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Title: B-Site Metal Cation Exchange in Halide Perovskites

Here, we demonstrate exchange of the B-site metal cation in hybrid organic-inorganic halide perovskite thin films. We exchange tin in formamidinium tin triiodide (NH 2) 2SnI 3' or FASnI 3) with lead at controllable levels, forming (CH- (NH 2) 2SnI xPB 1-xI 3 alloys with partial substitution and fully converting the film to CH(NH 2) 2PbI 3 with a large excess of Pb 2+. 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(NH 2) 2PbI 3 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.
Authors:
ORCiD logo [1] ; ORCiD logo [1]
  1. Univ. of Washington, Seattle, WA (United States). Dept. of Chemistry
Publication Date:
Grant/Contract Number:
SC0013957; ECC-1542101
Type:
Published Article
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 2; Journal Issue: 5; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Research Org:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Washington Research Foundation, Seattle, WA (United States); National Science Foundation (NSF); National Institutes of Health (NIH)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1361564
Alternate Identifier(s):
OSTI ID: 1425734