Ternary Organic Solar Cells Based on Two Non‐fullerene Acceptors with Complimentary Absorption and Balanced Crystallinity,Chinese Journal of Chemistry

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Ternary Organic Solar Cells Based on Two Non‐fullerene Acceptors with Complimentary Absorption and Balanced Crystallinity
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-03-26 , DOI: 10.1002/cjoc.201900554
Lan Xie _{1,

2} , Chen Yang _{1,

2} , Ruimin Zhou _{1,

2,

3} , Zhen Wang _{1,

2} , Jianqi Zhang ₁ , Kun Lu ₁ , Zhixiang Wei _{1,

2,

3}

Affiliation

The ternary blend structure has been demonstrated as an effective approach to increase the power conversion efficiency of organic solar cells. An effective approach to enhance the power conversion efficiency of ternary solar cells is based on two non‐fullerene acceptors with complimentary absorption range and balanced crystallinity. In this work, we have introduced a high crystallinity small‐molecule acceptor, named C8IDTT‐4Cl with appropriate alkyl side chains into a low crystalline blend of conjugated polymer donor PBDT‐TPD and fused‐ring electron acceptor ITIC‐4F. A ternary device based on the blend PBDT‐TPD:ITIC‐4F:C8IDTT‐4Cl exhibits a best power conversion efficiency of 9.51% with a simultaneous improvement of the short‐circuit current density to 18.76 mA·cm^–2 and the fill factor up to 67.53%. The absorption onset for C8IDTT‐4Cl is located at 900 nm, so that the well complementary light absorption is beneficial to the photocurrent. In addition, the existence of high crystallinity C8IDTT‐4Cl in the ternary device is found helpful to modulate crystallinity, improve heterojunction morphologies and stacking structure, therefore to realize higher charge mobility and better performance.

中文翻译：

基于两个具有互补吸收和平衡结晶性的非富勒烯受体的三元有机太阳能电池

三元共混结构已被证明是提高有机太阳能电池功率转换效率的有效方法。一种有效的提高三元太阳能电池功率转换效率的方法是基于两个具有互补吸收范围和平衡结晶度的非富勒烯受体。在这项工作中，我们将高结晶度的小分子受体C8IDTT-4Cl与合适的烷基侧链引入到共轭聚合物供体PBDT-TPD和稠环电子受体ITIC-4F的低结晶混合物中。基于PBDT‐TPD：ITIC‐4F：C8IDTT‐4Cl共混物的三元器件具有9.51％的最佳功率转换效率，同时短路电流密度提高到18.76 mA·cm ^–2填充因子高达67.53％。C8IDTT-4Cl的吸收起始点位于900 nm，因此良好互补的光吸收有益于光电流。此外，三元器件中高结晶度的C8IDTT-4Cl的存在有助于调节结晶度，改善异质结形态和堆叠结构，从而实现更高的电荷迁移率和更好的性能。

更新日期：2020-03-26

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