DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Hot phonon and carrier relaxation in Si(100) determined by transient extreme ultraviolet spectroscopy

Abstract

The thermalization of hot carriers and phonons gives direct insight into the scattering processes that mediate electrical and thermal transport. Obtaining the scattering rates for both hot carriers and phonons currently requires multiple measurements with incommensurate timescales. Here, transient extreme-ultraviolet (XUV) spectroscopy on the silicon 2p core level at 100 eV is used to measure hot carrier and phonon thermalization in Si(100) from tens of femtoseconds to 200 ps, following photoexcitation of the indirect transition to the Δ valley at 800 nm. The ground state XUV spectrum is first theoretically predicted using a combination of a single plasmon pole model and the Bethe-Salpeter equation with density functional theory. The excited state spectrum is predicted by incorporating the electronic effects of photo-induced state-filling, broadening, and band-gap renormalization into the ground state XUV spectrum. A time-dependent lattice deformation and expansion is also required to describe the excited state spectrum. The kinetics of these structural components match the kinetics of phonons excited from the electron-phonon and phonon-phonon scattering processes following photoexcitation. Finally, separating the contributions of electronic and structural effects on the transient XUV spectra allows the carrier population, the population of phonons involved in inter- and intra-valley electron-phonon scattering, and the populationmore » of phonons involved in phonon-phonon scattering to be quantified as a function of delay time.« less

Authors:
 [1];  [2];  [2];  [1];  [2];  [2];  [2];  [3]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
  3. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry and Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Swiss National Science Foundation (SNSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; Humboldt Foundation; Army Research Office (ARO); US Air Force Office of Scientific Research (AFOSR); Defense Advanced Research Projects Agency (DARPA)
OSTI Identifier:
1506355
Alternate Identifier(s):
OSTI ID: 1469433
Grant/Contract Number:  
AC02-05CH11231; W31P4Q-13-1-0017
Resource Type:
Accepted Manuscript
Journal Name:
Structural Dynamics
Additional Journal Information:
Journal Volume: 5; Journal Issue: 5; Journal ID: ISSN 2329-7778
Publisher:
American Crystallographic Association/AIP
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Cushing, Scott K., Zürch, Michael, Kraus, Peter M., Carneiro, Lucas M., Lee, Angela, Chang, Hung-Tzu, Kaplan, Christopher J., and Leone, Stephen R. Hot phonon and carrier relaxation in Si(100) determined by transient extreme ultraviolet spectroscopy. United States: N. p., 2018. Web. doi:10.1063/1.5038015.
Cushing, Scott K., Zürch, Michael, Kraus, Peter M., Carneiro, Lucas M., Lee, Angela, Chang, Hung-Tzu, Kaplan, Christopher J., & Leone, Stephen R. Hot phonon and carrier relaxation in Si(100) determined by transient extreme ultraviolet spectroscopy. United States. https://doi.org/10.1063/1.5038015
Cushing, Scott K., Zürch, Michael, Kraus, Peter M., Carneiro, Lucas M., Lee, Angela, Chang, Hung-Tzu, Kaplan, Christopher J., and Leone, Stephen R. Tue . "Hot phonon and carrier relaxation in Si(100) determined by transient extreme ultraviolet spectroscopy". United States. https://doi.org/10.1063/1.5038015. https://www.osti.gov/servlets/purl/1506355.
@article{osti_1506355,
title = {Hot phonon and carrier relaxation in Si(100) determined by transient extreme ultraviolet spectroscopy},
author = {Cushing, Scott K. and Zürch, Michael and Kraus, Peter M. and Carneiro, Lucas M. and Lee, Angela and Chang, Hung-Tzu and Kaplan, Christopher J. and Leone, Stephen R.},
abstractNote = {The thermalization of hot carriers and phonons gives direct insight into the scattering processes that mediate electrical and thermal transport. Obtaining the scattering rates for both hot carriers and phonons currently requires multiple measurements with incommensurate timescales. Here, transient extreme-ultraviolet (XUV) spectroscopy on the silicon 2p core level at 100 eV is used to measure hot carrier and phonon thermalization in Si(100) from tens of femtoseconds to 200 ps, following photoexcitation of the indirect transition to the Δ valley at 800 nm. The ground state XUV spectrum is first theoretically predicted using a combination of a single plasmon pole model and the Bethe-Salpeter equation with density functional theory. The excited state spectrum is predicted by incorporating the electronic effects of photo-induced state-filling, broadening, and band-gap renormalization into the ground state XUV spectrum. A time-dependent lattice deformation and expansion is also required to describe the excited state spectrum. The kinetics of these structural components match the kinetics of phonons excited from the electron-phonon and phonon-phonon scattering processes following photoexcitation. Finally, separating the contributions of electronic and structural effects on the transient XUV spectra allows the carrier population, the population of phonons involved in inter- and intra-valley electron-phonon scattering, and the population of phonons involved in phonon-phonon scattering to be quantified as a function of delay time.},
doi = {10.1063/1.5038015},
journal = {Structural Dynamics},
number = 5,
volume = 5,
place = {United States},
year = {Tue Sep 11 00:00:00 EDT 2018},
month = {Tue Sep 11 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1. FIG. 1.: Critical points and core-hole modification of the spectrum of the Si 2p L23 edge. (a) Band structure of silicon along the L-C-X path, highlighting the $\Delta$1, L1, and L3 critical points. The k-space directions are marked. Note L is at $^1_2, ^1_ 2 ,^1_ 2$ and $\Delta$ ismore » at ~0.8,0,0 in the Brillouin zone. The excitation wavelength and an example core level transition are marked as arrows. The arrow length is adjusted for the underestimation of the band gap in the DFT calculation. (b) Comparison of the sþ d projected density of states (DOS, grey), core-hole modified DOS (dark grey), experimental absorption (blue), and theoretical absorption (dashed) predicted by the core-hole modified DOS broadened with a single plasmon pole model. The 2p core-hole exciton renormalizes the L1 and $\Delta$1 s-p hybridized critical points, while having less effect on the higher lying, dcharacter L3 critical point.« less

