A double B←N bridged bipyridine (BNBP)-based polymer electron acceptor: all-polymer solar cells with a high donor : acceptor blend ratio. (21st November 2016)

• Record Type: Journal Article
• Authors: Long, Xiaojing; Ding, Zicheng; Dou, Chuandong; Liu, Jun; Wang, Lixiang
• Is Part Of: Materials chemistry frontiers. Volume 1:Number 5(2017)
• Page Start: 852
• Page End: 858
• Publication Date: 2016-11-21
• Subjects: Materials science -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1039/c6qm00245e
• Languages: English
• ISSNs: 2052-1529

Abstract

Abstract : All-polymer solar cells with P3HT as an electron donor exhibit good device performance with high donor : acceptor blend ratios (w : w, from 0.5 : 1 to 9 : 1). Abstract : A new polymer electron acceptor (P-BNBP-CDT ) composed of an alternating double B←N bridged bipyridine (BNBP) unit and a cyclopenta-[2, 1- b :3, 4- b ′]-dithiophene (CDT) unit has been developed.P-BNBP-CDT exhibits strong light absorption in the visible range of 500–650 nm and suitable LUMO/HOMO energy levels ( E LUMO/HOMO ) of −3.45 eV/−5.64 eV, which are very complementary to that ( E LUMO/HOMO = −3.2 eV/−5.2 eV) of the widely-used polymer donor, poly(3-hexylthiophene) (P3HT). All-polymer solar cells (all-PSCs) with P3HT as an electron donor andP-BNBP-CDT as an electron acceptor exhibit power conversion efficiencies (PCEs) exceeding 1.0% with high donor : acceptor blend ratios (w : w, from 0.5 : 1 to 9 : 1). The highest PCE of these devices is 1.76% with a high donor : acceptor blend ratio of 5 : 1. These results not only indicate that BNBP-based polymers are promising for P3HT : polymer acceptor devices, but also suggest the potential for low cost and facile device processing of all-PSCs.