. Quantum Dots Promise to Significantly Boost Photovoltaic Efficiencies; The Spectrum of Clean Energy Innovation (Fact Sheet)

    SciTech Connect

    Not Available

    2010-06-01

    Fact sheet describing NREL's discovery that quantum dots--semiconductor nanocrystals--can dramatically increase the efficiency of converting sunlight to electricity.

  2. Observation of the Kondo effect in a spin-3/2 hole quantum dot (Journal

    Office of Scientific and Technical Information (OSTI)

    Article) | SciTech Connect Observation of the Kondo effect in a spin-3/2 hole quantum dot Citation Details In-Document Search Title: Observation of the Kondo effect in a spin-3/2 hole quantum dot We report the observation of the Kondo effect in a spin-3/2 hole quantum dot formed near pinch-off in a GaAs quantum wire. We clearly observe two distinctive hallmarks of quantum dot Kondo physics. First, the zero-bias peak in the differential conductance splits an in-plane magnetic field and the

  3. Grazing-incidence small-angle X-ray scattering: application to the study of quantum dot lattices

    SciTech Connect

    Buljan, Maja Radi?, Nikola; Bernstorff, Sigrid; Drai?, Goran; Bogdanovi?-Radovi?, Iva; Hol, Vclav

    2012-01-01

    The modelling of grazing-incidence small-angle X-ray scattering (GISAXS) from three-dimensional quantum dot lattices is described. The ordering of quantum dots in three-dimensional quantum dot lattices is investigated by grazing-incidence small-angle X-ray scattering (GISAXS). Theoretical models describing GISAXS intensity distributions for three general classes of lattices of quantum dots are proposed. The classes differ in the type of disorder of the positions of the quantum dots. The models enable full structure determination, including lattice type, lattice parameters, the type and degree of disorder in the quantum dot positions and the distributions of the quantum dot sizes. Applications of the developed models are demonstrated using experimentally measured data from several types of quantum dot lattices formed by a self-assembly process.

  4. Negative circular polarization as a universal property of quantum dots

    SciTech Connect

    Taylor, Matthew W.; Spencer, Peter; Murray, Ray

    2015-03-23

    This paper shows that negative circular polarization, a spin flip of polarized carriers resulting in emission of opposite helicity, can be observed in undoped, n-doped, and p-doped InAs/GaAs quantum dots. These results contradict the usual interpretation of the effect. We show using power dependent and time resolved spectroscopy that the generation of negative circular polarization correlates with excited state emission. Furthermore, a longer spin lifetime of negatively polarized excitons is observed where emission is largely ground state in character.

  5. A nonlinear Bloch model for Coulomb interaction in quantum dots

    SciTech Connect

    Bidegaray-Fesquet, Brigitte Keita, Kole

    2014-02-15

    In this paper, we first derive a Coulomb Hamiltonian for electron–electron interaction in quantum dots in the Heisenberg picture. Then we use this Hamiltonian to enhance a Bloch model, which happens to be nonlinear in the density matrix. The coupling with Maxwell equations in case of interaction with an electromagnetic field is also considered from the Cauchy problem point of view. The study is completed by numerical results and a discussion about the advisability of neglecting intra-band coherences, as is done in part of the literature.

  6. Computational modeling of electrophotonics nanomaterials: Tunneling in double quantum dots

    SciTech Connect

    Vlahovic, Branislav Filikhin, Igor

    2014-10-06

    Single electron localization and tunneling in double quantum dots (DQD) and rings (DQR) and in particular the localized-delocalized states and their spectral distributions are considered in dependence on the geometry of the DQDs (DQRs). The effect of violation of symmetry of DQDs geometry on the tunneling is studied in details. The cases of regular and chaotic geometries are considered. It will be shown that a small violation of symmetry drastically affects localization of electron and that anti-crossing of the levels is the mechanism of tunneling between the localized and delocalized states in DQRs.

  7. Electronic structure of nanocrystal quantum-dot quantumwells

    SciTech Connect

    Schrier, Joshua; Wang, Lin-Wang

    2006-06-26

    The electronic states of CdS/CdSe/CdS colloidal nanocrystalquantum-dot quantum wells are studied by large-scale pseudopotentiallocal density approximation (LDA) calculations. Using this approach, wedetermine the effects of CdS core size, CdSe well thickness, and CdSshell thickness on the band-edge wave functions, band-gap, andelectron-hole Coulomb interactions. We find the conduction-band wavefunction to be less confined to the CdSe well layer than predicted by kcdot p effective-mass theory, which accounts for the previous underestimation of the electron g factor.

  8. Photoluminescence-enhanced biocompatible quantum dots by phospholipid functionalization

    SciTech Connect

    Shi Yunfeng; He Peng Zhu Xinyuan

    2008-10-02

    A simple two-step strategy using phospholipid (PPL) to functionalize core/shell CdSe/ZnS quantum dots (QDs) has been described. The experimental data show that the use of S-H terminated PPL results not only in the high colloidal stability of core/shell CdSe/ZnS QDs in the aqueous phase, but also in the significant enhancement of photoluminescence. The degree of the enhancement is a function of the PPL-CdSe/ZnS QDs sample concentration. These results might be promising for future biological platform in new devices ranging from photovoltaic cells to biosensors and other devices.

  9. The dosimetric consequences of the new DOT LSA definition

    SciTech Connect

    Mis, F.J.

    1996-10-01

    As a result of the new regulations for the transportation of radioactive materials, the DOT and the NRC have implemented a rule designed to limit the activity in an LSA container. This is a new regulation designed to insure that the spirit of the law as well as the letter of the law are followed for LSA shipments. Specifically, it limits the dose rate at any location on an unshielded LSA container to less than 1 rem/hr at 3 meters. Other possible alternatives had been discussed prior to the implementation of this regulation including multiples of A{sub 2} values, as implemented by the French.

  10. Photocurrent extraction efficiency in colloidal quantum dot photovoltaics

    SciTech Connect

    Kemp, K. W.; Wong, C. T. O.; Hoogland, S. H.; Sargent, E. H.

    2013-11-18

    The efficiency of photocurrent extraction was studied directly inside operating Colloidal Quantum Dot (CQD) photovoltaic devices. A model was derived from first principles for a thin film p-n junction with a linearly spatially dependent electric field. Using this model, we were able to clarify the origins of recent improvement in CQD solar cell performance. From current-voltage diode characteristics under 1 sun conditions, we extracted transport lengths ranging from 39 nm to 86 nm for these materials. Characterization of the intensity dependence of photocurrent extraction revealed that the dominant loss mechanism limiting the transport length is trap-mediated recombination.

  11. Activation of molecular catalysts using semiconductor quantum dots

    DOEpatents

    Meyer, Thomas J.; Sykora, Milan; Klimov, Victor I.

    2011-10-04

    Photocatalytic materials based on coupling of semiconductor nanocrystalline quantum dots (NQD) and molecular catalysts. These materials have capability to drive or catalyze non-spontaneous chemical reactions in the presence of visible radiation, ultraviolet radiation, or both. The NQD functions in these materials as a light absorber and charge generator. Following light absorption, the NQD activates a molecular catalyst adsorbed on the surface of the NQD via transfer of one or more charges (either electrons or electron-holes) from the NQD to the molecular catalyst. The activated molecular catalyst can then drive a chemical reaction. A photoelectrolytic device that includes such photocatalytic materials is also described.

  12. Prediction of a strain-induced conduction-band minimum in embedded quantum dots

    SciTech Connect

    Williamson, A.J.; Zunger, A.; Canning, A.

    1998-02-01

    Free-standing InP quantum dots have previously been theoretically and experimentally shown to have a direct band gap across a large range of experimentally accessible sizes. We demonstrated that when these dots are embedded coherently within a GaP barrier material, the effects of quantum confinement in conjunction with coherent strain suggest there will be a critical diameter of dot ({approx}60 {Angstrom}), above which the dot is direct, type I, and below which it is indirect, type II. However, the strain in the system acts to produce another conduction state with an even lower energy, in which electrons are localized in small pockets at the interface between the InP dot and the GaP barrier. Since this conduction state is GaP X{sub 1c} derived and the highest occupied valence state is InP, {Gamma} derived, the fundamental transition is predicted to be indirect in both real and reciprocal space ({open_quotes}type II{close_quotes}) for all dot sizes. This effect is peculiar to the strained dot, and is absent in the freestanding dot. {copyright} {ital 1998} {ital The American Physical Society}

  13. Probing the size and environment induced phase transformation in CdSe quantum dots

    SciTech Connect

    Karakoti, Ajay S.; Sanghavi, Shail P.; Nachimuthu, Ponnusamy; Yang, Ping; Thevuthasan, Suntharampillai

    2011-11-17

    The structural and electronic properties of CdSe quantum dots in toluene and drop-casted on Si wafer were investigated by in-situ micro X-ray diffraction, X-ray photoelectron spectroscopy and UV-Vis absorption and emission spectroscopy. The in-situ micro diffraction data show that the CdSe quantum dots capped with TOPO or hexadecylamine (HDA) in toluene exhibit predominantly wurtzite crystal structure, which undergoes a phase transformation to zinc blende crystal structure following drop casting on Si and this phase transition increases with decreasing the size of the CdSe quantum dots. Decreasing the size of quantum dots also increases the Se vacancies that facilitate the phase transformation. The X-ray photoelectron spectra show a systematic increase in the core level binding energies of Cd 3d and Se 3d, the band gap and the Cd/Se ratio as the size of the quantum dots decreases from 6.6nm to 2.1nm. This is attributed to the quantum confinement of CdSe crystallites by the capping ligands in toluene which increases with decreasing the size of the quantum dots. However, drop-casting quantum dots on Si alter the density and arrangement of capping ligands and solvent molecules on the quantum dots which causes significant phase transformation.

