A Conjugated Random Copolymer of Benzodithiophene‐Difluorobenzene‐Diketopyrrolopyrrole with Full Visible‐Light Absorption for Bulk‐Heterojunction Solar Cells. Issue 21 (12th September 2014)

• Record Type: Journal Article
• Authors: Wang, Zhihui; Li, Zhanfeng; Zhang, Haiqing; Liu, Weipeng; Xu, Xiaoxiang; Si, Changfeng; Cui, Yanxia; Sun, Qinjun; Wang, Hua; Shi, Fang; Hao, Yuying
• Is Part Of: Macromolecular chemistry and physics. Volume 215:Issue 21(2014:Nov.)
• Page Start: 2119
• Page End: 2124
• Publication Date: 2014-09-12
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201400334
• Languages: English
• ISSNs: 1022-1352

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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 (<italic>J</italic>_sc) and open‐circuit voltage (<italic>V</italic>_oc). A bulk‐heterojunction polymer solar cell fabricated from PBDT‐DFB‐DPP and PC₆₀BM exhibits a promising power conversion efficiency (PCE) of 2.50%. <boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgh2ck92m58" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>