Title of Paper:Efficient small molecule photovoltaic donor based on 2,3-diphenyl-substituted quinoxaline core for solution-processed organic solar cells

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Date of Publication:2017-01-01

Journal:RSC ADVANCES

Included Journals:SCIE、EI

Volume:7

Issue:38

Page Number:23779-23786

ISSN No.: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.