Save / Share:

Works referenced in this record:

Band-gap narrowing in heavily doped many-valley semiconductors
journal, August 1981


Ultrafast Spectroscopy of Semiconductors and Semiconductor Nanostructures
book, January 1999


Effects of high carrier densities on phonon and carrier lifetimes in Si by time-resolved anti-Stokes Raman scattering
journal, June 2007

  • Letcher, Jeffrey J.; Kang, Kwangu; Cahill, David G.
  • Applied Physics Letters, Vol. 90, Issue 25
  • DOI: 10.1063/1.2749728

Carrier Relaxation and Lattice Heating Dynamics in Silicon Revealed by Femtosecond Electron Diffraction
journal, December 2006

  • Harb, Maher; Ernstorfer, Ralph; Dartigalongue, Thibault
  • The Journal of Physical Chemistry B, Vol. 110, Issue 50
  • DOI: 10.1021/jp064649n

Many-pole model of inelastic losses in x-ray absorption spectra
journal, November 2007


Extended two-temperature model for ultrafast thermal response of band gap materials upon impulsive optical excitation
journal, November 2015

  • Shin, Taeho; Teitelbaum, Samuel W.; Wolfson, Johanna
  • The Journal of Chemical Physics, Vol. 143, Issue 19
  • DOI: 10.1063/1.4935366

Momentum-Dependent Lifetime Broadening of Electron Energy Loss Spectra: A Self-Consistent Coupled-Plasmon Model
journal, January 2015

  • Bourke, J. D.; Chantler, C. T.
  • The Journal of Physical Chemistry Letters, Vol. 6, Issue 3
  • DOI: 10.1021/jz5023812

QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials
journal, September 2009

  • Giannozzi, Paolo; Baroni, Stefano; Bonini, Nicola
  • Journal of Physics: Condensed Matter, Vol. 21, Issue 39, Article No. 395502
  • DOI: 10.1088/0953-8984/21/39/395502

Thermal Conductivity of Silicon from 300 to 1400°K
journal, June 1963


Deconvolution problems in x-ray absorption fine structure spectroscopy
journal, July 2001


Dielectric loss function of Si and SiO2 from quantitative analysis of REELS spectra
journal, July 1993

