Multiexciton generation in seeded nanorods

Hagai Eshet*, Roi Baer, Daniel Neuhauser, Eran Rabani

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The stochastic formulation of multiexciton generation (MEG) rates is extended to provide access to MEG efficiencies in nanostructures containing thousands of atoms. The formalism is applied to a series of CdSe/CdS seeded nanorod heterostructures with different core and shell dimensions. At energies above 3Eg (where Eg is the band gap), the MEG yield increases with decreasing core size, as expected for spherical nanocrystals. Surprisingly, this behavior is reversed for energies below this value, and is explained by the dependence of the density of states near the valence band edge, which increases with the core diameter. Our predictions indicate that the onset of MEG can be shifted to lower energies by manipulating the density of states in complex nanostructure geometries.

Original languageEnglish
Pages (from-to)2580-2585
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume5
Issue number15
DOIs
StatePublished - 7 Aug 2014

Funding

FundersFunder number
U.S. Department of Energy

    Keywords

    • electronic structure
    • heterostructures
    • nanostructures
    • semiconductors
    • solar cells

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