  14. Statistical theory of Coulomb blockade oscillations: Quantum chaos in quantum dots

    SciTech Connect

    Jalabert, R.A.; Stone, A.D.; Alhassid, Y. (Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, Connecticut 06511 (United States))

    1992-06-08

    We develop a statistical theory of the amplitude of Coulomb blockade oscillations in semiconductor quantum dots based on the hypothesis that chaotic dynamics in the dot potential leads to behavior described by random-matrix theory. Breaking time-reversal symmetry is predicted to cause an experimentally observable change in the distribution of amplitudes. The theory is tested numerically and good agreement is found.

  15. PTL-5 From: Malin,Debra J - PTL-5

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    M - PFP-6; Clark,Harry W - PTL-5; Wilson,Scott K - PS-6; Olive,J Courtney - LP- 7; Larson,Cheryl A - PS-6 Subject: FW: PPC comments on EPP framework Attachments: PPC Comments -...

  16. EIS-0443: Record of Decision | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    235 miles of 500- kilovolt (kV) transmission line. SWIP-South would extend from Harry Allen substation near Las Vegas, Nevada northward to the proposed Thirtymile Substation near...

  17. DOE Extends Comment Period on Notice of Inquiry Under the Energy Independence and Security Act

    Energy.gov [DOE]

    Today, in response to a formal request, General Counsel Scott Blake Harris approved a second and final extension of the public comment period to November 30, 2010 on DOE’s Notice of Inquiry (75 FR...

  18. DOE Extends Comment Period on Notice of Inquiry Under the Energy Independence and Security Act

    Energy.gov [DOE]

    Today, in response to a formal request, General Counsel Scott Blake Harris approved a 30-day extension of the public comment period on DOE's Notice of Inquiry (75 FR 43945) soliciting comment on...

  19. GC Commits to Transparency on Nuclear Waste Fund Fee Adequacy Decisions

    Energy.gov [DOE]

    Consistent with the Administration's commitment to transparency, DOE General Counsel Scott Blake Harris has decided that all future determinations as to the adequacy of the Nuclear Waste Fund fee...

  20. DRAFT ADVICE - UNACCEPTABLE PROGRAM IMPACTS UNDER FY 97 BUDGET

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    7, 2001 Keith Klein, Manager U.S. Department of Energy, Richland Operations P.O. Box 550 (A7-50) Richland, WA 99352 Harry Boston, Manager U.S. Department of Energy, Office of River ...

  1. State Energy Advisory Board October 2012 Meeting | Department...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    BNL Overview PDF icon Copan PDF icon Aronson PDF icon Looney PDF icon Harris PDF icon Stokes PDF icon Energy Storage - Misewich More Documents & Publications The Long Island Solar ...

  2. Steven Croley | Department of Energy

    Energy.gov [DOE] (indexed site)

    Mr. Croley is the Harry Burns Hutchins Collegiate Professor of Law at the University of Michigan Law School (on leave since 2010). He began his academic career at Michigan in 1993. ...

  3. Transport and Failure in Li-ion Batteries | Stanford Synchrotron...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    in Li-ion Batteries Monday, February 13, 2012 - 1:30pm SSRL Conference Room 137-322 Stephen J. Harris, General Motors R&D While battery performance is well predicted by the...

  4. aec

    National Nuclear Security Administration (NNSA)

    blogkcp-operations-began-65-years-ago-today

    On Feb. 28, 1949,during Harry S. Truman's Presidency, the Bendix Corporation signed a prime contract to operate the...

  5. PNNL: About - Mission and Vision

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    and courage, our staff deliver time and time again. Listen as featured Senior Scientist Harry Miley describes how his work in ultra-trace, nuclear detection technology picked up...

  6. Microsoft PowerPoint - KCD Proj's Impact Fed Power_SWPA Conf...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    any operational changes to determine potential adverse impacts. BUILDING STRONG p Harry S. Truman Stilli B i R i Stilling Basin Repair S h d l Schedule 3 Jun -2 Jul: Contract...

  7. HABadv-121.doc

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Manager Department of Energy, Richland Operations P.O. 550 (A7-50) Richland, WA 99352 Harry Boston, Manager Department of Energy, Office of River Protection 2440 Stevens...

  8. http://www.hanford.gov/boards/hab/response/108.htm

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    136 Advice 108 From: Harry L. Boston Ms. Merilyn B. Reeves, Chair Hanford Advisory Board 723 The Parkway, Suite 200; B1 -41 Richland, Washington 99352 Dear Ms. Reeves: RESPONSE...

  9. Core Holes At Long Valley Caldera Geothermal Area (Chu, Et Al...

    OpenEI (Open Energy Information) [EERE & EIA]

    H.R. Westrich (1990) The Magma Energy Program John B. Rundle, Charles R. Carrigan, Harry C. Hardee, William C. Luth (1986) Deep Drilling to the Magmatic Environment in Long...

  10. DRAFT ADVICE - UNACCEPTABLE PROGRAM IMPACTS UNDER FY 97 BUDGET

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    of Energy, Richland Operations office P.O. Box 550 (A7-50) Richland, WA 99352 Harry Boston, Manager U.S. Department of Energy, Office of River Protection 2440 Stevens...

  11. Digging Crystal Deep

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    or slam it into a brick wall, and it won't blow up," says Los Alamos R&D engineer Bert Harry. Now it's time to replenish the explosive asthe U.S. Air Force and the National...

  12. P

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    P hotonic d esign p rinciples f or ultrahigh---efficiency p hotovoltaics Harry A . A twater & A lbert P olman * For d ecades, s olar---cell efficiencies h ave remained b elow t he...

  13. Clifton Truman Daniel's visit to Oak Ridge and Y-12, part 1

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    called me several weeks ago to state that he had initiated contact with President Harry S. Truman's grandson and that he was anxious to visit Oak Ridge. That was exciting...

  14. Energy Department Offers Conditional Commitment to Support Nevada...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    achieve energy independence," U.S. Senator Harry Reid said. "Northern Nevada is the Saudi Arabia of geothermal energy and I thank Secretary Chu for recognizing the Silver State's ...

  15. Remembering Fukushima: PNNL Monitors Radiation from Nuclear Disaster

    ScienceCinema

    Miley, Harry

    2014-06-12

    Senior Scientist Harry Miley describes how his work in ultra-trace, nuclear detection technology picked up the first reading of radiological materials over the U.S. following the nuclear power plant explosion in Japan.

  16. Friendswood, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    You can help OpenEI by expanding it. Friendswood is a city in Galveston County and Harris County, Texas. It falls under Texas's 14th congressional district and Texas's 22nd...

  17. Respond to the article | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    9:00am Use the form below to submit a question or comment to The Honorable LaDoris G. Harris about the article Today at 2:30 pm ET: Hangout With Science, Tech, and Innovation...

  18. Missouri City, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    You can help OpenEI by expanding it. Missouri City is a city in Fort Bend County and Harris County, Texas. It falls under Texas's 9th congressional district and Texas's 22nd...

  19. League City, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    You can help OpenEI by expanding it. League City is a city in Galveston County and Harris County, Texas. It falls under Texas's 14th congressional district and Texas's 22nd...

  20. Tomball, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Map This article is a stub. You can help OpenEI by expanding it. Tomball is a city in Harris County, Texas. It falls under Texas's 10th congressional district and Texas's 8th...

  1. Jacinto City, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    This article is a stub. You can help OpenEI by expanding it. Jacinto City is a city in Harris County, Texas. It falls under Texas's 29th congressional district.12 References...

  2. Jersey Village, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    article is a stub. You can help OpenEI by expanding it. Jersey Village is a city in Harris County, Texas. It falls under Texas's 7th congressional district.12 References ...

  3. Nassau Bay, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    This article is a stub. You can help OpenEI by expanding it. Nassau Bay is a city in Harris County, Texas. It falls under Texas's 22nd congressional district.12 References...

  4. Highlands, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    a stub. You can help OpenEI by expanding it. Highlands is a census-designated place in Harris County, Texas.1 References US Census Bureau 2005 Place to 2006 CBSA Retrieved...

  5. Hunters Creek Village, Texas: Energy Resources | Open Energy...

    OpenEI (Open Energy Information) [EERE & EIA]

    is a stub. You can help OpenEI by expanding it. Hunters Creek Village is a city in Harris County, Texas. It falls under Texas's 7th congressional district.12 References ...

  6. Seabrook, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    OpenEI by expanding it. Seabrook is a city in Chambers County and Galveston County and Harris County, Texas. It falls under Texas's 14th congressional district and Texas's 22nd...

  7. Shoreacres, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    stub. You can help OpenEI by expanding it. Shoreacres is a city in Chambers County and Harris County, Texas. It falls under Texas's 14th congressional district and Texas's 22nd...

  8. Pearland, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    OpenEI by expanding it. Pearland is a city in Brazoria County and Fort Bend County and Harris County, Texas. It falls under Texas's 14th congressional district and Texas's 22nd...

  9. Cinco Ranch, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    by expanding it. Cinco Ranch is a census-designated place in Fort Bend County and Harris County, Texas.1 References US Census Bureau 2005 Place to 2006 CBSA Retrieved...

  10. Barrett, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    a stub. You can help OpenEI by expanding it. Barrett is a census-designated place in Harris County, Texas.1 References US Census Bureau 2005 Place to 2006 CBSA Retrieved...