  • Yubero, F.; Tougaard, S.; Elizalde, E.
  • Surface and Interface Analysis, Vol. 20, Issue 8
  • DOI: 10.1002/sia.740200817

Ultrafast dynamics of laser-excited electron distributions in silicon
journal, February 1994


Electron Small Polarons and Their Mobility in Iron (Oxyhydr)oxide Nanoparticles
journal, September 2012


The birth of a quasiparticle in silicon observed in time–frequency space
journal, November 2003

  • Hase, Muneaki; Kitajima, Masahiro; Constantinescu, Anca Monia
  • Nature, Vol. 426, Issue 6962
  • DOI: 10.1038/nature02044

The Electronic Contribution to the Elastic Properties of Germanium
journal, October 1961

  • Keyes, R. W.
  • IBM Journal of Research and Development, Vol. 5, Issue 4
  • DOI: 10.1147/rd.54.0266

Core-hole effects in the x-ray-absorption spectra of transition-metal silicides
journal, June 1990


Nanosecond resolution time-resolved x-ray study of silicon during pulsed-laser irradiation
journal, February 1986

  • Larson, B. C.; Tischler, J. Z.; Mills, D. M.
  • Journal of Materials Research, Vol. 1, Issue 1
  • DOI: 10.1557/JMR.1986.0144

Self-consistent optical parameters of intrinsic silicon at 300K including temperature coefficients
journal, November 2008


Photoexcited carrier diffusion near a Si(111) surface: Non-negligible consequence of carrier-carrier scattering
journal, December 1997


Influence of lattice heating time on femtosecond laser-induced strain waves in InSb
journal, November 2008


Surface generation and detection of phonons by picosecond light pulses
journal, September 1986


Effect of Carrier Concentration on the Raman Frequencies of Si and Ge
journal, February 1972


Probing the transition state region in catalytic CO oxidation on Ru
journal, February 2015


Transient electronic and magnetic structures of nickel heated by ultrafast laser pulses
journal, September 2009


Ultrafast carrier diffusion in gallium arsenide probed with picosecond acoustic pulses
journal, August 2001


Coherent Shear Phonon Generation and Detection with Ultrashort Optical Pulses
journal, August 2004


Electron–Phonon Interaction in n-Si
journal, January 1981


Relationships between strain and band structure in Si(001) and Si(110) nanomembranes
journal, September 2009


Excitation of longitudinal and transverse coherent acoustic phonons in nanometer free-standing films of (001) Si
journal, March 2009


Nonequilibrium optical properties in semiconductors from first principles: A combined theoretical and experimental study of bulk silicon
journal, May 2016


Bethe-Salpeter equation calculations of core excitation spectra
journal, March 2011


Ab initio calculation of phonon dispersions in semiconductors
journal, March 1991

  • Giannozzi, Paolo; de Gironcoli, Stefano; Pavone, Pasquale
  • Physical Review B, Vol. 43, Issue 9
  • DOI: 10.1103/PhysRevB.43.7231

X-ray absorption spectra: K-edges of 3d transition metals, L-edges of 3d and 4d metals, and M-edges of palladium
journal, May 1982


Selection rules for indirect transitions and effect of time reversal symmetry
journal, October 1973


Theory of optical spin orientation in silicon
journal, April 2011


Picosecond acoustic response of a laser-heated gold-film studied with time-resolved x-ray diffraction
journal, May 2011

  • Nicoul, Matthieu; Shymanovich, Uladzimir; Tarasevitch, Alexander
  • Applied Physics Letters, Vol. 98, Issue 19
  • DOI: 10.1063/1.3584864

Real-time observation of valence electron motion
journal, August 2010

  • Goulielmakis, Eleftherios; Loh, Zhi-Heng; Wirth, Adrian
  • Nature, Vol. 466, Issue 7307
  • DOI: 10.1038/nature09212

Two-photon absorption and Kerr coefficients of silicon for 850–2200nm
journal, May 2007

  • Bristow, Alan D.; Rotenberg, Nir; van Driel, Henry M.
  • Applied Physics Letters, Vol. 90, Issue 19
  • DOI: 10.1063/1.2737359

