Electron transfer in quantum-dot-sensitized ZnO nanowires: ultrafast time-resolved absorption and terahertz study |
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Authors: | ?ídek Karel Zheng Kaibo Ponseca Carlito S Messing Maria E Wallenberg L Reine Chábera Pavel Abdellah Mohamed Sundström Villy Pullerits Tõnu |
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Institution: | Department of Chemical Physics, Lund University, Box 124, 22100 Lund, Sweden. |
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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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