  11. Katy, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    is a stub. You can help OpenEI by expanding it. Katy is a city in Fort Bend County and Harris County and Waller County, Texas. It falls under Texas's 14th congressional district...

  12. Atascocita, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    stub. You can help OpenEI by expanding it. Atascocita is a census-designated place in Harris County, Texas.1 References US Census Bureau 2005 Place to 2006 CBSA Retrieved...

  13. Morgan's Point, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    article is a stub. You can help OpenEI by expanding it. Morgan's Point is a city in Harris County, Texas. It falls under Texas's 2nd congressional district.12 References ...

  14. West University Place, Texas: Energy Resources | Open Energy...

    OpenEI (Open Energy Information) [EERE & EIA]

    is a stub. You can help OpenEI by expanding it. West University Place is a city in Harris County, Texas. It falls under Texas's 7th congressional district.12 References ...

  15. Hilshire Village, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    article is a stub. You can help OpenEI by expanding it. Hilshire Village is a city in Harris County, Texas. It falls under Texas's 7th congressional district.12 References ...

  16. South Houston, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    article is a stub. You can help OpenEI by expanding it. South Houston is a city in Harris County, Texas. It falls under Texas's 29th congressional district.12 References...

  17. Aldine, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    is a stub. You can help OpenEI by expanding it. Aldine is a census-designated place in Harris County, Texas.1 References US Census Bureau 2005 Place to 2006 CBSA Retrieved...

  18. Osceola County, Iowa: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Zone Number 6 Climate Zone Subtype A. Places in Osceola County, Iowa Ashton, Iowa Harris, Iowa Melvin, Iowa Ocheyedan, Iowa Sibley, Iowa Retrieved from "http:en.openei.org...

  19. Southside Place, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    article is a stub. You can help OpenEI by expanding it. Southside Place is a city in Harris County, Texas. It falls under Texas's 7th congressional district.12 References ...

  20. Bunker Hill Village, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    is a stub. You can help OpenEI by expanding it. Bunker Hill Village is a city in Harris County, Texas. It falls under Texas's 7th congressional district.12 References ...

  1. Pine Mountain, Georgia: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    article is a stub. You can help OpenEI by expanding it. Pine Mountain is a town in Harris County and Meriwether County, Georgia. It falls under Georgia's 3rd congressional...

  2. Humble, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Map This article is a stub. You can help OpenEI by expanding it. Humble is a city in Harris County, Texas. It falls under Texas's 2nd congressional district and Texas's 18th...

  3. Piney Point Village, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    is a stub. You can help OpenEI by expanding it. Piney Point Village is a city in Harris County, Texas. It falls under Texas's 7th congressional district.12 References ...

  4. Hedwig Village, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    article is a stub. You can help OpenEI by expanding it. Hedwig Village is a city in Harris County, Texas. It falls under Texas's 7th congressional district.12 References ...

  5. Stafford, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    stub. You can help OpenEI by expanding it. Stafford is a city in Fort Bend County and Harris County, Texas. It falls under Texas's 9th congressional district and Texas's 22nd...

  6. Baytown, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    a stub. You can help OpenEI by expanding it. Baytown is a city in Chambers County and Harris County, Texas. It falls under Texas's 14th congressional district and Texas's 2nd...

  7. Waller, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Map This article is a stub. You can help OpenEI by expanding it. Waller is a city in Harris County and Waller County, Texas. It falls under Texas's 10th congressional...

  8. Channelview, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    stub. You can help OpenEI by expanding it. Channelview is a census-designated place in Harris County, Texas.1 References US Census Bureau 2005 Place to 2006 CBSA Retrieved...

  9. Cloverleaf, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    stub. You can help OpenEI by expanding it. Cloverleaf is a census-designated place in Harris County, Texas.1 References US Census Bureau 2005 Place to 2006 CBSA Retrieved...

  10. Mission Bend, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    by expanding it. Mission Bend is a census-designated place in Fort Bend County and Harris County, Texas.1 References US Census Bureau 2005 Place to 2006 CBSA Retrieved...

  11. Pasadena, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Map This article is a stub. You can help OpenEI by expanding it. Pasadena is a city in Harris County, Texas. It falls under Texas's 22nd congressional district and Texas's 29th...

  12. Crosby, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    is a stub. You can help OpenEI by expanding it. Crosby is a census-designated place in Harris County, Texas.1 References US Census Bureau 2005 Place to 2006 CBSA Retrieved...

  13. El Lago, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Map This article is a stub. You can help OpenEI by expanding it. El Lago is a city in Harris County, Texas. It falls under Texas's 22nd congressional district.12 References...

  14. Experimental studies of a quantum-mechanical three-body problem

    Office of Scientific and Technical Information (OSTI)

    ... Harris, H. C. Bryant, A. H. Mohagheghi, R. A. Reeder, H. Sharifian, C. Y. Tang, H. Tootoonchi, J. B. Donahue, C. R. Quick, D. C. Rislove, W. W. Smith, and J. E. Stewart, Phys. Rev. ...

  15. ORISE: Undergraduate Research Experiences - Ashley Cross

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    SULI participant Ashley Renee Cross used her bachelor's degree in biology to explore the ... who holds a Bachelor of Science degree in biology from Young Harris College in Georgia. ...

  16. Renewable Energy: Solar Fuels - Gordon Research Conference (Lucca...

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Sun, Feb 28, 2016 9:00am 09:00 Fri, Mar 4, 2016 5:00pm 17:00 Renaissance Tuscany Il Ciocco Lucca Italy Harry Atwater, "Artficial Photosynthesis Progress and Prospects" Giulia ...

  17. Diverse Power- Energy Efficient New Construction Rebate Programs

    Energy.gov [DOE]

    Diverse Power is a member-owned electric cooperative that provides electric service to customers in Troup, Harris, Heard, Meriwether, Muscogee and Coweta counties in Georgia. Diverse Power offers...

  18. 2014 Energy Campaign | Department of Energy

    Energy.gov [DOE] (indexed site)

    HARRIS, 2014 VICE CHAIR This year marks the 53rd anniversary of the Combined Federal Campaign, the world's largest and most successful charity drive. And DOE employees have been a...

  19. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Keith (1) Bryan Huff (1) Christina D,Moon (1) Christopher G,Knight (1) Christopher M,Thomas (1) David Williams (1) David,Harris (1) Douglas G. Patchen (1) Elizabeth,Saunders...

  20. Spring Valley, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Hide Map This article is a stub. You can help OpenEI by expanding it. Spring Valley is a city in Harris County, Texas. It falls under Texas's 7th congressional...

  1. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    ... Wang, Xiaohan (3) Yakobson, Boris I. (3) Bharathi, M. S. (2) Chen Hua (2) Chen, Wei (2) Chou, Harry (2) Cui, Ping (2) Save Results Save this search to My Library Excel (limit 2000) ...

  2. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Processes Leenheer, Andrew J. ; Sullivan, J P ; Shaw, M J ; Harris, C. Thomas ... Understanding Li-ion battery processes at the atomic- to nano-scale Sullivan, J P ; Huang, ...

  3. ALSNews Vol. 352

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    watch a video of a dendrite as it grows through a polymer membrane... Contact: Katherine Harry New See a list of all the summary slides for Industry @ ALS stories. The ALS...

  4. Steve Karsjen Public Affairs

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Imagine yourself watching different moving TV-like images on newspaper pages just like in Harry Potter films. And that's not all OLEDs might be used for. Someday they might make...

  5. ALSNews Vol. 334

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    or two about what the industry values. Harris is now at the ALS as a visiting scientist, sharing his insight and knowledge with ALS staff scientists working on battery research....

  6. Lignin Process Design Confirmation and Capitol Cost Evaluation: Report 42002/02 -- Review of Design

    SciTech Connect

    Montague, L.

    2003-10-01

    Harris Group prepared this report on NREL's conceptual design for a process that converts lignin into a hydrocarbon that can be used as a high-octane automobile fuel additive.

  7. Enforcing Energy-Efficiency Standards | Department of Energy

    Office of Environmental Management (EM)

    Enforcing Energy-Efficiency Standards Enforcing Energy-Efficiency Standards September 13, 2010 - 4:37pm Addthis Scott Blake Harris Former General Counsel What does this mean for ...

  8. EIS-0443: Final Environmental Impact Statement | Department of...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    SWIP-South would extend from Harry Allen substation near Las Vegas, Nevada northward to the proposed Thirtymile Substation near Ely, Nevada. Partial financing of SWlP-South is ...

  9. Microsoft Word - NNSA Public Scoping Meeting - 10_20_2011

    National Nuclear Security Administration (NNSA)

    Administration (NNSA) 12 Department of Energy (DOE) 13 Southeast Tennessee Trade and ... 7 ANN P. HARRIS 12 8 Sierra Club 9 CAROL GREEN (Comment Attached) 18 10 Oak Ridge ...

  10. SFA 2.0- Metabolic Potential

    SciTech Connect

    Banfield, Jill; Beller, Harry

    2015-02-17

    Berkeley Lab Earth Scientists Jill Banfield and Harry Beller explain the Sustainable Systems SFA 2.0 project's research on metabolic potential—or how metabolic lifestyles of microbial communities modulate in response to as well as influence environmental change.

  11. Window Manufacturer Sees Business Surge As Weatherization Supplier...

    Energy.gov [DOE] (indexed site)

    impact because of weatherization," says Mark Barr, a third-generation owner of 70-year-old family window manufacturing business Harry G. Barr Company, located in Fort Smith, Ark. ...