Spatially-resolved X-ray Absorption Near-edge Spectroscopy of Silicon in Thin Silicon-oxide Films
journal, January 1990


Band gap renormalization and Burstein-Moss effect in silicon- and germanium-doped wurtzite GaN up to 10 20   cm 3
journal, August 2014


Dynamical theory of the laser-induced lattice instability of silicon
journal, November 1992


Generation and detection of plane coherent shear picosecond acoustic pulses by lasers: Experiment and theory
journal, May 2007


Core Level Spectroscopy of Solids
book, January 2008


A semiclassical two-temperature model for ultrafast laser heating
journal, January 2006


Strained Si, Ge, and Si 1 x Ge x alloys modeled with a first-principles-optimized full-zone k p method
journal, November 2006


Photochemical Processes Revealed by X-ray Transient Absorption Spectroscopy
journal, November 2013

  • Chen, Lin X.; Zhang, Xiaoyi
  • The Journal of Physical Chemistry Letters, Vol. 4, Issue 22
  • DOI: 10.1021/jz401750g

Improved quantitative description of Auger recombination in crystalline silicon
journal, October 2012


Dipole selection rules for optical transitions in the fcc and bcc lattices
journal, June 1980


Local screening of a core hole: A real-space approach applied to hafnium oxide
journal, October 2006


Picosecond transient orientational and concentration gratings in germanium
journal, April 1983

  • Smirl, A.; Boggess, T.; Wherrett, B.
  • IEEE Journal of Quantum Electronics, Vol. 19, Issue 4
  • DOI: 10.1109/JQE.1983.1071920

Electronic Dilation in Germanium and Silicon
journal, November 1969


Attosecond band-gap dynamics in silicon
journal, December 2014


New model dielectric function and exchange-correlation potential for semiconductors and insulators
journal, May 1982


Time-Resolved X-Ray Diffraction from Coherent Phonons during a Laser-Induced Phase Transition
journal, January 2000


Interference between extrinsic and intrinsic losses in x-ray absorption fine structure
journal, January 2002


Characterization of vibrational wave packets by core-level high-harmonic transient absorption spectroscopy
journal, August 2013


Stress and thermal expansion of boron‐doped silicon membranes on silicon substrates
journal, July 1991

  • Berry, B. S.; Pritchet, W. C.
  • Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 9, Issue 4
  • DOI: 10.1116/1.577300

Thermal and nonthermal melting of silicon under femtosecond x-ray irradiation
journal, February 2015


Generation of dense electron-hole plasmas in silicon
journal, January 2000


Natural widths of atomic K and L levels, K α X‐ray lines and several K L L Auger lines
journal, April 1979

  • Krause, M. O.; Oliver, J. H.
  • Journal of Physical and Chemical Reference Data, Vol. 8, Issue 2
  • DOI: 10.1063/1.555595

Photostriction effect in silicon observed by time-resolved x-ray diffraction
journal, November 1991


Self-energy in surface electron spectroscopy: I. Plasmons on a free-electron-material surface
journal, March 1998


Short-range deformation-potential interaction and its application to ultrafast processes in semiconductors
journal, March 1992


Band‐gap narrowing in heavily doped silicon: A comparison of optical and electrical data
journal, January 1988

  • Wagner, Joachim; del Alamo, Jesús A.
  • Journal of Applied Physics, Vol. 63, Issue 2
  • DOI: 10.1063/1.340257

Influence of Strain on the Conduction Band Structure of Strained Silicon Nanomembranes
journal, October 2008


Precise determination of lattice parameter and thermal expansion coefficient of silicon between 300 and 1500 K
journal, July 1984

  • Okada, Yasumasa; Tokumaru, Yozo
  • Journal of Applied Physics, Vol. 56, Issue 2, p. 314-320
  • DOI: 10.1063/1.333965

Observation of Hot-Electron Pressure in the Vibration Dynamics of Metal Nanoparticles
journal, July 2000


Efficient implementation of core-excitation Bethe–Salpeter equation calculations
journal, December 2015


Preablation electron and lattice dynamics on the silicon surface excited by a femtosecond laser pulse
journal, November 2015

  • Ionin, A. A.; Kudryashov, S. I.; Seleznev, L. V.
  • Journal of Experimental and Theoretical Physics, Vol. 121, Issue 5
  • DOI: 10.1134/S106377611511014X

