Electron Transfer from Single Semiconductor Nanocrystals to Individual Acceptor Molecules

Haixu Leng, James Loy, Victor Amin, Emily A Weiss, Matthew Pelton

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This Letter reports the measurement of photoinduced electron-transfer rates from individual CdSe/CdS nanocrystals, or quantum dots (QDs), to methyl viologen acceptor molecules adsorbed on the QD surfaces, using time-resolved photoluminescence at the single-nanocrystal level. For each QD measured, the electron-transfer rate is constant over time, and the photoluminescence blinking dynamics are independent of the measured transfer rate. The total electron-transfer rate is distributed in discrete, constant increments, corresponding to discrete numbers of adsorbed molecules on each QD. The results thus validate previous assumptions that viologen molecules adsorb independently on QD surfaces and that the total electron-transfer rate from a single QD to multiple molecules on its surface is simply the sum of the transfer rates to the individual molecules. The measurement provides an optical method to count the number of active acceptor molecules bound to a single nanocrystal and opens up new possibilities for mechanistic studies of charge transfer at the nanoscale.

Original languageEnglish
Pages (from-to)9-15
Number of pages7
JournalACS Energy Letters
Volume1
Issue number1
DOIs
Publication statusPublished - Jul 8 2016

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ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment
  • Materials Chemistry

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