Asymmetrical Squaraines Bearing Fluorine-Substituted Indoline Moieties for High-Performance Solution-Processed Small-Molecule Organic Solar Cells

被引：39

作者：

Yang, Daobin ^{[1
,2
]}

Yang, Lin ^{[1
]}

Huang, Yan ^{[1
]}

Jiao, Yan ^{[1
]}

Igarashi, Tsukasa ^{[2
]}

Chen, Yao ^{[1
]}

Lu, Zhiyun ^{[1
]}

Pu, Xuemei ^{[1
]}

Sasabe, Hisahiro ^{[2
]}

Kido, Junji ^{[2
]}

机构：

[1] Sichuan Univ, Coll Chem, Key Lab Green Chem & Technol, Minist Educ, Chengdu 610064, Peoples R China

[2] Yamagata Univ, Res Ctr Organ Elect, Dept Organ Device Engn, Yonezawa, Yamagata 9928510, Japan

来源：

ACS APPLIED MATERIALS & INTERFACES | 2015年 / 7卷 / 24期

基金：

中国国家自然科学基金;

关键词：

asymmetrical squaraines; fluorine-substituted; packing pattern; solution-processed; small-molecule organic solar cells; OPEN-CIRCUIT VOLTAGE; SOLID-STATE STRUCTURE; PHOTOVOLTAIC CELLS; CARRIER MOBILITY; SIDE-CHAIN; EFFICIENCY; DYES; UNIT; DIKETOPYRROLOPYRROLE; SEMICONDUCTORS;

D O I：

10.1021/acsami.5b03558

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 enhanced V-oc, J(sc), 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.

引用

页码：13675 / 13684

页数：10

共 45 条

[1] Fluorinated Copolymer PCPDTBT with Enhanced Open-Circuit Voltage and Reduced Recombination for Highly Efficient Polymer Solar Cells [J].