The charge transfer process in Ru-bipyridyl complexes sensitized nanocrystalline TiO2 films

用飞秒时间分辨的泵浦一探测方法对两种联吡啶-钌化合物[3，3'－（LL）]_2Ru(NCS)_2和[4，4'－（LL）]_2Ru（NCS）_2敏化体系的光吸收、电子注入（injection）及电子-空穴复合（recombination）动力学过程作了研究．提出了一个简单有效的计算模型，通过计算拟合得出两种敏化体系的电子注入均在50fs内完成。最后还对光电流谱作了研究，对影响光电转换效率（incidentphoton-to-currentef-ficiency(IPCE))的各种因素作了讨论.结果对太阳光的电能转换和太阳能电池的制作有一定的意义。So far in the sensitization research of semiconducter nanoparticles, the outstanding sensitizing system is nanocrystalline TiO2 films sensitized bs Ru-bipyridle complxes. In this paper, we have investigated the electron injection and electron-hole recombination dynamics of two systems sensitized by [3, 3'-(LL)](2)Ru(NCS)(2) and [4,4'-(LL)](2)Ru(NCS)(2). A simple and effective model For calculation has also been presented. Through calculation and fit.ting, it is shown that the electron injection is completed within 50 fs for both systems. We have also performed photocurrent spectra measurement. The result indicates that the charge injection efficiency; is a major limit factor to incident-photon-to-current efficiency(IPCE). The research is meaningful for sunlight-electricity conversion and solar cells fabrication.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000074858800008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701SCI(E)中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)006520-5261