钙钛矿太阳能电池是以基于钙钛矿结构的半导体化合物（如有机-金属卤化物CH3NH3PbX3 (X=I, Br, Cl)）作为光吸收层以及光电转换和光生载流子传输材料的新型薄膜太阳能电池，以C60-PCBM为代表的富勒烯衍生物由于具有很强的接受电子的能力以及高电子迁移率而被常用于反向结构钙钛矿太阳能电池的电子传输材料。本项目以富勒烯材料的能级工程研究为出发点，提出开发一系列具有不同分子能级、用于反向结构钙钛矿太阳能电池的新型电子传输材料的富勒烯衍生物。首先设计和合成几类新型可溶性富勒烯衍生物，然后选择具有合适的分子能级且电子迁移率较高的富勒烯衍生物，将其作为电子传输材料引入到反向结构钙钛矿太阳能电池中，筛选出比目前常用的C60-PCBM电子传输性能更好的富勒烯衍生物电子传输材料，为提高反向结构钙钛矿太阳能电池的效率和稳定性提供一个切实可行的方案，并为拓展富勒烯材料的实际应用作出有意义的探索。

Perovskite solar cell (PSC) is a novel type of thin film solar cell, which is based on perovskite-structure semiconducting compounds such as organic-metal halide CH3NH3PbX3 (X=I, Br, Cl) acting as not only light-absorbing layer but also photoelectric conversion and photoinduced charge carrier transporting material. Fullerene derivatives such as C60-PCBM have been usually applied as electron-transporting materials in inverted-structure PSC due to their strong electron-accepting ability and high electron mobility. In this project, focusing on energy level engineering study of fullerene materials, we propose to develop a series of novel fullerene derivatives applicable as electron-transporting materials of inverted-structure PSC, which have tunable molecular energy levels. First we will design and synthesize several types of novel soluble fullerene derivatives, and then we will select those derivatives with suitable molecular energy levels and high electron mobilities, and apply them as electron-transporting materials in inverted-structure PSC devices. Finally we will determine the best fullerene derivative electron-transporting materials which have better electron-transporting property than the commonly used C60-PCBM. Our project will not only provide a practical strategy toward improving the performance and stablity of inverted-structure PSC, but also contribute to the practical applications of fullerenes.