Effect of Thieno[3,2-b]thiophene π-bridge on photovoltaic performance of a D-A copolymer of alkoxy-benzodithiophene-alt-fluoro-benzotriazole

被引：12
作者：
Yan, Tinghai [1 ,2 ]
Bin, Haijun [1 ,2 ]
Sun, Chenkai [1 ,2 ]
Zhang, Zhi-Guo [1 ]
Li, Yongfang [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Inst Chem, CAS Res Educ Ctr Excellence Mol Sci, CAS Key Lab Organ Solids, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China
[3] Soochow Univ, Coll Chem Chem Engn & Mat Sci, Lab Adv Optoelect Mat, Suzhou 215123, Jiangsu, Peoples R China
来源：
ORGANIC ELECTRONICS | 2018年 / 55卷
关键词：
Polymer solar cells; Benzodithiophene (BDT)-alt-fluorobenzotriazole (FBTA) D-A copolymer thieno[3,2-b]thiophene pi-bridge; Conjugated polymer donor materials; POLYMER SOLAR-CELLS; ELECTRON-ACCEPTORS; MOLECULAR DESIGN; EFFICIENCY; DONOR; RECOMBINATION;
D O I：
10.1016/j.orgel.2018.01.018
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A new J-series D-A copolymer J41 based on alkoxy-benzodithiophene (BDT)-alt-fluorobenzotriazole (FBTA) was synthesized with thieno[3,2-b]thiophene (TT) as pi-bridges. In comparison with its corresponding D-A copolymer J40 with thiophene pi-bridges, J41 shows a deeper HOMO energy level of -5.39 eV and slightly blue-shifted absorption. The polymer solar cells (PSCs) with J41 as donor and a low bandgap n-type organic semiconductor (n-OS) ITIC as acceptor exhibited a maximum power conversion efficiency (PCE) of 8.74% with a higher V-oc of 0.93 V, which is significantly improved in comparison with the PCE of 6.48% with V-oc of 0.89 V for the corresponding PSCs with J40 as donor. The results indicate that the pi-bridge engineering could further improve photovoltaic performance of the BDT-alt-FBTA-based D-A copolymers.
引用
收藏
页码：106 / 111
页数：6
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