Tuning electron transfer rates via systematic shifts in the acceptor state density using size-selected ZnO colloids

Adam S. Huss, Andrew Bierbaum, Raghu Chitta, Darren J. Ceckanowicz, Kent R. Mann, Wayne L. Gladfelter, David A. Blank

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

We report direct measurements of the influence of the available density of acceptor states on the rate of near-barrierless electron transfer between a dye sensitizer and an oxide semiconductor. The electron donor was the excited state of a zinc porphyrin, and the acceptors were a series of size-selected ZnO nanocrystals. The available density of states was tuned by controlling the relative position of the ZnO band edge using quantum confinement. The resulting change in the rate was consistent with a simple model of the state density as a function of energy above the ZnO band edge.

Original languageEnglish (US)
Pages (from-to)13963-13965
Number of pages3
JournalJournal of the American Chemical Society
Volume132
Issue number40
DOIs
StatePublished - Oct 13 2010

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