Long-Lived Delocalized Electron States in Quantum Dots: A Step-Scan Fourier Transform Infrared Study

Moonsub Shim, Sergej V. Shilov, Mark S. Braiman, Philippe Guyot-Sionnest

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

Visible light-induced IR absorption in colloidal CdSe quantum dots is observed by step-scan FTIR spectroscopy. Size dependence and the effect of surface modification are investigated. The introduction of surface hole trap states enhances and prolongs the IR absorption in photoexcited quantum dots. Our measurements reveal long-lived (>1 ms) delocalized electron states in 6 nm average diameter dots capped with thiocresol.

Original languageEnglish (US)
Pages (from-to)1494-1496
Number of pages3
JournalJournal of Physical Chemistry B
Volume104
Issue number7
StatePublished - Feb 24 2000

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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