Theory of multiexciton generation in semiconductor nanocrystals

Eran Rabani*, Roi Baer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

We develop a generalized framework based on a Green's function formalism to calculate the efficiency of multiexciton generation in nanocrystal quantum dots. The direct/indirect absorption and coherent/incoherent impact ionization mechanisms, often used to describe multiexciton generation in nanocrystals, are reviewed and rederived from the unified theory as certain approximations. In addition, two new limits are described systematically - the weak Coulomb coupling limit and the semi-wide band limit. We show that the description of multiexciton generation in nanocrystals can be described as incoherent process and we discuss the scaling of multiexciton generation with respect to the photon energy and nanocrystal size. Illustrations are given for three prototype systems: CdSe, InAs and silicon quantum dots.

Original languageAmerican English
Pages (from-to)227-235
Number of pages9
JournalChemical Physics Letters
Volume496
Issue number4-6
DOIs
StatePublished - 30 Aug 2010

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