Research Center for Applied Sciences, Academia Sinica, 128 Academia Road, Taipei 115-29, Taiwan.
ACS Nano. 2012 Jan 24;6(1):176-82. doi: 10.1021/nn2036957. Epub 2011 Dec 2.
We utilize single-molecule spectroscopy combined with time-correlated single-photon counting to probe the electron transfer (ET) rates from various types of semiconductor hetero-nanocrystals, having either type-I or type-II band alignment, to single-walled carbon nanotubes. A significantly larger ET rate was observed for type-II ZnSe/CdS dot-in-rod nanostructures as compared to type-I spherical CdSe/ZnS core/shell quantum dots and to CdSe/CdS dot-in-rod structures. Furthermore, such rapid ET dynamics can compete with both Auger and radiative recombination processes, with significance for effective photovoltaic operation.
我们利用单分子光谱学结合时间相关单光子计数来探测各种类型的半导体异质纳米晶体到单壁碳纳米管的电子转移（ET）速率，这些异质纳米晶体具有 I 型或 II 型能带排列。与 I 型球形 CdSe/ZnS 核/壳量子点和 CdSe/CdS 点-棒结构相比，II 型 ZnSe/CdS 点-棒纳米结构表现出显著更高的 ET 速率。此外，这种快速 ET 动力学可以与俄歇和辐射复合过程竞争，这对于有效的光伏操作具有重要意义。
