D-A copolymers based on 5,6-difluorobenzotriazole and oligothiophenes: Synthesis, field effect transistors, and polymer solar cells

被引：27

作者：

Liu, Xuncheng ^{[1
]}

Cai, Ping ^{[1
]}

Chen, Zhenhui ^{[1
]}

Zhang, Lianjie ^{[1
]}

Zhang, Xiaofei ^{[1
]}

Sun, Jiangman ^{[1
]}

Wang, Haitao ^{[1
]}

Chen, Junwu ^{[1
,2
]}

Peng, Junbiao ^{[1
]}

Chen, Hongzheng ^{[2
]}

Cao, Yong ^{[1
]}

机构：

[1] S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China

[2] Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China

来源：

POLYMER | 2014年 / 55卷 / 07期

基金：

中国国家自然科学基金; 国家教育部博士点专项基金资助;

关键词：

Conjugated polymers; 5,6-Difluorobenzotriazole; Oligothiophene; THIN-FILM TRANSISTORS; PHOTOVOLTAIC PROPERTIES; HIGH-EFFICIENCY; CONJUGATED POLYMERS; DONOR; BENZOTHIADIAZOLE; BENZOTRIAZOLE; PERFORMANCE; CATHODE; ORDER;

D O I：

10.1016/j.polymer.2014.02.046

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Two new 5,6-difluorobenzotriazole (FBTA)-oligothiophene copolymers PFBTA-3T and PFBTA-4T, comprising terthiophene (3T) and quaterthiophene (4T) on the backbone, respectively, were successfully synthesized. A new route to synthesize FBTA monomer was established. Polymers PFBTA-3T and PFBTA-4T exhibited good solubility in common organic solvents and good thermal stability. In comparison to poly (3-hexylthiophene), the incorporations of the FBTA as in PFBTA-3T and PFBTA-4T could result in smaller band gaps around 1.83 eV for the two copolymers. The HOMO levels of PFBTA-3T and PFBTA-4T were -5.49 and -5.31 eV, respectively, while their LUMO levels were -3.65 and -3.90 eV, respectively. In field-effect transistors fabricated without high temperature thermal annealing, PFBTA-3T and PFBTA-4T could display hole mobilities of 1.68 x 10(-3) and 1.31 x 10(-2) cm(2) V-1 s(-1), respectively. The mobility for PFBTA-4T is the highest among the reported FBTA-based polymers, suggesting that FBTA is a promising heterocycle to construct polymers with high mobility. Polymer solar cells were also fabricated with PFBTA-3T and PFBTA-4T as the donor and PC61BM as the acceptor. With copolymer: PC61BM = 1:1.5 as the active layers, polymer solar cells showed power conversion efficiencies of 3.0% and 2.51% for PFBTA-3T and PFBTA-4T, respectively. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：1707 / 1715

页数：9

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