  12. Technical Standards Managers

    Energy.gov [DOE] (indexed site)

    Phone: (202) 586-7963 Fax: (202) 586-3859 stephen.lucke @nnsa.doe.gov DOE-NFO Sheila M. Harris TSM U.S. Department of Energy Centerra Nevada DOENNSANevada Field O ce MS 576...

  13. Organization Amount Volunteer

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    0 Nichols, B etsy --- 1 00 Hilltopper B asketball A cademy 1550 Carver, R endell --- 2 50 Harris, R obert --- 5 00 Logan, T arah --- 2 50 Peterson, D onald ( Pete) --- 5 00...

  14. SREL Reprint #3038

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    the Savannah River Site J. C. Seaman1, B. B. Looney2, and M. K. Harris2 1Savannah River Ecology Laboratory, The University of Georgia, Aiken, SC 29802, USA 2Savannah River...

  15. NETL F 451.1/1-1, Categorical Exclusion Designation Form

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    12121-6301-03 RPSEA Sugar Land, TX Clearview Subsea LLC, 16223 Park Row, Suite 175. Houston, Harris, Texas; Digitrol, Sao Paulo,Brazil; ProAnalysis, Bergen, Norway; JM Canty,...

  16. Secretary Chu and Senator Reid to Make Major Energy Announcement...

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Washington, D.C. - U.S. Secretary Steven Chu and U.S. Senator Harry Reid will host a press ... BRIEFING CONFERENCE CALL: Secretary Chu to Host Solar Energy Conference Call Secretaries ...

  17. Deer Park, Texas: Energy Resources | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Hide Map This article is a stub. You can help OpenEI by expanding it. Deer Park is a city in Harris County, Texas. It falls under Texas's 22nd congressional district...

  18. Title

    National Nuclear Security Administration (NNSA)

    Anita G. Harris Branch of Paleontology and Stratigraphy U. S. Geological Survey National ... km of Yucca Mountain in 1991. Cqnodont samples from two of these hew wells and 190 ...

  19. Manhattan Project: Debate Over How to Use the Bomb, 1945

    Office of Scientific and Technical Information (OSTI)

    J. Robert Oppenheimer, Enrico Fermi, and Ernest Lawrence In early May 1945, Secretary of War Henry L. Stimson, with the approval of President Harry S. Truman, formed an Interim ...

  20. Phononic Crystals&Devices. (Conference) | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Abstract not provided. Authors: Kim, Bongsang ; Shaner, Eric A. ; Harris, Charles Thomas ; El-Kady, Ihab F. ; Olsson, Roy H. ; Nguyen, Janet Publication Date: 2011-05-01 OSTI ...

  1. SRS Tank 48H Waste Treatment Project Technology Readiness Assessment

    Office of Environmental Management (EM)

    Savannah River Site Tank 48H Waste Treatment Project Technology Readiness Assessment Harry ... Energy Aiken, South Carolina SRS Tank 48H Waste Treatment Project SPD-07-195 Technology ...

  2. Karissa Marcum | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Karissa Marcum is a Public Affairs Specialist in the Office of Public Affairs. Most Recent The Internet Caf of the Nuclear World July 19 Harry Potter, Oxford and Nuclear Energy ...

  3. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    ... Abernathy, Harry (2) Celik, Ismail (2) Celik, Ismail B. (2) Chen, Long-Qing (2) Diamond, Harvey (2) Ding, Dong (2) Gerdes, Kirk R. (2) Hackett, Gregory (2) Li, Qun (2) Li, Xiaxi ...

  4. Secretary Chu, Senator Reid Announce Department of Energy Conditional Commitment for a Loan Guarantee for Nevada Geothermal Project

    Energy.gov [DOE]

    U.S. Energy Secretary Steven Chu and Senate Majority Leader Harry Reid today announced the offer of a conditional commitment to provide a partial guarantee for a $350 million loan for a geothermal power generation project.

  5. Remembering Fukushima: PNNL Monitors Radiation from Nuclear Disaster

    SciTech Connect

    Miley, Harry

    2014-03-07

    Senior Scientist Harry Miley describes how his work in ultra-trace, nuclear detection technology picked up the first reading of radiological materials over the U.S. following the nuclear power plant explosion in Japan.

  6. Water-soluble luminescent quantum dots and biomolecular conjugates thereof and related compositions and methods of use

    DOEpatents

    Nie, Shuming; Chan, Warren C. W.; Emory, Stephen

    2007-03-20

    The present invention provides a water-soluble luminescent quantum dot, a biomolecular conjugate thereof and a composition comprising such a quantum dot or conjugate. Additionally, the present invention provides a method of obtaining a luminescent quantum dot, a method of making a biomolecular conjugate thereof, and methods of using a biomolecular conjugate for ultrasensitive nonisotopic detection in vitro and in vivo.

  7. Water-soluble luminescent quantum dots and biomolecular conjugates thereof and related compositions and method of use

    DOEpatents

    Nie, Shuming; Chan, Warren C. W.; Emory, Steven R.

    2002-01-01

    The present invention provides a water-soluble luminescent quantum dot, a biomolecular conjugate thereof and a composition comprising such a quantum dot or conjugate. Additionally, the present invention provides a method of obtaining a luminescent quantum dot, a method of making a biomolecular conjugate thereof, and methods of using a biomolecular conjugate for ultrasensitive nonisotopic detection in vitro and in vivo.

  8. Single photon emission from site-controlled InGaN/GaN quantum dots

    SciTech Connect

    Zhang, Lei; Hill, Tyler A.; Deng, Hui; Teng, Chu-Hsiang; Lee, Leung-Kway; Ku, Pei-Cheng

    2013-11-04

    Single photon emission was observed from site-controlled InGaN/GaN quantum dots. The single-photon nature of the emission was verified by the second-order correlation function up to 90 K, the highest temperature to date for site-controlled quantum dots. Micro-photoluminescence study on individual quantum dots showed linearly polarized single exciton emission with a lifetime of a few nanoseconds. The dimensions of these quantum dots were well controlled to the precision of state-of-the-art fabrication technologies, as reflected in the uniformity of their optical properties. The yield of optically active quantum dots was greater than 90%, among which 13%–25% exhibited single photon emission at 10 K.

  9. Engineering the hole confinement for CdTe-based quantum dot molecules

    SciTech Connect

    Kłopotowski, Ł. Wojnar, P.; Kret, S.; Fronc, K.; Wojtowicz, T.; Karczewski, G.

    2015-06-14

    We demonstrate an efficient method to engineer the quantum confinement in a system of two quantum dots grown in a vertical stack. We achieve this by using materials with a different lattice constant for the growth of the outer and inner barriers. We monitor the resulting dot morphology with transmission electron microscopy studies and correlate the results with ensemble quantum dot photoluminescence. Furthermore, we embed the double quantum dots into diode structures and study photoluminescence as a function of bias voltage. We show that in properly engineered structures, it is possible to achieve a resonance of the hole states by tuning the energy levels with electric field. At the resonance, we observe signatures of a formation of a molecular state, hybridized over the two dots.

  10. Phonon bottleneck in p-type Ge/Si quantum dots

    SciTech Connect

    Yakimov, A. I.; Kirienko, V. V.; Armbrister, V. A.; Bloshkin, A. A.; Dvurechenskii, A. V.

    2015-11-23

    We study the effect of quantum dot size on the mid-infrared photo- and dark current, photoconductive gain, and hole capture probability in ten-period p-type Ge/Si quantum dot heterostructures. The dot dimensions are varied by changing the Ge coverage and the growth temperature during molecular beam epitaxy of Ge/Si(001) system in the Stranski-Krastanov growth mode. In all samples, we observed the general tendency: with decreasing the size of the dots, the dark current and hole capture probability are reduced, while the photoconductive gain and photoresponse are enhanced. Suppression of the hole capture probability in small-sized quantum dots is attributed to a quenched electron-phonon scattering due to phonon bottleneck.

  11. Formation of strain-induced quantum dots in gated semiconductor nanostructures

    SciTech Connect

    Thorbeck, Ted; Zimmerman, Neil M.

    2015-08-15

    A long-standing mystery in the field of semiconductor quantum dots (QDs) is: Why are there so many unintentional dots (also known as disorder dots) which are neither expected nor controllable. It is typically assumed that these unintentional dots are due to charged defects, however the frequency and predictability of the location of the unintentional QDs suggests there might be additional mechanisms causing the unintentional QDs besides charged defects. We show that the typical strains in a semiconductor nanostructure from metal gates are large enough to create strain-induced quantum dots. We simulate a commonly used QD device architecture, metal gates on bulk silicon, and show the formation of strain-induced QDs. The strain-induced QD can be eliminated by replacing the metal gates with poly-silicon gates. Thus strain can be as important as electrostatics to QD device operation operation.

  12. Charge-transfer dynamics in multilayered PbS and PbSe quantum dot architectures

    SciTech Connect

    Xu, F.; Ma, X.; Haughn, C. R.; Doty, M. F.; Cloutier, S. G.

    2014-02-03

    We demonstrate control of the charge transfer process in PbS and PbSe quantum dot assemblies. We first demonstrate efficient charge transfer from donor quantum dots to acceptor quantum dots in a multi-layer PbSe cascade structure. Then, we assemble type-I and type-II heterostructures using both PbS and PbSe quantum dots via careful control of the band alignment. In type-I structures, photo-generated carriers are transferred and localized in the smaller bandgap (acceptor) quantum dots, resulting in a significant luminescence enhancement. In contrast, a significant luminescence quenching and shorter emission lifetime confirms an efficient separation of photo-generated carriers in the type-II architecture.

