Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-01-01

Journal: RSC ADVANCES

Included Journals: EI、SCIE

Volume: 7

Issue: 38

Page Number: 23779-23786

ISSN: 2046-2069

Abstract: A novel D-pi-A-pi-D-type organic small molecule (OSM) named (TPACN)(2)Q(x) 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 electrondonor (D) moieties, and acrylonitrile as the p-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)Q(x):PC61BM 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.