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Proceedings Paper

Controlling interfacial charge separation and recombination dynamics in QDs by wave function engineering
Author(s): Haiming Zhu; Ye Yang; Nianhui Song; William Rodríguez-Cordoba; Tianquan Lian
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Paper Abstract

In addition to the size dependent optical and electronic properties of semiconductor quantum dots (QDs), quantum confinement also affects the charge separation and recombination dynamics in QD - charge acceptor complexes. It leads to enhanced amplitudes of electron and hole wave functions at the surface, enabling ultrafast interfacial charge transfer, an important property for the application of QDs in photovoltaic and photocatalytic devices. In this proceeding, we show that both charge separation and recombination are ultrafast in strongly quantum confined PbS QDs adsorbed with electron acceptors. Using CdSe/ZnS type I and CdTe/CdSe type II core/shell QDs as model systems, we show that the spatial distributions of electron and wave functions can be optimized to simultaneously achieve ultrafast charge separation and retard charge recombination.

Paper Details

Date Published: 16 September 2011
PDF: 8 pages
Proc. SPIE 8098, Physical Chemistry of Interfaces and Nanomaterials X, 809802 (16 September 2011); doi: 10.1117/12.892873
Show Author Affiliations
Haiming Zhu, Emory Univ. (United States)
Ye Yang, Emory Univ. (United States)
Nianhui Song, Emory Univ. (United States)
William Rodríguez-Cordoba, Emory Univ. (United States)
Tianquan Lian, Emory Univ. (United States)

Published in SPIE Proceedings Vol. 8098:
Physical Chemistry of Interfaces and Nanomaterials X
Carlos Silva, Editor(s)

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