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Tandem Organic Solar Cells with 18.7% Efficiency Enabled by Suppressing the Charge Recombination in Front Sub-Cell
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-05-06 , DOI: 10.1002/adfm.202103283
Gongchu Liu 1 , Ruoxi Xia 1 , Qiri Huang 1 , Kai Zhang 1 , Zhicheng Hu 1 , Tao Jia 1 , Xiang Liu 1 , Hin‐Lap Yip 1 , Fei Huang 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-05-06 , DOI: 10.1002/adfm.202103283
Gongchu Liu 1 , Ruoxi Xia 1 , Qiri Huang 1 , Kai Zhang 1 , Zhicheng Hu 1 , Tao Jia 1 , Xiang Liu 1 , Hin‐Lap Yip 1 , Fei Huang 1
Affiliation
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The maximum photocurrent in tandem organic solar cells (TOSCs) is often obtained by increasing the thicknesses of sub-cells, which leads to recombination enhancement of such devices and compromises their power conversion efficiency (PCE). In this work, an efficient interconnecting layer (ICL) is developed, with the structure ZnO NPs:PEI/PEI/PEDOT:PSS, which enables TOSCs with very good reproducibility. Then, it is discovered that the optimal thickness of the front sub-cell in such TOSCs can be reduced by increasing the proportion of a non-fullerene acceptor in the active layer. The non-fullerene acceptor used in this work has a much larger absorption coefficient than the donor in the front sub-cell, and the absorption reduction of donor can be well complemented by that of the acceptor when increasing the acceptor proportion, thus leading to a significant overall absorption enhancement even with a thinner film. As a result, the optimal thickness of the front sub-cell is reduced and its charge recombination is suppressed. Ultimately, the use of this ICL combined with fine-turning of the composition in the front sub-cell enables an efficient TOSC with a very high fill factor of 78% and an excellent PCE of 18.71% (certified by an accredited institute to be 18.09%) to be obtained.
中文翻译：
通过抑制前子电池中的电荷复合实现效率为 18.7% 的串联有机太阳能电池
串联有机太阳能电池 (TOSC) 中的最大光电流通常通过增加子电池的厚度来获得，这会导致此类器件的复合增强并损害其功率转换效率 (PCE)。在这项工作中，开发了一种高效的互连层 (ICL)，其结构为 ZnO NPs:PEI/PEI/PEDOT:PSS，这使得 TOSCs 具有非常好的重现性。然后，发现可以通过增加活性层中非富勒烯受体的比例来降低此类 TOSC 中前子电池的最佳厚度。本工作中使用的非富勒烯受体比前子电池中的供体具有更大的吸收系数，并且当增加受体比例时，供体的吸收减少可以很好地补充，因此，即使使用更薄的薄膜，也能显着提高整体吸收。结果，减小了前子电池的最佳厚度并抑制了其电荷复合。最终，该 ICL 的使用与前子电池中成分的微调相结合，实现了具有 78% 非常高填充因子和 18.71% 优异 PCE（经认可机构认证为 18.09）的高效 TOSC %) 获得。
更新日期：2021-05-06
中文翻译：
通过抑制前子电池中的电荷复合实现效率为 18.7% 的串联有机太阳能电池
串联有机太阳能电池 (TOSC) 中的最大光电流通常通过增加子电池的厚度来获得，这会导致此类器件的复合增强并损害其功率转换效率 (PCE)。在这项工作中，开发了一种高效的互连层 (ICL)，其结构为 ZnO NPs:PEI/PEI/PEDOT:PSS，这使得 TOSCs 具有非常好的重现性。然后，发现可以通过增加活性层中非富勒烯受体的比例来降低此类 TOSC 中前子电池的最佳厚度。本工作中使用的非富勒烯受体比前子电池中的供体具有更大的吸收系数，并且当增加受体比例时，供体的吸收减少可以很好地补充，因此，即使使用更薄的薄膜，也能显着提高整体吸收。结果，减小了前子电池的最佳厚度并抑制了其电荷复合。最终，该 ICL 的使用与前子电池中成分的微调相结合，实现了具有 78% 非常高填充因子和 18.71% 优异 PCE（经认可机构认证为 18.09）的高效 TOSC %) 获得。
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