Polymer Solar Cells with 18.74% Efficiency: From Bulk Heterojunction to Interdigitated Bulk Heterojunction,Advanced Functional Materials

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Polymer Solar Cells with 18.74% Efficiency: From Bulk Heterojunction to Interdigitated Bulk Heterojunction
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-10-13 , DOI: 10.1002/adfm.202108797
Xiaopeng Xu ₁ , Liyang Yu ₁ , Huifeng Meng ₁ , Liming Dai ₂ , He Yan ₃ , Ruipeng Li ₄ , Qiang Peng ₁

Affiliation

The most popular approach to fabricating organic solar cells (OSCs) is solution processing a mixture of donor (D) and acceptor (A) materials into an active layer with a bulk heterojunction (BHJ) nanostructure. Herein, it is demonstrated that the interdigitated heterojunction (IHJ) is a more suitable nanostructure of the active layer for high-performance OSCs whereas it is a long standing challenge to realize well-defined IHJ structures. In this study, a facile and versatile sequential solution processing method is developed to produce an IHJ nanostructure with power conversion efficiency reaching 18.74% (18.10% for BHJ the counterpart) by fabricating a donor film with nanopores created by a wax additive, sequentially casting the acceptor on top of infiltrating the nanopores. Compared to the BHJ, the IHJ structure with an interpillar distance within the exciton diffusion length can afford a large bulk D/A interface for efficient exciton dissociation with a minimized charge recombination while free electrons and holes can transport to the respective electrodes through more straightforward pathways, thus enhance performance. Furthermore, the D or A phase in the IHJ device contacts with only one electrode, which can prevent shunting between the anode and cathode and facilitate the industrial mass production of OSCs.

中文翻译：

效率为 18.74% 的聚合物太阳能电池：从体异质结到叉指体异质结

制造有机太阳能电池 (OSC) 的最流行方法是将施主 (D) 和受主 (A) 材料的混合物溶液处理成具有本体异质结 (BHJ) 纳米结构的有源层。在这里，证明了叉指异质结（IHJ）是一种更适合高性能OSC的有源层纳米结构，而实现定义明确的IHJ结构是一个长期存在的挑战。在这项研究中，开发了一种简便且通用的顺序溶液处理方法，通过制造具有由蜡添加剂产生的纳米孔的供体薄膜，依次浇铸受体在渗入纳米孔的顶部。与 BHJ 相比，在激子扩散长度内具有柱间距离的 IHJ 结构可以提供大的体 D/A 界面，以实现有效的激子解离，同时最大限度地减少电荷复合，而自由电子和空穴可以通过更直接的路径传输到各自的电极，从而提高性能。此外，IHJ器件中的D相或A相仅与一个电极接触，可以防止阳极和阴极之间的分流，有利于OSC的工业化大规模生产。

更新日期：2021-10-13

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