侧链长度对稠环电子受体光伏性能的影响  

Effect of side chain length on photovoltaic performance of fused-ring electron acceptors

作　　者：朱景帅 陆恒 贾博宇 李振[1] 占肖卫[2] Jingshuai Zhu;Heng Lu;Boyu Jia;Zhen Li;Xiaowei Zhan(Hubei Key Lab on Organic and Polymeric,Opto-Electronic Materials,Department of Chemistry,Wuhan University,Wuhan 430072,China;Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,School of Materials Science and Engineering,Peking University,Beijing 100871,China)

机构地区：[1]武汉大学化学与分子科学学院,有机高分子光电功能材料湖北省重点实验室,武汉430072 [2]北京大学材料科学与工程学院,高分子化学与物理教育部重点实验室,北京100871

出　　处：《中国科学：化学》2022年第2期362-368,共7页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(编号:51761165023,21734007)资助项目。

摘　　要：本文设计合成了一系列不同侧链长度的稠环电子受体ITIC衍生物,研究了侧链长度对光伏性能的影响.随着苯基侧链上烷基从C5不断增长到C10,ITIC系列的最高占据分子轨道(HOMO)能级逐渐下降,最低未占分子轨道(LUMO)能级逐渐升高.溶液中的吸收光谱几乎没有变化,而薄膜中的吸收光谱逐渐蓝移,光学带隙增大.电子迁移率逐渐变小.以聚合物J71为电子给体、ITIC系列为电子受体制备的有机太阳能电池器件的开路电压逐渐提高,短路电流密度逐渐减小,填充因子在65.4%~68.4%之间,光电转换效率在9.79%~10.2%之间,其中,含C6~C8侧链的受体展现出较高效率.A series of ITIC analogues with various alkyl groups on the phenyl side chains were synthesized, and the effects of the alkyl length on the photovoltaic performance of the ITIC series were studied. Increasing alkyl length from pentyl to decyl slightly down-shifts highest occupied molecular orbital energy level and up-shifts lowest unoccupied molecular orbital energy level. In the solution, the absorption spectra of these six molecules are almost the same, but those in the films are slightly blue-shift with increasing the alkyl length. Electron mobility of the ITIC series gradually decreases with increasing the alkyl length. Organic solar cells based on J71:ITIC series blends were fabricated. With increasing the alkyl length of the ITIC series, open-circuit voltage slightly increases, short-circuit current density gradually decreases, fill factors are 65.4%–68.4%, power conversion efficiencies are 9.79%–10.2%, and the ITIC derivatives with C6, C7 and C8 side chains yield higher values of 10.1%–10.2%.

关 键 词：有机太阳能电池 非富勒烯受体 稠环电子受体 侧链 

分 类 号：TB30[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]