A Conjugated Random Copolymer of Benzodithiophene-Difluorobenzene-Diketopyrrolopyrrole with Full Visible-Light Absorption for Bulk-Heterojunction Solar Cells

作者：Wang, Zhihui; Li, Zhanfeng^*; Zhang, Haiqing; Liu, Weipeng; Xu, Xiaoxiang; Si, Changfeng; Cui, Yanxia; Sun, Qinjun; Wang, Hua; Shi, Fang; Hao, Yuying

来源：Macromolecular Chemistry and Physics, 2014, 215(21): 2119-2124.

DOI：10.1002/macp.201400334

• bulk-heterojunction polymer solar cells
• full visible-light absorption
• power conversion efficiency
• random copolymers

Stille coupling polymerization is used to synthesize a new donor-acceptor (D-A) conjugated random copolymer (PBDT-DFB-DPP) that comprises an electron-rich benzodithiophene (BDT) unit in conjugation with electron-deficient 2,5-difluorobenzene (DFB) and diketopyrrolopyrrole (DPP) moieties, which have complementary light-absorption behavior. The thermal, photophysical, and electrochemical properties of the polymer are investigated using thermogravimetric analysis, UV-vis absorption spectroscopy, and cyclic voltammetry. The random copolymer exhibits both broad light absorption and a low-lying highest occupied molecular orbital (HOMO) level, which contribute to enhancement of the short-circuit current density (J(sc)) and open-circuit voltage (V-oc). A bulk-heterojunction polymer solar cell fabricated from PBDT-DFB-DPP and PC60BM exhibits a promising power conversion efficiency (PCE) of 2.50%.

• 出版日期2014-11
• 单位太原理工大学