Communication: Biexciton generation rates in CdSe nanorods are length independent

Roi Baer, Eran Rabani

Research output: Contribution to journalArticlepeer-review

Abstract

We study how shape affects multiexciton generation rates in a semiconducting nanocrystal by considering CdSe nanorods with varying diameters and aspect ratios. The calculations employ an atomistic semiempirical pseudopotential model combined with an efficacious stochastic approach applied to systems containing up to 20 000 atoms. The effect of nanorod diameter and aspect ratio on multiexciton generation rates is analyzed in terms of the scaling of the density of trion states and the scaling of the Coulomb couplings. Both show distinct scaling from spherical nanocrystals leading to a surprising result where the multiexciton generation rates are roughly independent of the nanorod length.

Original languageEnglish
Article number051102
JournalJournal of Chemical Physics
Volume138
Issue number5
DOIs
StatePublished - 7 Feb 2013

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