  13. Intermediate-band photosensitive device with quantum dots embedded in energy fence barrier

    DOEpatents

    Forrest, Stephen R.; Wei, Guodan

    2010-07-06

    A plurality of layers of a first semiconductor material and a plurality of dots-in-a-fence barriers disposed in a stack between a first electrode and a second electrode. Each dots-in-a-fence barrier consists essentially of a plurality of quantum dots of a second semiconductor material embedded between and in direct contact with two layers of a third semiconductor material. Wave functions of the quantum dots overlap as at least one intermediate band. The layers of the third semiconductor material are arranged as tunneling barriers to require a first electron and/or a first hole in a layer of the first material to perform quantum mechanical tunneling to reach the second material within a respective quantum dot, and to require a second electron and/or a second hole in a layer of the first semiconductor material to perform quantum mechanical tunneling to reach another layer of the first semiconductor material.

  14. Induced spin-accumulation and spin-polarization in a quantum-dot ring by using magnetic quantum dots and Rashba spin-orbit effect

    SciTech Connect

    Eslami, L. Faizabadi, E.

    2014-05-28

    The effect of magnetic contacts on spin-dependent electron transport and spin-accumulation in a quantum ring, which is threaded by a magnetic flux, is studied. The quantum ring is made up of four quantum dots, where two of them possess magnetic structure and other ones are subjected to the Rashba spin-orbit coupling. The magnetic quantum dots, referred to as magnetic quantum contacts, are connected to two external leads. Two different configurations of magnetic moments of the quantum contacts are considered; the parallel and the anti-parallel ones. When the magnetic moments are parallel, the degeneracy between the transmission coefficients of spin-up and spin-down electrons is lifted and the system can be adjusted to operate as a spin-filter. In addition, the accumulation of spin-up and spin-down electrons in non-magnetic quantum dots are different in the case of parallel magnetic moments. When the intra-dot Coulomb interaction is taken into account, we find that the electron interactions participate in separation between the accumulations of electrons with different spin directions in non-magnetic quantum dots. Furthermore, the spin-accumulation in non-magnetic quantum dots can be tuned in the both parallel and anti-parallel magnetic moments by adjusting the Rashba spin-orbit strength and the magnetic flux. Thus, the quantum ring with magnetic quantum contacts could be utilized to create tunable local magnetic moments which can be used in designing optimized nanodevices.

  15. Colloidal quantum dot solar cells on curved and flexible substrates

    SciTech Connect

    Kramer, Illan J.; Moreno-Bautista, Gabriel; Minor, James C.; Kopilovic, Damir; Sargent, Edward H.

    2014-10-20

    Colloidal quantum dots (CQDs) are semiconductor nanocrystals synthesized with, processed in, and deposited from the solution phase, potentially enabling low-cost, facile manufacture of solar cells. Unfortunately, CQD solar cell reports, until now, have only explored batch-processing methods—such as spin-coating—that offer limited capacity for scaling. Spray-coating could offer a means of producing uniform colloidal quantum dot films that yield high-quality devices. Here, we explore the versatility of the spray-coating method by producing CQD solar cells in a variety of previously unexplored substrate arrangements. The potential transferability of the spray-coating method to a roll-to-roll manufacturing process was tested by spray-coating the CQD active layer onto six substrates mounted on a rapidly rotating drum, yielding devices with an average power conversion efficiency of 6.7%. We further tested the manufacturability of the process by endeavoring to spray onto flexible substrates, only to find that spraying while the substrate was flexed was crucial to achieving champion performance of 7.2% without compromise to open-circuit voltage. Having deposited onto a substrate with one axis of curvature, we then built our CQD solar cells onto a spherical lens substrate having two axes of curvature resulting in a 5% efficient device. These results show that CQDs deposited using our spraying method can be integrated to large-area manufacturing processes and can be used to make solar cells on unconventional shapes.

  16. IDC System Specification Document Version 1.1.

    SciTech Connect

    Harris, James M.; Lober, Randall R.

    2015-02-01

    This document contains the system specifications derived to satisfy the system requirements found in the IDC System Requirements Document for the IDC Reengineering Phase 2 project. Revisions Version Date Author/Team Revision Description Authorized by V1.0 12/2014 IDC Reengineering Project Team Initial delivery M. Harris V1.1 2/2015 IDC Reengineering Project Team Iteration I2 Review Comments M. Harris

  17. ~tx22C0.ptx

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    + + + + + STUDYING THE COMMUNICATIONS REQUIREMENTS OF ELECTRIC UTILITIES TO INFORM FEDERAL SMART GRID POLICIES + + + + + PUBLIC MEETING + + + + + THURSDAY, JUNE 17, 2010 + + + + + The Public Meeting was held in Room 8E069 at the Department of Energy, Forrestal Building, 1000 Independence Avenue, S.W., Washington, D.C., at 10:00 a.m., Scott Blake Harris, Chair, presiding. PRESENT: BECKY BLALOCK SHERMAN J. ELLIOTT LYNNE ELLYN SCOTT BLAKE HARRIS JIM INGRAHAM JIM L. JONES MICHAEL LANMAN KYLE

  18. Before the House Subcommittee on Energy and Power, Committee on Energy and

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Commerce | Department of Energy LaDoris Harris, Director of the Office of Economic Impact and Diversity Before the House Subcommittee on Energy and Power, Committee on Energy and Commerce 9-17-14_LaDoris__Harris FT HEC.pdf (48.17 KB) More Documents & Publications Minorities in Energy Strategic Plan Executive Summary: September 24, 2013 Kick Off of the Minorities in Energy Initiative Program Booklet - November 13 2013

  19. Impact of Hydrogen Production on U.S. Energy Markets

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Hydrogen Production on Impact of Hydrogen Production on U.S. Energy Markets U.S. Energy Markets Presented to: Presented to: DOE Hydrogen Transition DOE Hydrogen Transition Analysis Workshop Analysis Workshop Washington DC Washington DC January 26, 2006 January 26, 2006 Prepared by: Prepared by: E. Harry Vidas, Energy and Environmental Analysis, Inc. E. Harry Vidas, Energy and Environmental Analysis, Inc. Paul Friley, Brookhaven National Laboratory Paul Friley, Brookhaven National Laboratory AZ

  20. Light-Material Interactions in Energy Conversion - Energy Frontier Research

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Center (LMI-EFRC) Harry Atwater welcome presentation Professor Harry Atwater gives the introductory presentation workshop audience Workshop participants in the Hameetman Auditorium Geoffrey Kinsey presentation Dr. Geoffrey Kinsey explores concentrator photovoltaics for high-efficiency photovoltaics. workshop Dr. Wladek Walukiewicz speaks with workshop participants. best poster award Lanfang Li, a Ph.D. Candidate in Prof. Ralph Nuzzo's group at UIUC and a member of the LMI-EFRC, won the Best

  1. Light-Material Interactions in Energy Conversion - Energy Frontier Research

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Center (LMI-EFRC) nuzzo LMI Deputy Director and UIUC Professor Ralph Nuzzo welcomes the audience. hofmann LMI Assistant Director Dr. Carrie Hofmann introduces the first speaker, LMI Director Prof. Harry Atwater. atwater Harry Atwater's presentation "Photonic Design Principles for Ultrahigh Efficiency Photovoltaics" John Rogers' presentation "Microscale Solar Cells for Macroscale Power Generation" eli Eli Yablonovitch's presentation "The Multi-Spectral Opto-Electronic

  2. Light-Material Interactions in Energy Conversion - Energy Frontier Research

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Center (LMI-EFRC) - People Executive Committee Ralph G. Nuzzo Director Ralph G. Nuzzo, G. L. Clark Professor of Chemistry; Director, LMI-EFRC; Visiting Associate in Applied Physics and Materials Science, California Institute of Technology University of Illinois at Urbana-Champaign and California Institute of Technology Harry Atwater Associate Director Harry Atwater, Howard Hughes Professor and Professor of Applied Physics and Materials Science; Director, Joint Center for Artificial

  3. 2016 Sustainable Transportation Summit Speaker Biographies

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Sustainable Transportation Summit: July 11-12, 2016 SPEAKER BIOGRAPHIES: Dr. Harry Atwater Howard Hughes Professor of Applied Physics and Materials Science California Institute of Technology Harry Atwater is the Howard Hughes Professor of Applied Physics and Materials Science at the California Institute of Technology. Professor Atwater currently serves as Director of the DOE Joint Center for Artificial Photosynthesis. Atwater's scientific interests have two themes: photovoltaics and solar energy

  4. Non-Metals Workshop | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Metals Workshop Non-Metals Workshop Presentation by Aaron Harris, Sandia National Laboratories, at the U.S. Department of Energy's Polymer and Composite Materials Meeting, held October 17-18, 2012, in Washington, D.C. poly_comp_materials_harris.pdf (329.33 KB) More Documents & Publications US DRIVE Hydrogen Codes and Standards Technical Team Roadmap Component and System Qualification Workshop Proceedings Introduction to SAE Hydrogen Fueling Standardization

  5. Microsoft Word - AHT Ex Parte.docx

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    October 4, 2016 MEMORANDUM OF EX PARTE COMMUNICATION Docket Number: EERE-2013-BT-TP-0025; RIN 1904-AC99 Meeting Date: September 29, 2016 Attendees: Scott Blake Harris and John Hodges (Harris, Wiltshire & Grannis LLP), on behalf of AHT Cooling Systems GmbH and AHT Cooling Systems USA Inc. (collectively AHT); Daniel Cohen and Johanna H. Jochum (Office of the General Counsel, United States Department of Energy). Meeting Summary: On behalf of AHT we explained that certain AHT commercial

  6. Light-Material Interactions in Energy Conversion - Energy Frontier Research

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    Center (LMI-EFRC) Lectures from the LMI-EFRC "Fundamental Challenges in Solar Energy Conversion" Workshop, July 7, 2010, Caltech Harry Atwater Introduction to the Workshop on Fundamental Challenges in Solar Energy Conversion Harry A. Atwater, Caltech Eli Yablonovitch Fundamental Limits to Light Absorption and Efficiency in Photovoltaics Eli Yablonovitch, University of California, Berkeley Richard Swanson Efficiency Limits and Cost Challenges in Photovoltaics Richard Swanson,

  7. Federal Agencies Outline Bioeconomy Vision and Current Activities |

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Department of Energy Agencies Outline Bioeconomy Vision and Current Activities Federal Agencies Outline Bioeconomy Vision and Current Activities February 22, 2016 - 12:30pm Addthis Federal Agencies Outline Bioeconomy Vision and Current Activities Harry Baumes Harry Baumes Senior Executive Advisor to the Bioenergy Technologies Office and Director, Office of Energy Policy and New Uses, U.S. Department of Agriculture This week at the Advanced Bioeconomy Leadership Conference, the U.S.

