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Title: B-Site Metal Cation Exchange in Halide Perovskites

Journal Article · · ACS Energy Letters

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.

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, Vol. 2, Issue 5; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 94 works
Citation information provided by
Web of Science

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Cited By (14)

Rational construction of a scalable heterostructured nanorod megalibrary journal January 2020
Scalable fabrication of high-quality crystalline and stable FAPbI 3 thin films by combining doctor-blade coating and the cation exchange reaction journal January 2019
Lattice anchoring stabilizes solution-processed semiconductors journal May 2019
Perovskite Photovoltaics: The Significant Role of Ligands in Film Formation, Passivation, and Stability journal January 2019
First evidence of macroscale single crystal ion exchange found in lead halide perovskites journal January 2020
Bowing of transport gap in hybrid halide perovskite alloys (CH 3 NH 3 Sn 1− x Pb x I 3 ): Which band is responsible? journal January 2020
Post-synthesis phase and shape evolution of CsPbBr3 colloidal nanocrystals: The role of ligands journal April 2019
Scalable Deposition Methods for Large‐area Production of Perovskite Thin Films journal June 2019
A‐Site Management for Highly Crystalline Perovskites journal November 2019
Partially replacing Pb 2+ by Mn 2+ in hybrid metal halide perovskites: Structural and electronic properties journal December 2018
Lead-free hybrid perovskites for photovoltaics journal January 2018
Morphology and Interface Engineering for Organic Metal Halide Perovskite-Based Photovoltaic Cells journal May 2018
Lateral epitaxial heterojunctions in single nanowires fabricated by masked cation exchange journal February 2018
Lateral epitaxial heterojunctions in single nanowires fabricated by masked cation exchange journal February 2018

Figures / Tables (3)