Robust metal ion-chelated polymer interfacial layer for ultraflexible non-fullerene organic solar cells

Fei Qin, Wen Wang, Lulu Sun, Xueshi Jiang, Lin Hu, Sixing Xiong, Tiefeng Liu, Xinyun Dong, Jing Li, Youyu Jiang, Jianhui Hou, Kenjiro Fukuda, Takao Someya and Yinhua Zhou ()
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Fei Qin: Huazhong University of Science and Technology
Wen Wang: Huazhong University of Science and Technology
Lulu Sun: Huazhong University of Science and Technology
Xueshi Jiang: Huazhong University of Science and Technology
Lin Hu: Huazhong University of Science and Technology
Sixing Xiong: Huazhong University of Science and Technology
Tiefeng Liu: Huazhong University of Science and Technology
Xinyun Dong: Huazhong University of Science and Technology
Jing Li: Huazhong University of Science and Technology
Youyu Jiang: Huazhong University of Science and Technology
Jianhui Hou: Chinese Academy of Sciences
Kenjiro Fukuda: RIKEN
Takao Someya: RIKEN
Yinhua Zhou: Huazhong University of Science and Technology

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Achieving high power conversion efficiency and good mechanical robustness is still challenging for the ultraflexible organic solar cells. Interlayers simultaneously having good mechanical robustness and good chemical compatibility with the active layer are highly desirable. In this work, we present an interlayer of Zn2+-chelated polyethylenimine (denoted as PEI-Zn), which can endure a maximum bending strain over twice as high as that of ZnO and is chemically compatible with the recently emerging efficient nonfullerene active layers. On 1.3 μm polyethylene naphthalate substrates, ultraflexible nonfullerene solar cells with the PEI-Zn interlayer display a power conversion efficiency of 12.3% on PEDOT:PSS electrodes and 15.0% on AgNWs electrodes. Furthermore, the ultraflexible cells show nearly unchanged power conversion efficiency during 100 continuous compression-flat deformation cycles with a compression ratio of 45%. At the end, the ultraflexible cell is demonstrated to be attached onto the finger joint and displays reversible current output during the finger bending-spreading.

Date: 2020
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DOI: 10.1038/s41467-020-18373-0

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