  8. Microsoft Word - Final EA for HARC Battleground.doc

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    9 FINAL ENVIRONMENTAL ASSESSMENT BATTLEGROUND ENERGY RECOVERY PROJECT HARRIS COUNTY, TEXAS U.S. DEPARTMENT OF ENERGY National Energy Technology Laboratory OCTOBER 2011 THIS PAGE INTENTIONALLY LEFT BLANK COVER SHEET Responsible Agency: U.S. Department of Energy Title: Final Environmental Assessment for the Battleground Energy Recovery Project (DOE/EA-1769) Location: Deer Park, Harris County, Texas Contact: William J. Gwilliam, Document Manager National Energy Technology Laboratory U.S. Department

  9. Technical Staff, Engine Combustion, Sandia National Laboratories | National

    National Nuclear Security Administration (NNSA)

    Nuclear Security Administration | (NNSA) Technical Staff, Engine Combustion, Sandia National Laboratories Charles Mueller Charles Mueller August 2009 Harry L. Horning Memorial Award Chuck Mueller, a member of Sandia National Laboratories technical staff, has received the 2008 Harry L. Horning Memorial Award for his work on the paper, "Early Direct-Injection, Low-Temperature Combustion of Diesel Fuel in an Optical Engine Utilizing a 15-Hole, Dual-Row, Narrow-Included-Angle Nozzle."

  10. Effect of the length of ligands passivating quantum dots on the electrooptical characteristics of organic light-emitting diodes

    SciTech Connect

    Kurochkin, N. S.; Vashchenko, A. A. Vitukhnovsky, A. G.; Tananaev, P. N.

    2015-07-15

    The electrooptical characteristics of organic light-emitting diodes with quantum dots passivated with organic ligands of different lengths as emitting centers are investigated. It is established that the thickness of the ligand coating covering the quantum dots has little effect on the Förster energy transfer in the diodes, but significantly affects the direct injection of charge carriers into the quantum-dot layer. It is shown that the thickness of the passivation coating covering the quantum dots in a close-packed nanoparticle layer is deter- mined both by the length of passivating ligands and the degree of quantum-dot coverage with ligands.

  11. Effect of swift heavy ion irradiation on bare and coated ZnS quantum dots

    SciTech Connect

    Chowdhury, S. Hussain, A.M.P.; Ahmed, G.A.; Singh, F.; Avasthi, D.K.; Choudhury, A.

    2008-12-01

    The present study compares structural and optical modifications of bare and silica (SiO{sub 2}) coated ZnS quantum dots under swift heavy ion (SHI) irradiation. Bare and silica coated ZnS quantum dots were prepared following an inexpensive chemical route using polyvinyl alcohol (PVA) as the dielectric host matrix. X-ray diffraction (XRD) and transmission electron microscopy (TEM) study of the samples show the formation of almost spherical ZnS quantum dots. The UV-Vis absorption spectra reveal blue shift relative to bulk material in absorption energy while photoluminescence (PL) spectra suggests that surface state and near band edge emissions are dominating in case of bare and coated samples, respectively. Swift heavy ion irradiation of the samples was carried out with 160 MeV Ni{sup 12+} ion beam with fluences 10{sup 12} to 10{sup 13} ions/cm{sup 2}. Size enhancement of bare quantum dots after irradiation has been indicated in XRD and TEM analysis of the samples which has also been supported by optical absorption spectra. However similar investigations on irradiated coated quantum dots revealed little change in quantum dot size and emission. The present study thus shows that the coated ZnS quantum dots are stable upon SHI irradiation compared to the bare one.

  12. Tuning the properties of Ge-quantum dots superlattices in amorphous silica matrix through deposition conditions

    SciTech Connect

    Pinto, S. R. C.; Ramos, M. M. D.; Gomes, M. J. M.; Buljan, M.; Chahboun, A.; Roldan, M. A.; Molina, S. I.; Bernstorff, S.; Varela, M.; Pennycook, S. J.; Barradas, N. P.; Alves, E.

    2012-04-01

    In this work, we investigate the structural properties of Ge quantum dot lattices in amorphous silica matrix, prepared by low-temperature magnetron sputtering deposition of (Ge+SiO{sub 2})/SiO{sub 2} multilayers. The dependence of quantum dot shape, size, separation, and arrangement type on the Ge-rich (Ge + SiO{sub 2}) layer thickness is studied. We show that the quantum dots are elongated along the growth direction, perpendicular to the multilayer surface. The size of the quantum dots and their separation along the growth direction can be tuned by changing the Ge-rich layer thickness. The average value of the quantum dots size along the lateral (in-plane) direction along with their lateral separation is not affected by the thickness of the Ge-rich layer. However, the thickness of the Ge-rich layer significantly affects the quantum dot ordering. In addition, we investigate the dependence of the multilayer average atomic composition and also the quantum dot crystalline quality on the deposition parameters.

  13. Red light-emitting diodes based on InP/GaP quantum dots

    SciTech Connect

    Hatami, F.; Lordi, V.; Harris, J.S.; Kostial, H.; Masselink, W.T.

    2005-05-01

    The growth, fabrication, and device characterization of InP quantum-dot light-emitting diodes based on GaP are described and discussed. The diode structures are grown on gallium phosphide substrates using gas-source molecular-beam epitaxy and the active region of the diode consists of self-assembled InP quantum dots embedded in a GaP matrix. Red electroluminescence originating from direct band-gap emission from the InP quantum dots is observed at low temperatures.With increasing temperature, however, the emission line shifts to the longer wavelength. The emission light is measured to above room temperature.

  14. Direct Observation of Energy-Gap Scaling Law in CdSe Quantum Dots with Positrons

    SciTech Connect

    Denison, Arthur Blanchard; Weber, M. H.; Lynn, K. G.; Barbiellini, B.; Sterne, P. A.

    2002-07-01

    CdSe quantum dot samples with sizes in the range of 1.8~6 nm in diameter were examined by positron annihilation spectroscopy. The results were compared to data obtained for single-crystal bulk CdSe. Evidence is provided that the positrons annihilate within the nanospheres. The annihilation line shape shows a smearing at the boundary of the Jones zone proportional to the widening of the band gap due to a reduction in the size of the quantum dots. The data confirm that the change in the band gap is inversely proportional to the square of the quantum dot diameter.

  15. The use of bulk states to accelerate the band edge statecalculation of a semiconductor quantum dot

    SciTech Connect

    Vomel, Christof; Tomov, Stanimire Z.; Wang, Lin-Wang; Marques,Osni A.; Dongarra, Jack J.

    2006-05-10

    We present a new technique to accelerate the convergence of the folded spectrum method in empirical pseudopotential band edge state calculations for colloidal quantum dots. We use bulk band states of the materials constituent of the quantum dot to construct initial vectors and a preconditioner. We apply these to accelerate the convergence of the folded spectrum method for the interior states at the top of the valence and the bottom of the conduction band. For large CdSe quantum dots, the number of iteration steps until convergence decreases by about a factor of 4 compared to previous calculations.

  16. R&D Magazine: Windows into Solar Power Sources with Quantum Dots

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    R&D Magazine: Windows into Solar Power Sources with Quantum Dots R&D Magazine: Windows into Solar Power Sources with Quantum Dots A luminescent solar concentrator is an emerging sunlight harvesting technology that has the potential to disrupt the way we think about energy: It could turn any window into a daytime power source. August 30, 2015 R&D Magazine: Windows into Solar Power Sources with Quantum Dots A luminescent solar concentrator is an emerging sunlight harvesting technology

  17. Far off-resonant coupling between photonic crystal microcavity and single quantum dot with resonant excitation

    SciTech Connect

    Banihashemi, Mehdi; Ahmadi, Vahid, E-mail: v-ahmadi@modares.ac.ir [Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, P.O. Box 14115-194 (Iran, Islamic Republic of)] [Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, P.O. Box 14115-194 (Iran, Islamic Republic of); Nakamura, Tatsuya; Kojima, Takanori; Kojima, Kazunobu; Noda, Susumu [Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan)] [Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan)

    2013-12-16

    In this paper, we experimentally demonstrate that with sub-nanowatt coherent s-shell excitation of a single InAs quantum dot, off-resonant coupling of 4.1?nm is possible between L3 photonic crystal microcavity and the quantum dot at 50?K. This resonant excitation reduces strongly the effect of surrounding charges to quantum dot, multiexciton complexes and pure dephasing. It seems that this far off-resonant coupling is the result of increased number of acoustical phonons due to high operating temperature of 50?K. The 4.1?nm detuning is the largest amount for this kind of coupling.

