B-Site Metal Cation Exchange in Halide Perovskites

Eperon, Giles E.; Ginger, David S.

doi:10.1021/acsenergylett.7b00290

Title: B-Site Metal Cation Exchange in Halide Perovskites

Journal Article · Tue May 02 00:00:00 EDT 2017 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.7b00290· OSTI ID:1361564

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Univ. of Washington, Seattle, WA (United States). Dept. of Chemistry

e demonstrate exchange of the B-site metal cation in hybrid organic-inorganic halide perovskite thin films. We exchange tin in formamidinium tin triiodide (CH- (NH2)2SnI3, or FASnI3) with lead at controllable levels, forming CH(NH2)2SnxPb1-xI3 alloys with partial substitution and fully converting the film to CH(NH2)2PbI3 with a large excess of Pb2+. We observe no evidence for phase segregation or bilayered films, indicating that conversion is uniform throughout the film. This facile technique provides a new way to control composition independently from the crystallization processes, allowing formation of the black phase of CH(NH2)2PbI3 at much lower temperatures than those previously reported while also opening the door to new morphology-composition combinations. The surprising observation that the B-site metal cations are mobile may also provide insight into the nature of transient processes in these materials, suggesting that they may be involved in ionic conduction, and will be a critical consideration for long-term stability.

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Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Washington Research Foundation, Seattle, WA (United States); National Science Foundation (NSF); National Institutes of Health (NIH)

Grant/Contract Number:: SC0013957; ECC-1542101

OSTI ID:: 1361564

Alternate ID(s):: OSTI ID: 1425734; OSTI ID: 1508256

Journal Information:: ACS Energy Letters, Journal Name: ACS Energy Letters Vol. 2 Journal Issue: 5; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 94 works

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