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Identifying tunneling effects of poly(aryl ether) matrices and boosting the efficiency, stability, and stretchability of organic solar cells

Jianhua HanCAS Key Laboratory of Bio-Based Materials Department, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, ChinaFeng BaoState Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, ChinaXunchang WangCAS Key Laboratory of Bio-Based Materials Department, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, ChinaDa HuangShanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, ChinaRenqiang YangKey Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, ChinaChunming YangShanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, ChinaXigao JianState Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, ChinaJinyan WangState Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, ChinaXichang BaoChinese Academy of SciencesJunhao ChuCAS Key Laboratory of Bio-Based Materials Department, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China

2021en

ABI

Annotatsiya

Tunneling effects are one of the most basic theories that have long been overlooked in the bulk-heterojunction (BHJ) layers of organic solar cells (OSCs). Herein, by fabricating BHJ and layer-by-layer (LbL) devices with five different poly(aryl ether)s (PAEs), we reveal a tunneling effect in the active layer of OSCs. The results show that the as-cast devices with 5 wt % and even 30 wt % PAE in PM6:Y6-blends achieve high power conversion efficiencies (PCEs) over 15%. Furthermore, the 5 wt % PAE-based devices with proper post-treatment deliver a PCE of 17.03%. By inserting a thin PAE layer with high dielectric constant, the LbL OSCs (PM6/PAE-237/Y6) yield a 23% improvement PCE compared to one without PAEs. With rational molecular design, we demonstrate that heat-resistant PAE matrices with high stretchability simultaneously improve efficiency, stability, and mechanical flexibility of OSCs. The proposed tunneling effect and PAE matrices strategy have important implications for fabricating efficient, stable, and flexible organic devices.

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DOI: 10.1016/j.xcrp.2021.100408

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