Chen Weichao, Huang Gongyue, Li Xiaoming, Wang Huan, Li Yonghai, Jiang Huanxiang, Zheng Nan, Yang Renqiang
College of Textiles & Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Collaborative Innovation Center for Eco-textiles of Shandong Province , Qingdao University , Qingdao 266071 , China.
CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology , Chinese Academy of Sciences , Qingdao 266101 , China.
ACS Appl Mater Interfaces. 2018 Dec 12;10(49):42747-42755. doi: 10.1021/acsami.8b16554. Epub 2018 Nov 30.
In this work, we have reported a highly efficient photovoltaic material, PBDTTz-SBP, by fine-tuning the side chains of the benzodithiophene (BDT) unit. With the replacement of alkoxy chains with alkylthio chains, a large increase in power conversion efficiency (PCE) was realized. Non-fullerene polymer solar cells (PSCs) without any post-treatment generate an optimal PCE of up to 12.09%, with a high V of 0.914 V, J of 18.52 mA cm, and fill factor of 71.43%. Notably, the efficiency of a PBDTTz-SBP-based solar cell was about 1.31-fold of the PCE (9.20%) of its counterpart based on the polymer, PBDTTz-BP, with alkoxy chains, indicating the striking modulation effect of side-chain engineering. Although V and J were lower than those of non-fullerene devices, the PSCs with PCBM as the acceptor exhibited a fairly high fill factor of up to 76.69%, affording a moderate PCE. Our work reported a highly efficient polymer solar cell with a PCE of 12.09% and clearly demonstrated the great tuning effect of alkylthio chains on photovoltaic performance.
在本工作中，我们通过微调苯并二噻吩（BDT）单元的侧链，报道了一种高效的光伏材料PBDTTz-SBP。用烷硫基链取代烷氧基链后，功率转换效率（PCE）大幅提高。未经任何后处理的非富勒烯聚合物太阳能电池（PSC）产生的最佳PCE高达12.09%，具有0.914 V的高开路电压、18.52 mA cm的电流密度和71.43%的填充因子。值得注意的是，基于PBDTTz-SBP的太阳能电池的效率约为基于含烷氧基链的聚合物PBDTTz-BP的对应物的PCE（9.20%）的1.31倍，表明侧链工程具有显著的调制效果。尽管开路电压和电流密度低于非富勒烯器件，但以PCBM为受体的PSC表现出高达76.69%的相当高的填充因子，提供了中等的PCE。我们的工作报道了一种PCE为12.09%的高效聚合物太阳能电池，并清楚地证明了烷硫基链对光伏性能的巨大调节作用。
