Distribution of multiexciton generation rates in CdSe and InAs nanocrystals

Eran Rabani; Roi Baer

doi:10.1021/nl802443c

Distribution of multiexciton generation rates in CdSe and InAs nanocrystals

Eran Rabani^*, Roi Baer

^*Corresponding author for this work

Institute of Chemistry

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

90 Scopus citations

Abstract

The distribution of rates of multiexciton generation following photon absorption is calculated for semiconductor nanocrystals (NCs). The rates of biexciton generation are calculated using Fermi's golden rule with all relevant Coulomb matrix elements, taking into account proper selection rules within a screened semiempirical pseudopotential approach. In CdSe and InAs NCs, we find a broad distribution of biexciton generation rates depending strongly on the exciton energy and size of the NC. Multiexciton generation becomes inefficient for NCs exceeding 3 nm in diameter in the photon energy range of 2-3 times the band gap.

Original language	English
Pages (from-to)	4488-4492
Number of pages	5
Journal	Nano Letters
Volume	8
Issue number	12
DOIs	https://doi.org/10.1021/nl802443c
State	Published - Dec 2008

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title = "Distribution of multiexciton generation rates in CdSe and InAs nanocrystals",

abstract = "The distribution of rates of multiexciton generation following photon absorption is calculated for semiconductor nanocrystals (NCs). The rates of biexciton generation are calculated using Fermi's golden rule with all relevant Coulomb matrix elements, taking into account proper selection rules within a screened semiempirical pseudopotential approach. In CdSe and InAs NCs, we find a broad distribution of biexciton generation rates depending strongly on the exciton energy and size of the NC. Multiexciton generation becomes inefficient for NCs exceeding 3 nm in diameter in the photon energy range of 2-3 times the band gap.",

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AB - The distribution of rates of multiexciton generation following photon absorption is calculated for semiconductor nanocrystals (NCs). The rates of biexciton generation are calculated using Fermi's golden rule with all relevant Coulomb matrix elements, taking into account proper selection rules within a screened semiempirical pseudopotential approach. In CdSe and InAs NCs, we find a broad distribution of biexciton generation rates depending strongly on the exciton energy and size of the NC. Multiexciton generation becomes inefficient for NCs exceeding 3 nm in diameter in the photon energy range of 2-3 times the band gap.

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Distribution of multiexciton generation rates in CdSe and InAs nanocrystals

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