Charge Dynamics following Dye Photoinjection into a TiO2 Nanocrystalline Network
Charge Dynamics following Dye Photoinjection into a TiO2 Nanocrystalline Network
复制标题
染料光注入 TiO2 纳米晶网络后的电荷动力学
DOI：
10.1021/jp973204j
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发表时间：
1998
影响因子：
3.3
通讯作者：
R. Schropp
中科院分区：
文献类型：
--
作者：
J. Salafsky;W. Lubberhuizen;E. Faassen;R. Schropp
在众所周知的光敏过程中，电子可以通过表面吸附的钌基染料注入二氧化钛纳米晶体中。在这里，我们提出了时间分辨微波电导率测量，测量电荷注入后，在染料阳离子的电子供体存在的情况下，电子从此类 TiO2 纳米晶体的电互连网络中衰变，以防止直接复合。该衰减过程的时间尺度为数百毫秒到几秒，这解释了基于这些材料的设备的高电流收集效率，因为较长的时间尺度允许通过网络缓慢的电荷传输。
Electrons can be injected into TiO2 nanocrystals by a surface-adsorbed Ru-based dye in a well-known photosensitization process. Here we present time-resolved microwave conductivity measurements of the decay of electrons out of an electrically interconnected network of such TiO2 nanocrystals, following charge injection, and in the presence of an electron donor to the dye cation that prevents direct recombination. The time scale for this decay process is hundreds of milliseconds to seconds and explains the high current collection efficiency in devices based on these materials, since the long time scale allows for slow charge transport through the network.