Electron–phonon interaction in tetrahedral semiconductors
journal, January 2005


Ultra-fast carriers relaxation in bulk silicon following photo-excitation with a short and polarized laser pulse
journal, May 2015


Self-consistent aspects of x-ray absorption calculations
journal, August 2009


Ab initio calculation of thermodynamic properties of silicon
journal, November 1994


L 2 , 3 threshold spectra of doped silicon and silicon compounds
journal, May 1977

  • Brown, Frederick C.; Bachrach, R. Z.; Skibowski, M.
  • Physical Review B, Vol. 15, Issue 10
  • DOI: 10.1103/PhysRevB.15.4781

Electron-Phonon Coupling and Energy Flow in a Simple Metal beyond the Two-Temperature Approximation
journal, April 2016


Energy dissipation and transport in nanoscale devices
journal, March 2010


Role of the plasmon-pole model in the G W approximation
journal, September 2013


Rippled area formed by surface plasmon polaritons upon femtosecond laser double-pulse irradiation of silicon
journal, January 2013

  • Derrien, Thibault J. -Y.; Krüger, Jörg; Itina, Tatiana E.
  • Optics Express, Vol. 21, Issue 24
  • DOI: 10.1364/OE.21.029643

Ab initio evidence for nonthermal characteristics in ultrafast laser melting
journal, November 2016


X-Ray Interactions: Photoabsorption, Scattering, Transmission, and Reflection at E = 50-30,000 eV, Z = 1-92
journal, July 1993

  • Henke, B. L.; Gullikson, E. M.; Davis, J. C.
  • Atomic Data and Nuclear Data Tables, Vol. 54, Issue 2, p. 181-342
  • DOI: 10.1006/adnd.1993.1013

GW self-energy calculations of carrier-induced band-gap narrowing in n -type silicon
journal, January 1995


Hot carrier solar cells: Principles, materials and design
journal, September 2010

  • König, D.; Casalenuovo, K.; Takeda, Y.
  • Physica E: Low-dimensional Systems and Nanostructures, Vol. 42, Issue 10
  • DOI: 10.1016/j.physe.2009.12.032

Femtosecond pump-probe reflectivity study of silicon carrier dynamics
journal, October 2002


Full band structure calculation of two-photon indirect absorption in bulk silicon
journal, March 2011

  • Cheng, J. L.; Rioux, J.; Sipe, J. E.
  • Applied Physics Letters, Vol. 98, Issue 13
  • DOI: 10.1063/1.3570654

Physical mechanisms of coherent acoustic phonons generation by ultrafast laser action
journal, February 2015


What is the Young's Modulus of Silicon?
journal, April 2010

  • Hopcroft, Matthew A.; Nix, William D.; Kenny, Thomas W.
  • Journal of Microelectromechanical Systems, Vol. 19, Issue 2
  • DOI: 10.1109/JMEMS.2009.2039697

Ultrafast Carrier Dynamics in Silicon: A Two-Color Transient Reflection Grating Study on a ( 111 ) Surface
journal, December 1998


Theory of the Band Structure of Very Degenerate Semiconductors
journal, April 1962


Effect of Free Carriers on Zone-Center Vibrational Modes in Heavily Doped p -type Si. II. Optical Modes
journal, November 1973


Electronically Driven Structure Changes of Si Captured by Femtosecond Electron Diffraction
journal, April 2008


Quasimomentum-Space Image for Ultrafast Melting of Silicon
journal, April 2016


Carrier-induced change in refractive index of InP, GaAs and InGaAsP
journal, January 1990

  • Bennett, B. R.; Soref, R. A.; Del Alamo, J. A.
  • IEEE Journal of Quantum Electronics, Vol. 26, Issue 1
  • DOI: 10.1109/3.44924

Electronic Volume Effect in Silicon
journal, June 1967


Suppression of driving laser in high harmonic generation with a microchannel plate
journal, January 2014


Bulk nanostructured thermoelectric materials: current research and future prospects
journal, January 2009

