Effects of lattice strain and band offset on electron transfer rates in type-II nanorod heterostructures

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https://doi.org/10.1021/jz300275f
 http://hdl.handle.net/11603/29212

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UMBC Physics Department

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https://orcid.org/0000-0002-6370-8765

Date

2012-04-12

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journal articles
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McDaniel, Hunter, Matthew Pelton, Nuri Oh, and Moonsub Shim. “Effects of Lattice Strain and Band Offset on Electron Transfer Rates in Type-II Nanorod Heterostructures.” The Journal of Physical Chemistry Letters 3, no. 9 (May 3, 2012): 1094–98. https://doi.org/10.1021/jz300275f.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

Type-II nanorod heterostructures (NRHs) exhibit efficient directional charge separation and provide the potential to control this flow of charges through changes in structure and composition. We use transient-absorption spectroscopy to investigate how the magnitude of band offset and lattice strain alters dynamics of photogenerated electrons in CdSe/CdTe type-II NRHs. In the absence of alloying and strain effects, electron transfer occurs in ∼300 fs. Reducing the conduction band offset by means of alloying leads to an even shorter charge-separation time (<200 fs), whereas curved NRHs with pronounced strain exhibit a longer charge-separation time of ∼700 fs.