Polymer Solar Cells with 18.74 Efficiency: From Bulk Heterojunction to Interdigitated Bulk Heterojunction

Xu Xiaopeng; Yu Liyang; Meng HuifengDai LimingYan HeLi RuipengPeng Qiang

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Polymer Solar Cells with 18.74 Efficiency: From Bulk Heterojunction to Interdigitated Bulk Heterojunction

机译：Polymer Solar Cells with 18.74 Efficiency: From Bulk Heterojunction to Interdigitated Bulk Heterojunction

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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.

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来源
《Advanced functional materials》 |2022年第4期|2108797.1-2108797.8|共8页
作者
Xu Xiaopeng; Yu Liyang; Meng HuifengDai LimingYan HeLi RuipengPeng Qiang;
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作者单位

Sichuan Univ, Sch Chem Engn, Key Lab Green Chem & Technol, Minist Educ, Chengdu 610065, Sichuan, Peoples R China|Sichuan Univ, State Key Lab Polymer Mat Engn, Chengdu 610065, Sichuan, Peoples R China;

Univ New South Wales, Sch Chem Engn, Australian Carbon Mat Ctr A CMC, Sydney, NSW 2052, Australia;

Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R China|Hong Kong Univ Sci & Technol, Hong Kong Branch, Chinese Natl Engn Res Ctr Tissue Restorat & Recon, Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R CNatl Synchrotron Light Source II Brookhaven Natl, Upton, NY 11973 USA;

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正文语种英语
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interdigitated heterojunctions; morphology; nanopores; polymer solar cells; sequential deposition;

Polymer Solar Cells with 18.74 Efficiency: From Bulk Heterojunction to Interdigitated Bulk Heterojunction

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