Asymmetrical Squaraines Bearing Fluorine-Substituted Indoline Moieties for High-Performance Solution-Processed Small-Molecule Organic Solar Cells
Asymmetrical Squaraines Bearing Fluorine-Substituted Indoline Moieties for High-Performance Solution-Processed Small-Molecule Organic Solar Cells
复制标题
带有氟取代二氢吲哚部分的不对称方酸菁用于高性能溶液加工小分子有机太阳能电池
DOI：
10.1021/acsami.5b03558
复制
发表时间：
2015
影响因子：
9.5
通讯作者：
Kido Junji
中科院分区：
文献类型：
--
作者：
Yang Daobin;Yang Lin;Huang Yan;Jiao Yan;Igarashi Tsukasa;Chen Yao;Lu Zhiyun;Pu Xuemei;Sasabe Hisahiro;Kido Junji
以吲哚基为基础，制备了两种新型不对称方阵ASQ-5-F和ASQ-5-DF，分别具有一个和两个氟取代基，用于研究氟取代对小分子体积异质结有机太阳能电池（OSCs）的影响。与非氟取代ASQ-5相比，氟取代ASQ-5- f和ASQ-5- df具有类似的吸收带隙，但分别降低了0.05和0.10 eV的最高已占据分子轨道（HOMO）能级。单晶分析表明，ASQ-5- df比ASQ-5表现出更理想的空穴载流子收集的分子间填充模式；因此，可以获得更高的空穴迁移率。因此，用ASQ-5- f /PC71BM和ASQ-5- df /PC71BM共混物制备的溶液处理小分子BHJ OSCs的功率转换效率（PCE分别为5.0%和6.0%）高于ASQ-5/PC71BM（4.5%）。与基于asq -5的器件相比，PCE的显著改善可归因于voc、Jsc和FF的同时增强。据我们所知，这是基于角鲨碱溶液处理的BHJ OSCs中最高的PCE(6.0%)，也是基于小分子氟化供体片段的OSCs中最高的PCE。
Two novel asymmetrical squaraines based on the indoline unit, ASQ-5-F and ASQ-5-DF, with one and two fluorine substituents, have been developed to investigate the effect of fluorine substituted on small-molecule bulk-heterojunction (BHJ) organic solar cells (OSCs). In comparison with non-fluorine-substituted ASQ-5, both fluorine-substituted ASQ-5-F and ASQ-5-DF possess analogous absorption band gaps but 0.05 and 0.10 eV lowered highest occupied molecular orbital (HOMO) energy levels, respectively. Single-crystal analysis exhibits that ASQ-5-DF shows more desirable intermolecular packing patterns for the hole-carrier collection than ASQ-5 does; hence, higher hole mobility could be acquired. Therefore, solution-processed small-molecule BHJ OSCs fabricated with ASQ-5-F/PC71BM and ASQ-5-DF/PC71BM blends exhibit extremely higher power conversion efficiency (PCE; 5.0% and 6.0%, respectively) than that of ASQ-5/PC71BM (4.5%). The much improved PCE could be attributed to the simultaneously enhancedVoc,Jsc, and FF relative to those of the ASQ-5-based device. To our knowledge, this is the highest PCE (6.0%) among squaraine-based solution-processed BHJ OSCs and the highest PCE in OSCs based on the fluorinated donor segment of small molecules.