Synthesis and photovoltaic properties of a donor-acceptor polymer containing both dithieno[3,2-b:2′,3′-d]pyrrole and fluorene as donor units

被引:9
作者
Song, Haiyang [1 ,2 ]
Tong, Hui [1 ]
Xie, Zhiyuan [1 ]
Wang, Lixiang [1 ]
Wang, Fosong [1 ]
机构
[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
基金
中国国家自然科学基金;
关键词
Polymer solar cells; DTP-based polymers; Conjugated polymers; HETEROJUNCTION SOLAR-CELLS; CONJUGATED POLYMERS; EFFICIENT; POLYFLUORENE; PERFORMANCE; COPOLYMERS; DESIGN;
D O I
10.1016/j.polymer.2012.09.013
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A new donor-acceptor polymer (PDTPDBF), containing both dithieno[3,2-b:2',3'-d]pyrrole (DTP) and fluorene as electron-donating units and benzo-2,1,3-thiadiazole (BT) as electron-accepting unit, was synthesized by Suzuki coupling reaction. Its optical, thermal, electrochemical and photovoltaic properties have been investigated. Compared with typical DTP-based donor-acceptor polymers, PDTPDBF showed a distinct low HOMO level (-5.47 eV). Theoretical calculation attributed this low-lying HOMO level to both the weaker electron-donating ability of the fluorene unit and the moderately twisted conformation between the fluorene unit and the BT unit. Polymer solar cells (PSCs) based on PDTPDBF and PC71BM (1:2, w/w) exhibited an open circuit voltage of 0.84 V and a power conversion efficiency (PCE) of 4.2%, both of which are relatively high values for DTP-based photovoltaic polymers. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:5103 / 5108
页数:6
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