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Angular-Shaped Dithienonaphthalene-Based Nonfullerene Acceptor for High-Performance Polymer Solar Cells with Large Open-Circuit Voltages and Minimal Energy Losses
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acs.chemmater.7b03770 Yunlong Ma 1, 2 , Meiqi Zhang 1, 2 , Yabing Tang 3 , Wei Ma 3 , Qingdong Zheng 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acs.chemmater.7b03770 Yunlong Ma 1, 2 , Meiqi Zhang 1, 2 , Yabing Tang 3 , Wei Ma 3 , Qingdong Zheng 1
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The utilization of low bandgap copolymers has been considered as one of the most efficient ways to increase power conversion efficiencies (PCEs) of fullerene-based polymer solar cells (PSCs). However, an increase in the short-circuit current (JSC) value is usually counteracted by a decrease in the open-circuit voltage (VOC), which limits a further PCE enhancement of fullerene-based PSCs. As a result, nonfullerene acceptors with wide-range tunable energy levels are used as alternatives to the traditional fullerene acceptors to overcome the negative trade-off between the JSC and VOC. Here, a novel nonfullerene acceptor is developed by using an angular-shaped dithienonaphthalene flanked by electron-withdrawing 3-ethylrhodanine units via benzothiadiazole bridges. The obtained nonfullerene acceptor exhibits a high-lying lowest unoccupied molecular orbital level of −3.75 eV with enhanced absorption. In combination with a benchmark low bandgap copolymer (PTB7-Th), a high PCE of 9.51% with a large VOC of 1.08 V was achieved for the nonfullerene PSCs, demonstrating an extremely low energy loss of 0.50 eV, which is the lowest among all high-performance (PCE > 8%) polymer-based systems with similar optical bandgaps. The results demonstrate the bright future of our nonfullerene acceptor as an alternative to the fullerene derivatives for PSCs with large JSC and VOC values and improved device stability.
中文翻译：
用于大开路电压且能量损失最小的高性能聚合物太阳能电池的角形二噻吩萘基非富勒烯受体
低带隙共聚物的利用已经被认为是提高基于富勒烯的聚合物太阳能电池（PSC）的功率转换效率（PCE）的最有效方法之一。但是，短路电流（J SC）值的增加通常由开路电压（V OC）的降低来抵消，这限制了基于富勒烯的PSC的PCE进一步提高。其结果是，与nonfullerene受体宽范围可调能级用来替代传统的富勒烯受体克服之间的负折衷Ĵ SC和V OC。在此，通过使用角形的二噻吩萘开发了新型的非富勒烯受体，该二噻吩萘的侧翼是经由苯并噻二唑桥的吸电子3-乙基罗丹宁单元。所获得的非富勒烯受体表现出高的最低未占据分子轨道能级，为-3.75 eV，具有增强的吸收。在与基准低带隙共聚物（PTB7-TH），9.51％具有大高PCE组合V OC 1.08的V是为nonfullerene省电类别来实现，这表明0.50电子伏特，这是中最低的极低的能量损失具有类似光学带隙的所有高性能（PCE> 8％）聚合物系统。结果表明，对于具有较大J SC的PSC，我们的非富勒烯受体可以替代富勒烯衍生物，具有广阔的前景和V OC值，并改善了器件的稳定性。
更新日期：2017-11-08
中文翻译：
用于大开路电压且能量损失最小的高性能聚合物太阳能电池的角形二噻吩萘基非富勒烯受体
低带隙共聚物的利用已经被认为是提高基于富勒烯的聚合物太阳能电池（PSC）的功率转换效率（PCE）的最有效方法之一。但是，短路电流（J SC）值的增加通常由开路电压（V OC）的降低来抵消，这限制了基于富勒烯的PSC的PCE进一步提高。其结果是，与nonfullerene受体宽范围可调能级用来替代传统的富勒烯受体克服之间的负折衷Ĵ SC和V OC。在此，通过使用角形的二噻吩萘开发了新型的非富勒烯受体，该二噻吩萘的侧翼是经由苯并噻二唑桥的吸电子3-乙基罗丹宁单元。所获得的非富勒烯受体表现出高的最低未占据分子轨道能级，为-3.75 eV，具有增强的吸收。在与基准低带隙共聚物（PTB7-TH），9.51％具有大高PCE组合V OC 1.08的V是为nonfullerene省电类别来实现，这表明0.50电子伏特，这是中最低的极低的能量损失具有类似光学带隙的所有高性能（PCE> 8％）聚合物系统。结果表明，对于具有较大J SC的PSC，我们的非富勒烯受体可以替代富勒烯衍生物，具有广阔的前景和V OC值，并改善了器件的稳定性。
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