Electron-deficient diketone unit engineering for non-fused ring acceptors enabling over 13% efficiency in organic solar cells
作者:Dou Luo、Lanqing Li、Yongqiang Shi、Jianqi Zhang、Kai Wang、Xugang Guo、Aung Ko Ko Kyaw
DOI:10.1039/d1ta03643b
日期:——
units, are synthesized. TPDC-4F with a thieno[3,4-c]pyrrole-4,6-dione core exhibits a smaller optical bandgap of 1.42 eV, downshifted lowest unoccupied molecular orbital energy levels, higher electron mobility, and enhanced molecular packing order in neat thin films as compared to BTIC-4F with a 2,2′-bithiophene-3,3′-dicarboxyimide core. As a result, the OSC based on TPDC-4F with stronger molecular packing
与通常研究的具有大稠合骨架结构和繁琐合成步骤的非富勒烯电子受体不同,非稠环电子受体由于其合成简单和器件性能可比而对有机太阳能电池 (OSC) 具有吸引力。然而,选择合适的构建模块来构建非稠环电子受体以实现高性能 OSC 是关键。在本文中,两个简单的非稠合环的电子受体,TPDC-4F和BTIC-4F,其具有相同的端子和4 ħ环戊二烯并[1,2- b:5,4- b二噻吩单元加上不同电子- ']合成了缺乏的二酮中心单元。TPDC-4F与噻吩[3,4-c ]pyrrole-4,6-dione 核与BTIC-4F相比,具有 1.42 eV 的较小光学带隙,降低了最低未占分子轨道能级,提高了电子迁移率,并增强了纯薄膜中的分子堆积顺序, 2'-bithiophene-3,3'-dicarboxyimide 核心。结果,基于具有更强分子堆积的TPDC-4F的 OSC产生了 13.35% 的高功率转换效率 (PCE),V