Crystal Growth Management of CuSCN for Perovskite Solar Cells
Atsushi Kogo a
a National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 1-1-1 Higashi, Ibaraki, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
Kobe, Japan, 2023 January 22nd - 24th
Organizers: Seigo Ito, Hideo Ohkita and Atsushi Wakamiya
Invited Speaker Session, Atsushi Kogo, presentation 022
Publication date: 21st November 2022

Organolead halide perovskite solar cells have been attracting enormous attention as high efficiency and cost-effective solar cells. However, they suffer from low stability under heat, light, and humid condition due to instability of organic hole-transport materials such as spiro-OMeTAD. To address this issue, robust inorganic CuSCN as an alternative hole-transport material has been developed. The solution-processed CuSCN-based perovskite solar cells exhibit low efficiency compared to conventional spiro-OMeTAD-based solar cells owing to low crystallinity and ununiform morphology of the CuSCN layers. Here in this study, we demonstrate crystal control of CuSCN layers by tuning atmospheric condition during the aging process and post-treatment. The enhanced crystallinity of CuSCN layers at high humidity exhibits higher photovoltaic performance than the layers formed by conventional coating condition. Post-treatment with various solvents to CuSCN further improved crystallinity and yielded the layers of flat and uniform morphology resulting in high power conversion efficiency and high stability of solar cells.

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