Ternary small molecule solar cells exhibiting power conversion efficiency of 10.3%
Ternary small molecule solar cells exhibiting power conversion efficiency of 10.3%
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三元%20small%20molecule%20solar%20cells%20exhibiting%20power%20conversion%20efficiency%20of%2010.3%
DOI：
10.1016/j.nanoen.2017.07.044
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发表时间：
2017
期刊：
影响因子：
17.6
通讯作者：
Xinfeng Liu
中科院分区：
文献类型：
--
作者：
Miao Zhang;Jian Wang;Fujun Zhang;Yang Mi;Qiaoshi An;Wenbin Wang;Xiaoling Ma;Jian Zhang;Xinfeng Liu
精心制备的BTR：PC71BM基小分子太阳能电池(SMSCs)表现出9.37%的最高功率转换效率(PCE)，这应该是以前报道的BTR：PC71BM基SMSCs中最高的值之一。在优化的二元SMSCs的基础上，选择小分子DIB-SQ作为制备三元SMSCs的第三组分。供体中含6wt%DIB-SQ的三元SMSCs获得了10.3%的冠军PCE。短路电流密度(JSC)为15.44 mA/cm2，填充因数(Ff)为73.8%，PCE改善约10%。DIB-SQ的主要贡献可以归结为增强了长波长范围内的光子捕获和优化了相分离以改善激子解离和三元有源层中的电荷输运。结果进一步表明，三元策略应该是一种有效和通用的方法来提高SMSC的性能。
The elaborately prepared BTR:PC71BM based small molecule solar cells (SMSCs) exhibit a champion power conversion efficiency (PCE) of 9.37%, which should be among the highest values for previous reports on BTR:PC71BM based SMSCs. Based on the optimized binary SMSCs, small molecule DIB-SQ was selected as the third component to fabricate ternary SMSCs. The champion PCE of 10.3% was achieved for ternary SMSCs with 6 wt% DIB-SQ in donors. An approximate 10% PCE improvement was obtained due to obviously increased short current density (JSC) of 15.44 mA/cm2and fill factor (FF) of 73.8%. The main contribution of DIB-SQ can be summarized as the enhanced photon harvesting in long wavelength range and the optimized phase separation for better exciton dissociation and charge transport in ternary active layer. The results further demonstrate that ternary strategy should be an efficient and versatile method to improve the performance of SMSCs.