Constructing a Strongly Absorbing Low‐Bandgap Polymer Acceptor for High‐Performance All‐Polymer Solar Cells. Issue 43 (19th September 2017)

• Record Type: Journal Article
• Authors: Zhang, Zhi‐Guo; Yang, Yankang; Yao, Jia; Xue, Lingwei; Chen, Shanshan; Li, Xiaojun; Morrison, William; Yang, Changduk; Li, Yongfang
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 43(2017)
• Page Start: 13503
• Page End: 13507
• Publication Date: 2017-09-19
• Subjects: energy conversion -- organic electronics -- photoinduced force microscopy -- polymers -- solar cells; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201707678
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: All‐polymer solar cells (all‐PSCs) offer unique morphology stability for the application as flexible devices, but the lack of high‐performance polymer acceptors limits their power conversion efficiency (PCE) to a value lower than those of the PSCs based on fullerene derivative or organic small molecule acceptors. We herein demonstrate a strategy to synthesize a high‐performance polymer acceptorPZ1 by embedding an acceptor–donor–acceptor building block into the polymer main chain.PZ1 possesses broad absorption with a low band gap of 1.55 eV and high absorption coefficient (1.3×10 5 cm −1 ). The all‐PSCs with the wide‐band‐gap polymer PBDB‐T as donor andPZ1 as acceptor showed a record‐high PCE of 9.19 % for the all‐PSCs. The success of our polymerization strategy can provide a new way to develop efficient polymer acceptors for all‐PSCs. Abstract : Energy conversion : Embedding an acceptor–donor–acceptor‐structured organic semiconductor building block into a polymer main chain creates an excellent low‐band‐gap polymer acceptor with red‐shifted absorption and a high absorption coefficient. The polymer acceptor provides a record‐high power conversion efficiency of 9.19 % for all‐polymer solar cells.