Ultrafast charge separation from highly reductive ZnTe/CdSe type II quantum dots

Shengye Jin, Jun Zhang, Richard D. Schaller, Tijana Rajh, Gary P. Wiederrecht

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29 Citations (Scopus)

Abstract

The low electron affinity of ZnTe quantum dots (QDs) makes it of interest for critically important photocatalytic processes. However, studies of charge transfer from such materials to adsorbates have not been reported. Here, the ultrafast internal and external charge separation dynamics in ZnTe/CdSe core/shell type II QDs have been studied through femtosecond transient absorption spectroscopy. The internal electron transfer time from a ZnTe core to a CdSe shell was found to be 0.67 ps, while the external electron transfer time from QDs to adsorbed molecules was found to be <0.2 ps. Such a fast external charge separation time is due to the extraordinarily high conduction band energy potential of this QD composition. This study indicates the preservation of high photodriven reductive abilities in the ZnTe/CdSe core/shell type II heterostructures.

Original languageEnglish
Pages (from-to)2052-2058
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume3
Issue number15
DOIs
Publication statusPublished - Aug 2 2012

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ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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