Electron Transfer in Quantum-Dot-Sensitized ZnO Nanowires: Ultrafast Time-Resolved Absorption and Terahertz Study
Journal of the American Chemical Society2012Vol. 134(29), pp. 12110–12117
Citations Over TimeTop 10% of 2012 papers
Karel Žídek, Kaibo Zheng, Carlito S. Ponseca, Maria E. Messing, Reine Wallenberg, Pavel Chábera, Mohamed Abdellah, Villy Sundström, Tõnu Pullerits
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.
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