skip to main content

DOE PAGESDOE PAGES

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

Eperon, Giles E., and Ginger, David S.. B-Site Metal Cation Exchange in Halide Perovskites. United States: N. p., Web. doi:10.1021/acsenergylett.7b00290.
Eperon, Giles E., & Ginger, David S.. B-Site Metal Cation Exchange in Halide Perovskites. United States. doi:10.1021/acsenergylett.7b00290.
Eperon, Giles E., and Ginger, David S.. 2017. "B-Site Metal Cation Exchange in Halide Perovskites". United States. doi:10.1021/acsenergylett.7b00290.
@article{osti_1361564,
title = {B-Site Metal Cation Exchange in Halide Perovskites},
author = {Eperon, Giles E. and Ginger, David S.},
abstractNote = {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 (NH2) 2SnI3' or FASnI3) with lead at controllable levels, forming (CH- (NH2)2SnIxPB1-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.},
doi = {10.1021/acsenergylett.7b00290},
journal = {ACS Energy Letters},
number = 5,
volume = 2,
place = {United States},
year = {2017},
month = {5}
}