Sn(IV)-free tin perovskite films realized by in situ Sn(0) nanoparticle treatment of the precursor solution

Tomoya Nakamura, Shinya Yakumaru, Minh Anh Truong, Kyusun Kim, Jiewei Liu, Shuaifeng Hu, Kento Otsuka, Ruito Hashimoto, Richard Murdey, Takahiro Sasamori, Hyung Do Kim, Hideo Ohkita, Taketo Handa, Yoshihiko Kanemitsu and Atsushi Wakamiya ()
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Tomoya Nakamura: Kyoto University, Gokasho, Uji
Shinya Yakumaru: Kyoto University, Gokasho, Uji
Minh Anh Truong: Kyoto University, Gokasho, Uji
Kyusun Kim: Kyoto University, Gokasho, Uji
Jiewei Liu: Kyoto University, Gokasho, Uji
Shuaifeng Hu: Kyoto University, Gokasho, Uji
Kento Otsuka: Kyoto University, Gokasho, Uji
Ruito Hashimoto: Kyoto University, Gokasho, Uji
Richard Murdey: Kyoto University, Gokasho, Uji
Takahiro Sasamori: Nagoya City University
Hyung Do Kim: Kyoto University
Hideo Ohkita: Kyoto University
Taketo Handa: Kyoto University, Gokasho, Uji
Yoshihiko Kanemitsu: Kyoto University, Gokasho, Uji
Atsushi Wakamiya: Kyoto University, Gokasho, Uji

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

Abstract: Abstract The toxicity of lead perovskite hampers the commercialization of perovskite-based photovoltaics. While tin perovskite is a promising alternative, the facile oxidation of tin(II) to tin(IV) causes a high density of defects, resulting in lower solar cell efficiencies. Here, we show that tin(0) nanoparticles in the precursor solution can scavenge tin(IV) impurities, and demonstrate that this treatment leads to effectively tin(IV)-free perovskite films with strong photoluminescence and prolonged decay lifetimes. These nanoparticles are generated by the selective reaction of a dihydropyrazine derivative with the tin(II) fluoride additive already present in the precursor solution. Using this nanoparticle treatment, the power conversion efficiency of tin-based solar cells reaches 11.5%, with an open-circuit voltage of 0.76 V. Our nanoparticle treatment is a simple and broadly effective method that improves the purity and electrical performance of tin perovskite films.

Date: 2020
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DOI: 10.1038/s41467-020-16726-3

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