Accounts of Chemical Research, volume 44, issue 1, pages 1-13

Unraveling the Structure and Dynamics of Excitons in Semiconductor Quantum Dots

Publication typeJournal Article
Publication date2010-10-13
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor18.3
ISSN00014842, 15204898
General Chemistry
General Medicine
Abstract
The quantum dot, one of the central materials in nanoscience, is a semiconductor crystal with a physical size on the nanometer length scale. It is often called an "artificial atom" because researchers can create nanostructures which yield properties similar to those of real atoms. By virtue of having a size in between molecules and solids, the quantum dot offers a rich palette for exploring new science and developing novel technologies. Although the physical structure of quantum dots is well known, a clear understanding of the resultant electronic structure and dynamics has remained elusive. However, because the electronic structure and dynamics of the dot, the "excitonics", confer its function in devices such as solar cells, lasers, LEDs, and nonclassical photon sources, a more complete understanding of these properties is critical for device development. In this Account, we use colloidal CdSe dots as a test bed upon which to explore four select issues in excitonic processes in quantum dots. We have developed a state-resolved spectroscopic approach which has yielded precise measurements of the electronic structural dynamics of quantum dots and has made inroads toward creating a unified picture of many of the key dynamic processes in these materials. We focus on four main topics of longstanding interest and controversy: (i) hot exciton relaxation dynamics, (ii) multiexcitons, (iii) optical gain, and (iv) exciton-phonon coupling. Using this state-resolved approach, we reconcile long standing controversies related to phenomena such as exciton cooling and exciton-phonon coupling and make surprising new observations related to optical gain and multiexcitons.

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GOST |
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GOST Copy
Kambhampati P. Unraveling the Structure and Dynamics of Excitons in Semiconductor Quantum Dots // Accounts of Chemical Research. 2010. Vol. 44. No. 1. pp. 1-13.
GOST all authors (up to 50) Copy
Kambhampati P. Unraveling the Structure and Dynamics of Excitons in Semiconductor Quantum Dots // Accounts of Chemical Research. 2010. Vol. 44. No. 1. pp. 1-13.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1021/ar1000428
UR - https://doi.org/10.1021/ar1000428
TI - Unraveling the Structure and Dynamics of Excitons in Semiconductor Quantum Dots
T2 - Accounts of Chemical Research
AU - Kambhampati, Patanjali
PY - 2010
DA - 2010/10/13 00:00:00
PB - American Chemical Society (ACS)
SP - 1-13
IS - 1
VL - 44
SN - 0001-4842
SN - 1520-4898
ER -
BibTex |
Cite this
BibTex Copy
@article{2010_Kambhampati,
author = {Patanjali Kambhampati},
title = {Unraveling the Structure and Dynamics of Excitons in Semiconductor Quantum Dots},
journal = {Accounts of Chemical Research},
year = {2010},
volume = {44},
publisher = {American Chemical Society (ACS)},
month = {oct},
url = {https://doi.org/10.1021/ar1000428},
number = {1},
pages = {1--13},
doi = {10.1021/ar1000428}
}
MLA
Cite this
MLA Copy
Kambhampati, Patanjali. “Unraveling the Structure and Dynamics of Excitons in Semiconductor Quantum Dots.” Accounts of Chemical Research, vol. 44, no. 1, Oct. 2010, pp. 1-13. https://doi.org/10.1021/ar1000428.
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