  18. On-chip generation and guiding of quantum light from a site-controlled quantum dot

    SciTech Connect

    Jamil, Ayesha; Farrer, Ian; Griffiths, Jonathan P.; Jones, Geb A. C.; Ritchie, David A.; Skiba-Szymanska, Joanna; Kalliakos, Sokratis; Ward, Martin B.; Ellis, David J. P.; Shields, Andrew J.; Schwagmann, Andre; Brody, Yarden; Cambridge Research Laboratory, Toshiba Research Europe Limited, 208 Science Park, Milton Road, Cambridge, CB4 0GZ

    2014-03-10

    We demonstrate the emission and routing of single photons along a semiconductor chip originating from carrier recombination in an actively positioned InAs quantum dot. Devicescale arrays of quantum dots are formed by a twostep regrowth process. We precisely locate the propagating region of a unidirectional photonic crystal waveguide with respect to the quantum dot nucleation site. Under pulsed optical excitation, the multiphoton emission probability from the waveguide's exit is 12%??5% before any background correction. Our results are a major step towards the deterministic integration of a quantum emitter with the waveguiding components of photonic quantum circuits.

  19. R&D Magazine: Windows into Solar Power Sources with Quantum Dots

    U.S. Department of Energy (DOE) - all webpages (Extended Search)

    R&D Magazine: Windows into Solar Power Sources with Quantum Dots August 30, 2015 R&D Magazine: Windows into Solar Power Sources with Quantum Dots A luminescent solar concentrator is an emerging sunlight harvesting technology that has the potential to disrupt the way we think about energy: It could turn any window into a daytime power source. "In these devices, a fraction of light transmitted through the window is absorbed by nano-sized particles (semiconductor quantum dots)

  20. Science-based design of stable quantum dots for energy-efficient lighting

    Office of Scientific and Technical Information (OSTI)

    (Technical Report) | SciTech Connect Science-based design of stable quantum dots for energy-efficient lighting Citation Details In-Document Search Title: Science-based design of stable quantum dots for energy-efficient lighting II-VI quantum dots, such as CdSe and CdTe, are attractive as downconversion materials for solid-state lighting, because of their narrow linewidth, tunable emission. However, for these materials to have acceptable quantum yields (QYs) requires that they be coated with

  1. Graded Alloy Quantum Dots for Energy-Efficient Solid-State Lighting |

    Office of Energy Efficiency and Renewable Energy (EERE) (indexed site)

    Department of Energy Graded Alloy Quantum Dots for Energy-Efficient Solid-State Lighting Graded Alloy Quantum Dots for Energy-Efficient Solid-State Lighting Lead Performer: Columbia University - New York, NY DOE Total Funding: $1,014,798 Cost Share: $257,534 Project Term: September 1, 2016 - August 31, 2018 Funding Opportunity: SSL R&D Funding Opportunity Announcement (FOA) (DE-FOA-0001364) Project Objective This project will use an inexpensive and widely tunable library of quantum dot

  2. Interaction of graphene quantum dots with bulk semiconductor surfaces

    SciTech Connect

    Mohapatra, P. K.; Singh, B. P.; Kushavah, Dushyant; Mohapatra, J.

    2015-05-15

    Highly luminescent graphene quantum dots (GQDs) are synthesized through thermolysis of glucose. The average lateral size of the synthesized GQDs is found to be ∼5 nm. The occurrence of D and G band at 1345 and 1580 cm{sup −1} in Raman spectrum confirms the presence of graphene layers. GQDs are mostly consisting of 3 to 4 graphene layers as confirmed from the AFM measurements. Photoluminescence (PL) measurement shows a distinct broadening of the spectrum when GQDs are on the semiconducting bulk surface compared to GQDs in water. The time resolved PL measurement shows a significant shortening in PL lifetime due to the substrate interaction on GQDs compared to the GQDs in solution phase.

  3. Location deterministic biosensing from quantum-dot-nanowire assemblies

    SciTech Connect

    Liu, Chao; Kim, Kwanoh; Fan, D. L.

    2014-08-25

    Semiconductor quantum dots (QDs) with high fluorescent brightness, stability, and tunable sizes, have received considerable interest for imaging, sensing, and delivery of biomolecules. In this research, we demonstrate location deterministic biochemical detection from arrays of QD-nanowire hybrid assemblies. QDs with diameters less than 10 nm are manipulated and precisely positioned on the tips of the assembled Gold (Au) nanowires. The manipulation mechanisms are quantitatively understood as the synergetic effects of dielectrophoretic (DEP) and alternating current electroosmosis (ACEO) due to AC electric fields. The QD-nanowire hybrid sensors operate uniquely by concentrating bioanalytes to QDs on the tips of nanowires before detection, offering much enhanced efficiency and sensitivity, in addition to the position-predictable rationality. This research could result in advances in QD-based biomedical detection and inspires an innovative approach for fabricating various QD-based nanodevices.

  4. Profiling the local carrier concentration across a semiconductor quantum dot

    SciTech Connect

    Walrath, J. C.; Lin, Yen-Hsiang; Huang, S.; Goldman, R. S.

    2015-05-11

    We profile the local carrier concentration, n, across epitaxial InAs/GaAs quantum dots (QDs) consisting of 3D islands on top of a 2D alloy layer. We use scanning thermoelectric microscopy to measure a profile of the temperature gradient-induced voltage, which is converted to a profile of the local Seebeck coefficient, S. The S profile is then converted to a conduction band-edge profile and compared with Poisson-Schrodinger band-edge simulations. Our combined computational-experimental approach suggests a reduced carrier concentration in the QD center in comparison to that of the 2D alloy layer. The relative roles of free carrier trapping and/or dopant expulsion are discussed.

  5. Quantum Dot Solar Cells with Multiple Exciton Generation

    SciTech Connect

    Hanna, M. C.; Beard, M. C.; Johnson, J. C.; Murphy, J.; Ellingson, R. J.; Nozik, A. J.

    2005-11-01

    We have measured the quantum yield of the multiple exciton generation (MEG) process in quantum dots (QDs) of the lead-salt semiconductor family (PbSe, PbTe, and PbS) using fs pump-probe transient absorption measurements. Very high quantum yields (up to 300%) for charge carrier generation from MEG have been measured in all of the Pb-VI QDs. We have calculated the potential maximum performance of various MEG QD solar cells in the detailed balance limit. We examined a two-cell tandem PV device with singlet fission (SF), QD, and normal dye (N) absorbers in the nine possible series-connected combinations to compare the tandem combinations and identify the combinations with the highest theoretical efficiency. We also calculated the maximum efficiency of an idealized single-gap MEG QD solar cell with M multiplications and its performance under solar concentration.

  6. Stranski-Krastanov InN/InGaN quantum dots grown directly on Si(111)

    SciTech Connect

    Soto Rodriguez, Paul E. D. Aseev, Pavel; Gómez, Victor J.; Kumar, Praveen; Ul Hassan Alvi, Naveed; Calleja, Enrique; Morales, Francisco M.; Senichev, Alexander; Lienau, Christoph; Nötzel, Richard

    2015-01-12

    The authors discuss and demonstrate the growth of InN surface quantum dots on a high-In-content In{sub 0.73}Ga{sub 0.27}N layer, directly on a Si(111) substrate by plasma-assisted molecular beam epitaxy. Atomic force microscopy and transmission electron microscopy reveal uniformly distributed quantum dots with diameters of 10–40 nm, heights of 2–4 nm, and a relatively low density of ∼7 × 10{sup 9} cm{sup −2}. A thin InN wetting layer below the quantum dots proves the Stranski-Krastanov growth mode. Near-field scanning optical microscopy shows distinct and spatially well localized near-infrared emission from single surface quantum dots. This holds promise for future telecommunication and sensing devices.

  7. Excitonic optical properties of wurtzite ZnS quantum dots under pressure

    SciTech Connect

    Zeng, Zaiping; Garoufalis, Christos S.; Baskoutas, Sotirios; Bester, Gabriel

    2015-03-21

    By means of atomistic empirical pseudopotentials combined with a configuration interaction approach, we have studied the optical properties of wurtzite ZnS quantum dots in the presence of strong quantum confinement effects as a function of pressure. We find the pressure coefficients of quantum dots to be highly size-dependent and reduced by as much as 23% in comparison to the bulk value of 63 meV/GPa obtained from density functional theory calculations. The many-body excitonic effects on the quantum dot pressure coefficients are found to be marginal. The absolute gap deformation potential of quantum dots originates mainly from the energy change of the lowest unoccupied molecular orbital state. Finally, we find that the exciton spin-splitting increases nearly linearly as a function of applied pressure.

  8. Mastermind Session: Connecting the Dots Between the Real Estate Market and Residential Energy Efficiency

    Energy.gov [DOE]

    Better Buildings Residential Network Program Sustainability Series Mastermind Call: Connecting the Dots Between the Real Estate Market and Residential Energy Efficiency Featuring Host Rich Dooley, Arlington County, VA, Call Slides and Discussion Summary, August 14, 2014.

