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Additive Effects of Copper and Alkali Metal Halides into Methylammonium Lead Iodide Perovskite Solar Cells

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Abstract

Fabrication and characterization of methylammonium lead iodide perovskite solar cells incorporated with formamidinium iodide, copper halides, alkali metal halides and decaphenylcyclopentasilane were performed. Addition of CuCl and KI at 2% into the perovskite layer offered compact morphologies and crystal orientation in the perovskite layer, improving short circuit current densities, series resistance and open-circuit voltages related to conversion efficiencies. The stabilities of conversion efficiencies were improved for the perovskite layer incorporated with 2% CuCl and 2% NaI. The stabilities depended on the state of the surface morphologies and crystal orientation while suppressing decomposition reaction in the perovskite layer. The photovoltaic mechanisms were associated with promotion of carrier generation and diffusion in the crystalline layer. The electronic correlation was based on the charge transfer between 5p orbital of I ion and 3d orbital of Cu ion near valence band, promoting the carrier generation and diffusion related to the short circuit current densities.

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Acknowledgements

This work was supported by JSPS KAKENHI Grant Number JP 21K05261.

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Authors and Affiliations

  1. Department of Materials Science, The University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga, 522-8533, Japan

    Atsushi Suzuki, Kaede Kitagawa & Takeo Oku

  2. Osaka Gas Chemicals Co., Ltd., 5-11-61 Torishima, Konohana-ku, Osaka, 554-0051, Japan

    Masanobu Okita, Sakiko Fukunishi & Tomoharu Tachikawa

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  1. Atsushi Suzuki
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  2. Kaede Kitagawa
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Correspondence to Atsushi Suzuki.

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Suzuki, A., Kitagawa, K., Oku, T. et al. Additive Effects of Copper and Alkali Metal Halides into Methylammonium Lead Iodide Perovskite Solar Cells. Electron. Mater. Lett. 18, 176–186 (2022). https://doi.org/10.1007/s13391-021-00325-5

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