Journal
POLYMER CHEMISTRY
Volume 6, Issue 23, Pages 4290-4298Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5py00305a
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Funding
- Major Program for cultivation of the National Natural Science Foundation of China [91233112]
- National Natural Science Foundation of China [51273168, 21172187, 21202139]
- Ministry of Science and Technology of China [2010DFA52310]
- Innovation Group and Xiangtan Joint Project of Hunan Natural Science Foundation [12JJ7002, 12JJ8001]
- Hunan Provincial Education Department [13A102, 12B123]
- Postgraduate Science Foundation for Innovation in Hunan Province [CX2012B249, CX2013B268]
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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.
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