  9. Fabrication and single-electron-transfer operation of a triple-dot single-electron transistor

    SciTech Connect

    Jo, Mingyu Uchida, Takafumi; Tsurumaki-Fukuchi, Atsushi; Arita, Masashi; Takahashi, Yasuo; Fujiwara, Akira; Nishiguchi, Katsuhiko; Ono, Yukinori; Inokawa, Hiroshi

    2015-12-07

    A triple-dot single-electron transistor was fabricated on silicon-on-insulator wafer using pattern-dependent oxidation. A specially designed one-dimensional silicon wire having small constrictions at both ends was converted to a triple-dot single-electron transistor by means of pattern-dependent oxidation. The fabrication of the center dot involved quantum size effects and stress-induced band gap reduction, whereas that of the two side dots involved thickness modulation because of the complex edge structure of two-dimensional silicon. Single-electron turnstile operation was confirmed at 8 K when a 100-mV, 1-MHz square wave was applied. Monte Carlo simulations indicated that such a device with inhomogeneous tunnel and gate capacitances can exhibit single-electron transfer.

  10. Mechanism of lateral ordering of InP dots grown on InGaP layers

    SciTech Connect

    Bortoleto, J.R.R.; Gutierrez, H.R.; Cotta, M.A.; Bettini, J.

    2005-07-04

    The mechanisms leading to the spontaneous formation of a two-dimensional array of InP/InGaP dots grown by chemical-beam epitaxy are discussed. Samples where the InGaP buffer layer was grown at different conditions were characterized by transmission electron microscopy. Our results indicate that a periodic strain field related to lateral two-dimensional compositional modulation in the InGaP buffer layer determines the dot nucleation positions during InP growth. Although the periodic strain field in the InGaP is large enough to align the InP dots, both their shape and optical properties are effectively unaltered. This result shows that compositional modulation can be used as a tool for in situ dot positioning.

  11. Transport through an impurity tunnel coupled to a Si/SiGe quantum dot

    SciTech Connect

    Foote, Ryan H. Ward, Daniel R.; Thorgrimsson, Brandur; Savage, D. E.; Friesen, Mark; Coppersmith, S. N.; Eriksson, M. A.; Prance, J. R.; Gamble, John King; Nielsen, Erik; Saraiva, A. L.

    2015-09-07

    Achieving controllable coupling of dopants in silicon is crucial for operating donor-based qubit devices, but it is difficult because of the small size of donor-bound electron wavefunctions. Here, we report the characterization of a quantum dot coupled to a localized electronic state and present evidence of controllable coupling between the quantum dot and the localized state. A set of measurements of transport through the device enable the determination that the most likely location of the localized state is consistent with a location in the quantum well near the edge of the quantum dot. Our results are consistent with a gate-voltage controllable tunnel coupling, which is an important building block for hybrid donor and gate-defined quantum dot devices.

  12. Exciton dissociation and interdot transport in CdSe quantum-dot molecules

    SciTech Connect

    Franceschetti, Alberto; Zunger, Alex

    2001-04-15

    One of the most important parameters that determine the transport properties of a quantum dot array is the exciton dissociation energy, i.e., the energy {Delta}E required to dissociate an exciton into an electron and a hole localized in different dots. We show that a pseudopotential calculation for a dot molecule, coupled with a basic configuration interaction calculation of the exciton energy levels, provides directly the exciton dissociation energy, including the effects of wave function overlap, screened Coulomb attraction between the electron and the hole in different dots, and polarization effects. We find that {Delta}E decreases as the interdot distance decreases and as the dielectric constant of the medium increases.

  13. Catalytic site remodelling of the DOT1L methyltransferase by selective inhibitors

    SciTech Connect

    Yu, Wenyu; Chory, Emma J.; Wernimont, Amy K.; Tempel, Wolfram; Scopton, Alex; Federation, Alexander; Marineau, Jason J.; Qi, Jun; Barsyte-Lovejoy, Dalia; Yi, Joanna; Marcellus, Richard; Iacob, Roxana E.; Engen, John R.; Griffin, Carly; Aman, Ahmed; Wienholds, Erno; Li, Fengling; Pineda, Javier; Estiu, Guillermina; Shatseva, Tatiana; Hajian, Taraneh; Al-awar, Rima; Dick, John E.; Vedadi, Masoud; Brown, Peter J.; Arrowsmith, Cheryl H.; Bradner, James E.; Schapira, Matthieu

    2012-12-18

    Selective inhibition of protein methyltransferases is a promising new approach to drug discovery. An attractive strategy towards this goal is the development of compounds that selectively inhibit binding of the cofactor, S-adenosylmethionine, within specific protein methyltransferases. Here we report the three-dimensional structure of the protein methyltransferase DOT1L bound toEPZ004777, the first S-adenosylmethionine-competitive inhibitor of a protein methyltransferase with in vivo efficacy. This structure and those of four new analogues reveal remodelling of the catalytic site. EPZ004777 and a brominated analogue, SGC0946, inhibit DOT1L in vitro and selectively kill mixed lineage leukaemia cells, in which DOT1L is aberrantly localized via interaction with an oncogenic MLL fusion protein. These data provide important new insight into mechanisms of cell-active S-adenosylmethionine-competitive protein methyltransferase inhibitors, and establish a foundation for the further development of drug-like inhibitors of DOT1L for cancer therapy.

  14. Observation of the Kondo effect in a spin-3/2 hole quantum dot...

    Office of Scientific and Technical Information (OSTI)

    Citation Details In-Document Search Title: Observation of the Kondo effect in a spin-32 hole quantum dot We report the ... OSTI Identifier: 22261852 Resource Type: Journal Article ...

  15. TxDOT - Right of Way Forms webpage | Open Energy Information

    OpenEI (Open Energy Information) [EERE & EIA]

    Right of Way Forms webpage Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: TxDOT - Right of Way Forms webpage Abstract This webpage provides the...

  16. Quantum Dots Promise to Significantly Boost Solar Cell Efficiencies (Fact Sheet)

    SciTech Connect

    Not Available

    2013-08-01

    In the search for a third generation of solar-cell technologies, a leading candidate is the use of 'quantum dots' -- tiny spheres of semiconductor material measuring only about 2-10 billionths of a meter in diameter. Quantum dots have the potential to dramatically increase the efficiency of converting sunlight into energy -- perhaps even doubling it in some devices -- because of their ability to generate more than one bound electron-hole pair, or exciton, per incoming photon. NREL has produced quantum dots using colloidal suspensions; then, using molecular self-assembly, they have been fabricated into the first-ever quantum-dot solar cells. While these devices operate with only 4.4% efficiency, they demonstrate the capability for low-cost manufacturing.

  17. Pulsed laser deposition of Mn doped CdSe quantum dots for improved...

    Office of Scientific and Technical Information (OSTI)

    Pulsed laser deposition of Mn doped CdSe quantum dots for improved solar cell performance Citation Details In-Document Search Title: Pulsed laser deposition of Mn doped CdSe ...

  18. PbS and PbSe Quantum Dot Solar Cells: Ion Exchange Synthesis...

    Office of Scientific and Technical Information (OSTI)

    Solar Cells: Ion Exchange Synthesis and Metal Halide Surface Passivation for High Efficiency Devices Citation Details In-Document Search Title: PbS and PbSe Quantum Dot Solar ...

  19. Theoretical study of intraband optical transitions in conduction band of dot-in-a-well system

    SciTech Connect

    Chaganti, Venkata R.; Apalkov, Vadym

    2014-02-15

    We study numerically absorption optical spectra of n-doped InAs/In{sub 015}Ga{sub 085}As/GaAs quantum dot-in-a-well systems. The absorption spectra are mainly determined by the size of a quantum dot and have weak dependence on the thickness of quantum well and position of the dot in a well. The dot-in-a-well system is sensitive to both in-plane and out-of-plane polarizations of the incident light with much stronger absorption intensities for the in-plane-polarized light. The absorption spectrum of in-plane-polarized light has also a multi-peak structure with two or three peaks of comparable intensities, while the absorption spectrum of out-of-plane polarized light has a single well-pronounced peak.

  20. Interactions between N-acetyl-L-cysteine protected CdTe quantum dots and doxorubicin through spectroscopic method

    SciTech Connect

    Yang, Xiupei; Lin, Jia; Liao, Xiulin; Zong, Yingying; Gao, Huanhuan

    2015-06-15

    Highlights: • CdTe quantum dots with the diameter of 3–5 nm were synthesized in aqueous solution. • The modified CdTe quantum dots showed well fluorescence properties. • The interaction between the CdTe quantum dots and doxorubicin (DR) was investigated. - Abstract: N-acetyl-L-cysteine protected cadmium telluride quantum dots with a diameter of 3–5 nm were synthesized in aqueous solution. The interaction between N-acetyl-L-cysteine/cadmium telluride quantum dots and doxorubicin was investigated by ultraviolet–visible absorption and fluorescence spectroscopy at physiological conditions (pH 7.2, 37 °C). The results indicate that electron transfer has occurred between N-acetyl-L-cysteine/cadmium telluride quantum dots and doxorubicin under light illumination. The quantum dots react readily with doxorubicin to form a N-acetyl-L-cysteine/cadmium telluride-quantum dots/doxorubicin complex via electrostatic attraction between the −NH{sub 3}{sup +} moiety of doxorubicin and the −COO{sup −} moiety of N-acetyl-L-cysteine/cadmium telluride quantum dots. The interaction of N-acetyl-L-cysteine/cadmium telluride-quantum dots/doxorubicin complex with bovine serum albumin was studied as well, showing that the complex might induce the conformation change of bovine serum due to changes in microenvironment of bovine serum.