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Effects of Oxygen Atoms Introduced at Different Positions of Non-Fullerene Acceptors in the Performance of Organic Solar Cells with Poly(3-hexylthiophene)

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posted on 2019-12-27, 15:38 authored by Bo Xiao, Mengzhen Du, Xiaochen Wang, Zuo Xiao, Gongqiang Li, Ailing Tang, Liming Ding, Yanfang Geng, Xiangnan Sun, Erjun Zhou
With the development of large-area fabrication technologies for organic solar cells (OSCs), poly­(3-hexylthiophene) (P3HT) is the best choice as a photovoltaic donor polymer because it can be easily synthesized in the scale of kilograms at low cost. However, non-fullerene acceptors (NFAs) matching with P3HT for high performance OSCs are very rare. Herein, by introducing oxygen atoms into the side chains or the fused-ring core of indaceno­[1,2-b:5,6-b′]­dithiophene, we synthesized two new A2–A1–D–A1–A2 type NFAs, where benzotriazole (BTA) and 2-(1,1-dicyanomethylene)­rhodanine were used as the bridged A1 and terminal A2, respectively. The final NFAs, named BTA43 and BTA53, show wider absorption spectra and enhanced intermolecular/intramolecular interaction in comparison with their analogue BTA3 without oxygen atoms. The photovoltaic devices based on P3HT:BTA43 and P3HT:BTA53 can achieve a high power conversion efficiency of 6.56 and 6.31%, respectively, which are obviously higher than that of BTA3 (5.64%). Our results provide a simple and effective strategy to design promising NFAs to pair with the classic photovoltaic polymer P3HT.

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