Efficient small molecule photovoltaic donor based on 2, 3-diphenyl-substituted quinoxaline core for solution-processed organic solar cells. Issue 38 (3rd May 2017)

• Record Type: Journal Article
• Authors: Xie, Bao; Bi, Sheng; Wu, Rui; Yin, Lunxiang; Ji, Changyan; Cai, Zhengjiang; Li, Yanqin
• Is Part Of: RSC advances. Volume 7:Issue 38(2017)
• Page Start: 23779
• Page End: 23786
• Publication Date: 2017-05-03
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra01859b
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : An excellent PCE of 6.25% was achieved based on a novel OSM(TPACN)2 Qx containing 2, 3-diphenyl-substituted quinoxaline (Qx) as electrophilic core. Abstract : A novel D–π–A–π–D-type organic small molecule (OSM) named(TPACN)2 Qx was designed and synthesized for solution-processible organic solar cells (OSCs), which contained 2, 3-diphenyl-substituted quinoxaline (Qx) as the central acceptor (A) unit, triphenylamine (TPA) as terminal electron-donor (D) moieties, and acrylonitrile as the π-linkage segment. With an effective electron-withdrawing property and relatively stable quinoid geometry of Qx, (TPACN)2 Qx exhibits a narrow band-gap of 1.88 eV and strong and broad absorption at 300–700 nm. As a consequence, an excellent power conversion efficiency (PCE) of 6.25% was achieved based on the(TPACN)2 Qx :PC61 BM blend using a simple spin-coating process in a solution, which is the highest efficiency achieved to date for Qx-core based solution-processed OSM photovoltaic (PV) devices. The impressive result demonstrates that OSMs employing quinoxaline derivative as an electrophilic unit can compete with their polymer counterparts.