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Title: Nanoshell quantum dots: Quantum confinement beyond the exciton Bohr radius

Abstract

Nanoshell quantum dots (QDs) represent a novel class of colloidal semiconductor nanocrystals (NCs), which supports tunable optoelectronic properties over the extended range of particle sizes. Traditionally, the ability to control the bandgap of colloidal semiconductor NCs is limited to small-size nanostructures, where photoinduced charges are confined by Coulomb interactions. A notorious drawback of such a restricted size range concerns the fact that assemblies of smaller nanoparticles tend to exhibit a greater density of interfacial and surface defects. This presents a potential problem for device applications of semiconductor NCs where the charge transport across nanoparticle films is important, as in the case of solar cells, field-effect transistors, and photoelectrochemical devices. Furthermore, the morphology of nanoshell QDs addresses this issue by enabling the quantum-confinement in the shell layer, where two-dimensional excitons can exist, regardless of the total particle size. Such a geometry exhibits one of the lowest surface-to-volume ratios among existing QD architectures and, therefore, could potentially lead to improved charge-transport and multi-exciton characteristics. The expected benefits of the nanoshell architecture were recently demonstrated by a number of reports on the CdSbulk/CdSe nanoshell model system, showing an improved photoconductivity of solids and increased lifetime of multi-exciton populations. Along these lines, this perspectivemore » will summarize the recent work on CdSbulk/CdSe nanoshell colloids and discuss the possibility of employing other nanoshell semiconductor combinations in light-harvesting and lasing applications.« less

Authors:
 [1]; ORCiD logo [1]
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  1. Bowling Green State University, OH (United States). The Center for Photochemical Sciences
Publication Date:
Research Org.:
Bowling Green State Univ., OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1803092
Alternate Identifier(s):
OSTI ID: 1604830
Grant/Contract Number:  
SC0016872; DMR-1710063; SC0026872 (MZ)
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 152; Journal Issue: 11; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Charge transport; Excitons; Photoconductivity; Quantum confinement; Nanomaterials; Quantum dots; Chemical properties; Field effect transistors; Nanoparticles; Nanocrystals

Citation Formats

Cassidy, James, and Zamkov, Mikhail. Nanoshell quantum dots: Quantum confinement beyond the exciton Bohr radius. United States: N. p., 2020. Web. doi:10.1063/1.5126423.
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Cassidy, James, & Zamkov, Mikhail. Nanoshell quantum dots: Quantum confinement beyond the exciton Bohr radius. United States. https://doi.org/10.1063/1.5126423
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Cassidy, James, and Zamkov, Mikhail. Sat . "Nanoshell quantum dots: Quantum confinement beyond the exciton Bohr radius". United States. https://doi.org/10.1063/1.5126423. https://www.osti.gov/servlets/purl/1803092.
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@article{osti_1803092,
title = {Nanoshell quantum dots: Quantum confinement beyond the exciton Bohr radius},
author = {Cassidy, James and Zamkov, Mikhail},
abstractNote = {Nanoshell quantum dots (QDs) represent a novel class of colloidal semiconductor nanocrystals (NCs), which supports tunable optoelectronic properties over the extended range of particle sizes. Traditionally, the ability to control the bandgap of colloidal semiconductor NCs is limited to small-size nanostructures, where photoinduced charges are confined by Coulomb interactions. A notorious drawback of such a restricted size range concerns the fact that assemblies of smaller nanoparticles tend to exhibit a greater density of interfacial and surface defects. This presents a potential problem for device applications of semiconductor NCs where the charge transport across nanoparticle films is important, as in the case of solar cells, field-effect transistors, and photoelectrochemical devices. Furthermore, the morphology of nanoshell QDs addresses this issue by enabling the quantum-confinement in the shell layer, where two-dimensional excitons can exist, regardless of the total particle size. Such a geometry exhibits one of the lowest surface-to-volume ratios among existing QD architectures and, therefore, could potentially lead to improved charge-transport and multi-exciton characteristics. The expected benefits of the nanoshell architecture were recently demonstrated by a number of reports on the CdSbulk/CdSe nanoshell model system, showing an improved photoconductivity of solids and increased lifetime of multi-exciton populations. Along these lines, this perspective will summarize the recent work on CdSbulk/CdSe nanoshell colloids and discuss the possibility of employing other nanoshell semiconductor combinations in light-harvesting and lasing applications.},
doi = {10.1063/1.5126423},
journal = {Journal of Chemical Physics},
number = 11,
volume = 152,
place = {United States},
year = {Sat Mar 21 00:00:00 EDT 2020},
month = {Sat Mar 21 00:00:00 EDT 2020}
}
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journal, September 2010

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  • Nano Letters, Vol. 10, Issue 9, p. 3670-3674
  • DOI: 10.1021/nl102135k

Quasi 2D Colloidal CdSe Platelets with Thicknesses Controlled at the Atomic Level
journal, December 2008

  • Ithurria, Sandrine; Dubertret, Benoit
  • Journal of the American Chemical Society, Vol. 130, Issue 49
  • DOI: 10.1021/ja807724e

Variation of the Thickness and Number of Wells in the CdS/HgS/CdS Quantum Dot Quantum Well System †
journal, June 2001

  • Braun, Markus; Burda, Clemens; El-Sayed, Mostafa A.
  • The Journal of Physical Chemistry A, Vol. 105, Issue 23
  • DOI: 10.1021/jp010002l

Direct observation of triplet energy transfer from semiconductor nanocrystals
journal, January 2016

Synthesis and Micrometer-Scale Assembly of Colloidal CdSe/CdS Nanorods Prepared by a Seeded Growth Approach
journal, October 2007

  • Carbone, Luigi; Nobile, Concetta; De Giorgi, Milena
  • Nano Letters, Vol. 7, Issue 10
  • DOI: 10.1021/nl0717661

Understanding and Exploiting the Interface of Semiconductor Nanocrystals for Light Emissive Applications
journal, February 2017

Single Dot Spectroscopy of Two-Color Quantum Dot/Quantum Shell Nanostructures
journal, July 2008

  • Dias, Eva A.; Grimes, Amy F.; English, Douglas S.
  • The Journal of Physical Chemistry C, Vol. 112, Issue 37
  • DOI: 10.1021/jp806621q

Tailoring the Inherent Optical and Electrical Properties of Nanostructures
journal, October 2014

  • Kuno, Masaru
  • The Journal of Physical Chemistry Letters, Vol. 5, Issue 21
  • DOI: 10.1021/jz502041a
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