期刊
POLYMER
卷 53, 期 22, 页码 5103-5108出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.09.013
关键词
Polymer solar cells; DTP-based polymers; Conjugated polymers
资金
- 973 Project [2009CB623601, 2009CB930603]
- Science Fund for Creative Research Groups [20921061]
- National Natural Science Foundation of China [51173179, 20904055, 21074130]
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.
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