Synthesis of novel sphericalπ-electron systems toward development of functional materials

富勒烯衍生物作为n型有机半导体在体异质结（BHJ）太阳能电池中占据主导地位。在这项工作中，我们开发了一种修改C60的σ-框架的方法，并成功地制备了三种不同LUMO水平的骨架转化富勒烯4、5和6。我们还评估了由C60衍生物和聚（3-己基噻吩）（P3HT）分别作为受体和供体材料组成的BHJ太阳能电池的性能。电化学测量结果表明，由于其中一个羰基的转变，6具有最高的LUMO水平。结果表明，6:P3HT电池的最高开路电压（Voc）为0。这比使用基准受体材料PCBM（Voc= 0.74 V）的电池高出20%。60 V)。

Fullerene derivatives have occupied a dominant position in bulk heterojunction(BHJ) solar cells as n-type organic semiconductors. In this work, we developed a method to modify theσ-frameworks of C60 and succeeded in the preparation of three types of skeletally-transformed fullerenes 4, 5, and 6 with distinct LUMO levels. We also evaluated the performance in the BHJ solar cells consisting of the C60 derivative and poly(3-hexylthiophene)(P3HT) as the acceptor and the donor materials, respectively. The electrochemical measurements showed that 6 has the highest LUMO level due to the transformation of one of the carbonyl groups. As a result, 6 : P3HT cell marked the highest open-circuit voltage(Voc) of 0. 74 V, which is 20% higher than that of the cell using the benchmark acceptor material PCBM(Voc=0. 60 V).