Electron Transfer in Quantum-Dot-Sensitized ZnO Nanowires: Ultrafast Time-Resolved Absorption and Terahertz Study

详细信息    查看全文

• 作者：Karel 沤铆dek ; Kaibo Zheng ; Carlito S. Ponseca ; Jr. ; Maria E. Messing ; L. Reine Wallenberg ; Pavel Ch谩bera ; Mohamed Abdellah ; Villy Sundstr枚m ; T玫nu Pullerits
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：July 25, 2012
• 年：2012
• 卷：134
• 期：29
• 页码：12110-12117
• 全文大小：458K
• 年卷期：v.134,no.29(July 25, 2012)
• ISSN：1520-5126

文摘

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 (蟿 = 3鈥?2 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.