A naphthalimide end capped imide-fused benzothiadiazole based small molecule acceptor for organic solar cells. (6th February 2019)

• Record Type: Journal Article
• Authors: Lan, Liuyuan; Zhao, Baofeng; Zhang, Jie; Li, Yunchuan; Liu, Yang; Mai, Yuliang; Liao, Bing; Gao, Chao
• Is Part Of: New journal of chemistry. Volume 43:Number 8(2019)
• Page Start: 3565
• Page End: 3571
• Publication Date: 2019-02-06
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj04896g
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : A novel small molecule acceptor of a naphthalimide terminated imide-fused benzothiadiazole derivative was developed for P3HT-based organic solar cells with a relatively high open-circuit voltage of 0.78 V. Abstract : In this study, by incorporating imide-fused benzothiadiazole (BIBT) as the electron-withdrawing core unit, for the first time we designed and synthesized a novel A1–D–A2–D–A1 type small molecule acceptor denotedBIBT-NI for organic solar cell (OSC) applications. Its thermal, optical and electrochemical properties were thoroughly investigated. Density functional theory was also applied to shed light on the molecular configuration and energy level distribution of the acceptor. This molecule exhibited a strong absorption spectrum in the range of 420–550 nm together with an optical bandgap of 2.04 eV. The inverted OSC devices based onBIBT-NI as an electron-acceptor combined with the classical polymer poly(3-hexylthiophene) (P3HT) as an electron-donor afforded an optimal power conversion efficiency of 2.11% with a comparatively high open-circuit voltage of 0.78 V. These results underscore the promising potential of BIBT as an electron-deficient building block in constructing nonfullerene acceptors for OSCs.