  • Minnich, A. J.; Dresselhaus, M. S.; Ren, Z. F.
  • Energy & Environmental Science, Vol. 2, Issue 5
  • DOI: 10.1039/b822664b

Intense few-cycle laser fields: Frontiers of nonlinear optics
journal, April 2000


Electron inelastic mean free path for Ti, TiC, TiN and TiO2 as determined by quantitative reflection electron energy-loss spectroscopy
journal, January 2002

  • Fuentes, G. G.; Elizalde, E.; Yubero, F.
  • Surface and Interface Analysis, Vol. 33, Issue 3
  • DOI: 10.1002/sia.1205

Atomic and Electronic Structure of a Dissociated 60° Misfit Dislocation in Ge x Si ( 1 x )
journal, November 1999


Signatures of nonthermal melting
journal, August 2015

  • Zier, Tobias; Zijlstra, Eeuwe S.; Kalitsov, Alan
  • Structural Dynamics, Vol. 2, Issue 5
  • DOI: 10.1063/1.4928686

Kinetics of high-density plasmas generated in Si by 1.06- and 0.53- μm picosecond laser pulses
journal, May 1987


Band gap narrowing due to many-body effects in silicon and gallium arsenide
journal, December 1984

  • Abram, R. A.; Childs, G. N.; Saunderson, P. A.
  • Journal of Physics C: Solid State Physics, Vol. 17, Issue 34
  • DOI: 10.1088/0022-3719/17/34/012

Femtosecond Orientational Relaxation of Photoexcited Carriers in GaAs
journal, July 1984


Femtosecond Orientational Relaxation of Photoexcited Carriers in GaAs
journal, November 1984


Bethe-Salpeter Equation Calculations of Core Excitation Spectra
text, January 2010


Efficient implementation of core-excitation Bethe Salpeter equation calculations
text, January 2016


Intrinsic coherent acoustic phonons in indirect band gap semiconductors Si and GaP
text, January 2016


Physical mechanisms of coherent acoustic phonons generation by ultrafast laser action
journal, February 2015


Carrier Relaxation and Lattice Heating Dynamics in Silicon Revealed by Femtosecond Electron Diffraction
journal, December 2006

  • Harb, Maher; Ernstorfer, Ralph; Dartigalongue, Thibault
  • The Journal of Physical Chemistry B, Vol. 110, Issue 50
  • DOI: 10.1021/jp064649n

Precise determination of lattice parameter and thermal expansion coefficient of silicon between 300 and 1500 K
journal, July 1984

  • Okada, Yasumasa; Tokumaru, Yozo
  • Journal of Applied Physics, Vol. 56, Issue 2, p. 314-320
  • DOI: 10.1063/1.333965

Full band structure calculation of two-photon indirect absorption in bulk silicon
journal, March 2011

  • Cheng, J. L.; Rioux, J.; Sipe, J. E.
  • Applied Physics Letters, Vol. 98, Issue 13
  • DOI: 10.1063/1.3570654

Self-consistent aspects of x-ray absorption calculations
journal, August 2009


Deformation Potentials in Silicon. III. Effects of a General Strain on Conduction and Valence Levels
journal, November 1963


Works referencing / citing this record:

Nonlinear XUV-optical transient grating spectroscopy at the Si L 2,3 –edge
journal, May 2019

  • Bohinc, R.; Pamfilidis, G.; Rehault, J.
  • Applied Physics Letters, Vol. 114, Issue 18
  • DOI: 10.1063/1.5085413

Ultrafast relaxation dynamics of highly excited hot electrons in silicon
journal, July 2019


Transient absorption spectroscopy using high harmonic generation: a review of ultrafast X-ray dynamics in molecules and solids
journal, April 2019

  • Geneaux, Romain; Marroux, Hugo J. B.; Guggenmos, Alexander
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2145
  • DOI: 10.1098/rsta.2017.0463

“Hot electrons in Si lose energy mostly to optical phonons”: Truth or myth?
journal, June 2019

  • Fischetti, M. V.; Yoder, P. D.; Khatami, M. M.
  • Applied Physics Letters, Vol. 114, Issue 22
  • DOI: 10.1063/1.5099914

The Way to Pursue Truly High-Performance Perovskite Solar Cells
journal, September 2019


Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.