Multiexciton Generation by a Single Photon in Nanocrystals

A. Shabaev; A. L. Efros; Arthur Nozik

doi:10.1021/nl062059v

Multiexciton Generation by a Single Photon in Nanocrystals

A. Shabaev, A. L. Efros, Arthur Nozik

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

Abstract

We have theoretically shown that efficient generation of multi-electron-hole pairs by a single photon observed recently in semiconductor nanocrystals is caused by breaking the single electron approximation for carriers with kinetic energy above the effective energy gap. Due to strong Coulomb interaction, these states form a coherent superposition with charged excitons of the same energy. This concept allows us to define the conditions for dominant two-exciton generations by a single photon: the thermalization rate of a single exciton, initiated by light, should be lower than both the two-exciton state thermalization rate and the rate of Coulomb coupling between single and two exciton states. Possible experimental manifestations of our model are discussed.

Original language	American English
Pages (from-to)	2856-2863
Number of pages	8
Journal	Nano Letters
Volume	6
Issue number	12
DOIs	https://doi.org/10.1021/nl062059v
State	Published - 2006

NREL Publication Number

NREL/JA-270-41474

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10.1021/nl062059v

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abstract = "We have theoretically shown that efficient generation of multi-electron-hole pairs by a single photon observed recently in semiconductor nanocrystals is caused by breaking the single electron approximation for carriers with kinetic energy above the effective energy gap. Due to strong Coulomb interaction, these states form a coherent superposition with charged excitons of the same energy. This concept allows us to define the conditions for dominant two-exciton generations by a single photon: the thermalization rate of a single exciton, initiated by light, should be lower than both the two-exciton state thermalization rate and the rate of Coulomb coupling between single and two exciton states. Possible experimental manifestations of our model are discussed.",

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doi = "10.1021/nl062059v",

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journal = "Nano Letters",

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T1 - Multiexciton Generation by a Single Photon in Nanocrystals

AU - Shabaev, A.

AU - Efros, A. L.

AU - Nozik, Arthur

PY - 2006

Y1 - 2006

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AB - We have theoretically shown that efficient generation of multi-electron-hole pairs by a single photon observed recently in semiconductor nanocrystals is caused by breaking the single electron approximation for carriers with kinetic energy above the effective energy gap. Due to strong Coulomb interaction, these states form a coherent superposition with charged excitons of the same energy. This concept allows us to define the conditions for dominant two-exciton generations by a single photon: the thermalization rate of a single exciton, initiated by light, should be lower than both the two-exciton state thermalization rate and the rate of Coulomb coupling between single and two exciton states. Possible experimental manifestations of our model are discussed.

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U2 - 10.1021/nl062059v

DO - 10.1021/nl062059v

M3 - Article

SN - 1530-6984

VL - 6

SP - 2856

EP - 2863

JO - Nano Letters

JF - Nano Letters

IS - 12

ER -

Multiexciton Generation by a Single Photon in Nanocrystals

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