Electron transfer in quantum-dot-sensitized ZnO nanowires: Ultrafast time-resolved absorption and terahertz study

Karel Žídek, Kaibo Zheng, Carlito S. Ponseca, Maria E. Messing, L. Reine Wallenberg, Pavel Chábera, Mohamed Abdellah, Villy Sundström, Tõnu Pullerits

Research output: Contribution to journalArticlepeer-review

112 Citations (Scopus)

Abstract

Photoinduced electron injection dynamics from CdSe quantum dots to ZnO nanowires is studied by transient absorption and time-resolved terahertz spectroscopy measurements. Ultrafast electron transfer from the CdSe quantum dots to ZnO is proven to be efficient already on a picoseconds time scale (τ = 3-12 ps). The measured kinetics was found to have a two-component character, whose origin is discussed in detail. The obtained results suggest that electrons are injected into ZnO via an intermediate charge transfer state.

Original languageEnglish
Pages (from-to)12110-12117
Number of pages8
JournalJournal of the American Chemical Society
Volume134
Issue number29
DOIs
Publication statusPublished - Jul 25 2012
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry

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