光敏染料是染料敏化太阳能电池(DSCs)中极为重要的结构部件，其吸光效率低是导致DSCs光电效率不高的主要因素之一。拓宽并增强染料在可见乃至近红外区对光的响应是提高DSCs 光电效率的有效手段。本项目在前期研究基础上，以饱和烷基链为连接基将三个性能优异吸光互补的Donor-π-Acceptor 单元引入到一个分子中，制备含有三个独立捕光单元的新型有机光敏染料。通过改变连接基长度或单独修饰D-π-A单元中的电子给体或π桥，调控染料的光物理、电化学性质，使染料在可见乃至近红外区具有高光电响应能力，并实现染料能级水平与TiO2导带及电解质中氧化还原电对能级较好地匹配；研究染料结构变化对DSCs 开路电压、短路电流密度、光电效率等光电性能参数的影响，探寻并构建染料结构与DSCs 高光电效率之间存在的一般规律，为制备稳定、高效的DSCs 光伏器件提供新材料和新思路。

Organic sensitizers is well known as a crucial component of dye-sensitized solar cells(DSCs). Low light-absorption efficiency of the organic sensitizers is one of the key factors which lead to low overall conversion efficiency of the DSCs. Broadening and enhancing the absorption of the dyes in the whole visible and near IR regions is an effective way to improve the overall conversion efficiency of the DSCs. Here, three excellent Donor (D) -π bridge (π) -Acceptor (A) units (i.e., light-harvesting units) of absorption range of complementary will be introduced into one dye molecule by the saturated alkyl chain, and series of novel organic sensitizers featuring three light-harvesting units will be synthesized. The photophysical, electrochemical properties of the dyes can be regulated through tailoring the alkyl chain, or the donors and the π-bridges of D-π-A units, respectively, which will result in high response to the sunlight in the range of whole visible and near IR, and will make a good match of the energy leverls of the dyes with the conduction band of TiO2 and with the redox potential of the electrolyte. Moreover, on evaluating the photovoltaic performances (e.g. open circuit voltage, short circuit current, fill factor, and overall conversion efficiency) of DSCs influenced by the structure of the dyes, a general rule between the structure of the sensitizers and the high overall conversion efficiency of DSCs would be built, and it is hope to provide new materials and new ideas for fabricating of photovoltaic devices featuring stablity and high conversion efficiency.