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Annual Review of Physical Chemistry

Volume 67, 2016

Charge Transfer Dynamics from Photoexcited Semiconductor Quantum Dots

Abstract

Understanding photoinduced charge transfer from nanomaterials is essential to the many applications of these materials. This review summarizes recent progress in understanding charge transfer from quantum dots (QDs), an ideal model system for investigating fundamental charge transfer properties of low-dimensional quantum-confined nanomaterials. We first discuss charge transfer from QDs to weakly coupled acceptors within the framework of Marcus nonadiabatic electron transfer (ET) theory, focusing on the dependence of ET rates on reorganization energy, electronic coupling, and driving force. Because of the strong electron–hole interaction, we show that ET from QDs should be described by the Auger-assisted ET model, which is significantly different from ET between molecules or from bulk semiconductor electrodes. For strongly quantum-confined QDs on semiconductor surfaces, the coupling can fall within the strong coupling limit, in which case the donor–acceptor interaction and ET properties can be described by the Newns–Anderson model of chemisorption. We also briefly discuss recent progress in controlling charge transfer properties in quantum-confined nanoheterostructures through wavefunction engineering and multiple exciton dissociation. Finally, we identify a few key areas for further research.

Keyword(s): Auger-assisted electron transfer, electron transfer, Marcus theory, Newns–Anderson model, quantum dot, time-resolved spectroscopy
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/content/journals/10.1146/annurev-physchem-040215-112128
2016-05-27
2024-04-20
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Charge Transfer Dynamics from Photoexcited Semiconductor Quantum Dots
Annual Review of Physical Chemistry 67, 259 (2016); https://doi.org/10.1146/annurev-physchem-040215-112128
/content/journals/10.1146/annurev-physchem-040215-112128
/content/journals/10.1146/annurev-physchem-040215-112128
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