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

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) nanopar...

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Bibliographic Details
Published in:Nature communications 2020-06, Vol.11 (1), p.3008-3008, Article 3008
Main Authors: Nakamura, Tomoya, Yakumaru, Shinya, Truong, Minh Anh, Kim, Kyusun, Liu, Jiewei, Hu, Shuaifeng, Otsuka, Kento, Hashimoto, Ruito, Murdey, Richard, Sasamori, Takahiro, Kim, Hyung Do, Ohkita, Hideo, Handa, Taketo, Kanemitsu, Yoshihiko, Wakamiya, Atsushi
Format: Article
Language:English
Subjects:
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Commercialization
Defects
Density
Efficiency
Energy conversion efficiency
Fluorides
Humanities and Social Sciences
Impurities
multidisciplinary
Nanoparticles
Open circuit voltage
Oxidation
Perovskites
Photoluminescence
Photons
Photovoltaic cells
Photovoltaics
Precursors
Science
Science (multidisciplinary)
Solar cells
Solar power
Tin
Titanium nitride
Toxicity
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Summary: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. Tin based perovskites are easily oxidized, which generates large density of defects and compromised the solar cell efficiency. Here Nakamura et al. add metallic tin nanoparticles in the precursor solution to suppress tin (IV) impurities and enable high efficiency tin based perovskite solar cells.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-16726-3