Construction of highly crystallized organic/inorganic nanostructures and development as transparent conducting films for photovoltaics

对用于无ITO高效光伏电池的新型透明导电薄膜进行了材料设计和优化。研究了锂掺杂氧化锌（ZnO）纳米棒阵列无机透明导电膜的制备、小分子有机染料在ZnO表面的单分子固定以及与导电聚合物聚3-己基噻吩（P3 HT）复合的杂化有机光致发光材料的组装与评价。证实Li掺杂导致1.通过提高电流密度和开路电压，功率转换效率（PCE）提高5倍。同时发现，引入高取向的单分子层可使开路电压增加一倍，引入近红外区分子吸收系数大的染料可使电流密度增加4倍。不仅ZnO，而且还设计了由卟啉/富勒烯和P3 HT或氧化钛组成的一维纳米组装体，并且与分散状态相比，成功地形成了高效的载流子通过。

Materials design and optimization of novel transparent conducting film for construction of ITO-free and highly efficient photovoltaic cells have been performed. Preparation of inorganic transparent conducting film made of Li-doped zinc oxide(ZnO) nanorod arrays, single molecular fixation of low-molecular organic dyes on the surface of the ZnO, and assembly and evaluation of hybrid organic photovoltaics in the combination with conducting polymer of poly(3-hexylthiophene)(P3HT) have been investigated. It was confirmed that the Li-doping resulted 1. 5 times improvement of power conversion efficiency(PCE) through the enhancement of the current density and the open circuit voltage. It was also found that introduction of the highly oriented single molecular layer brought doubled open circuit voltage and introduction of the dye with large molecular absorption coefficient in the near infrared region caused 4 times increment of the current density. Not only ZnO, but one-dimensional nanoassemblies composed of porphyrin/fullerene and P3HT or titanium oxide have also been designed and succeeded to form highly efficient carrier pass as compared with that of the dispersed state.