Multiple Exciton Generation in Semiconductor Quantum Dots

Arthur J. Nozik

doi:10.1016/j.cplett.2008.03.094

Multiple Exciton Generation in Semiconductor Quantum Dots

Arthur J. Nozik

Chemistry and Nanoscience

Research output: Contribution to journal › Article › peer-review

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Abstract

A review is presented of recent work on (1) the origin of the concept of enhanced multiple electron-hole pair (i.e. exciton) production in semiconductor quantum dots (QDs), (2) various experiments based on time-resolved fs to ns spectroscopy (transient IR absorption, transient visible to near-IR bleaching due to state filling, terahertz spectroscopy, and time-resolved photoluminescence) that support the occurrence of highly efficient multiple exciton generation (MEG) in QDs, (3) thermodynamic analyses of the theoretical enhancement of the conversion efficiency in solar cells that are based on MEG in QDs, (4) MEG in QD arrays that can be used in QD solar cells, (5) theoretical models to explain MEG, and (6) some recent controversy about the evidence for MEG.

Original language	American English
Pages (from-to)	3-11
Number of pages	9
Journal	Chemical Physics Letters
Volume	457
Issue number	1-3
DOIs	https://doi.org/10.1016/j.cplett.2008.03.094 https://doi.org/10.1016/j.cplett.2008.03.094
State	Published - 2008

NREL Publication Number

NREL/JA-100-42889

Keywords

conversion efficiency
quantum dots
semiconductors

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AB - A review is presented of recent work on (1) the origin of the concept of enhanced multiple electron-hole pair (i.e. exciton) production in semiconductor quantum dots (QDs), (2) various experiments based on time-resolved fs to ns spectroscopy (transient IR absorption, transient visible to near-IR bleaching due to state filling, terahertz spectroscopy, and time-resolved photoluminescence) that support the occurrence of highly efficient multiple exciton generation (MEG) in QDs, (3) thermodynamic analyses of the theoretical enhancement of the conversion efficiency in solar cells that are based on MEG in QDs, (4) MEG in QD arrays that can be used in QD solar cells, (5) theoretical models to explain MEG, and (6) some recent controversy about the evidence for MEG.

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KW - quantum dots

KW - semiconductors

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Multiple Exciton Generation in Semiconductor Quantum Dots

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Keywords

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