Pyran-bridged A-D-A type small molecular acceptors for organic solar cells. (1st May 2019)

• Record Type: Journal Article
• Authors: Liu, Zhitian; Zhang, Xiaolu; Ren, Peng; Wu, Yao; Zeng, Di; Duan, Xianbao; Gao, Xiang; Cai, Ping
• Is Part Of: Solar energy. Volume 183(2019)
• Page Start: 463
• Page End: 468
• Publication Date: 2019-05-01
• Subjects: Solar cells -- Non-fullerene acceptor -- Pyran-bridge; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2019.03.046
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: Pyran-bridged fused-ring is a promising unit to construct nonfullerene acceptors. The effects of π-bridge and terminal groups were systematically studied. Pyran-bridged nonfullerene acceptors exhibit wider absorption spectra. Abstract: Pyran is fused into the planar donor moiety to enhance the extinction coefficient and reduce the bandgap, thus two acceptors PTTIC and PTBT-R are designed and synthesized. Compared to the IDT-based acceptor, these pyran-bridged acceptors show higher the highest occupied molecular orbital level and wider absorption coverage. Devices fabricated with poly[(2, 6-(4, 8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1, 2-b:4, 5-b′]dithiophene)-co-(1, 3-di(5-thiophene-2-yl)-5, 7-bis(2-ethylhexyl)-benzo[1, 2-c:4, 5-c′]dithiophene-4, 8-dione)] (PBDB-T):PTTIC as the active layer give a power conversion efficiency (PCE) of 7.35%.