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Improved photovoltaic performance of a 2D-conjugated benzodithiophene-based polymer by the side chain engineering of quinoxaline

By Qunping Fan, Manjun Xiao, Yu Liu, Wenyan Su, Huishan Gao, Hua Tan, Yafei Wang, Gangtie Lei, Renqiang Yang and Weiguo Zhu

Abstract

To investigate the influence of side chains of quinoxaline on the photovoltaic performances, a novel D-A-type polymer of PBDTDT(Qx-3)-T was synthesized and characterized, in which 5,8-dioctylthienyl substituted benzo[1,2-b: 4,5-b']dithiophene (BDT-T), thiophene (T) and 6,7-dioctyloxy-2,3-diphenylquinoxaline (Qx-3) were used as the donor (D) unit, pi-bridge and acceptor (A) unit, respectively. The resulting polymer exhibited good thermal stability with a high decomposition temperature of 357 degrees C, a low optical bandgap of 1.78 eV with an absorption onset of 696 nm, a low-lying highest occupied molecular orbital (HOMO) energy level of -5.51 eV, and a high carrier mobility of 2.19 x 10(-4) cm(2) V-1 s(-1). Compared to the reported analogues, polymer solar cells (PSCs) based on PBDTDT(Qx-3)-T/PC71BM demonstrated the highest open-circuit voltages (V-oc) up to 0.96 V. The maximum power conversion efficiency (PCE) of 6.9% with a V-oc of 0.94 V, short-circuit current (J(sc)) of 11.28 mA cm(-2) and a fill factor (FF) of 64.7% was obtained with a delicate balance among the above factors for the polymer in PSCs. On the basis of these results, it can be concluded that the appending two octyloxy side chains at 6,7-positions of quinoxaline in the BDT-T-alt-DTQx type polymers would be a feasible approach to improve photovoltaic properties

Topics: Science & Technology, Physical Sciences, Polymer Science, Polymer Science, OPEN-CIRCUIT VOLTAGE, ORGANIC SOLAR-CELLS, CONJUGATED POLYMERS, CHARGE-TRANSFER, COPOLYMERS, EFFICIENCY, QUINACRIDONE, ORIENTATION, SINGLE, BENZO
Year: 2015
DOI identifier: 10.1039/c5py00305a
OAI identifier: oai:ir.qibebt.ac.cn:337004/6475
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