In situ Investigation of Water Interaction with Lead-Free All Inorganic Perovskite (Cs ₂ SnI _x Cl _6–x )

Journal Article · Fri Mar 22 00:00:00 EDT 2019 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.9b00720· OSTI ID:1548287

Zhu, Weiguang ^[1]; Yao, Tiankai ^[1]; Shen, Junhua ^[1]; Xu, Wenqian ^[2]; Gong, Bowen ^[1]; Wang, Yachun ^[1]; Lian, Jie  ^[1]

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1. Rensselaer Polytechnic Inst., Troy, NY (United States)
2. Argonne National Lab. (ANL), Lemont, IL (United States)

Hybrid halide perovskites display a great tunability of optoelectronic properties and environmental stability by controlling the halogen anions (e.g., I, Cl, and Br). Yet, their water interaction and degradation mechanisms are not completely elucidated. In this work, the interaction of Cs₂SnCl₆ and Cl-enriched solid solution Cs₂SnI_0.9Cl_5.1 with water was systematically studied by in situ synchrotron X-ray diffraction and micro-Raman spectra and compared with the isostructural Cs₂SnI₆. Unlike Cs₂SnI₆, which experiences a direct dissolution in water, Cs₂SnCl₆ displays an enhanced stability and the dissolution of the Cs₂SnCl₆ accompanies with the formation of an amorphous alteration phase. Under controlled dehydration conditions, two-dimensional Cs₂SnCl₆ flakes can be precipitated out from water solution. Moreover, the mixed halide perovskite (Cs₂SnI_0.9Cl_5.1) experiences fast iodide dissolution in water solution and transforms to a more chloride-enriched perovskite which shows a behavior similar to Cs₂SnCl₆. The mechanistic understanding of the dissolution–precipitation process of Cs₂SnI_xCl_6–x perovskites is useful for developing new perovskites with varied halogen and controlled environmental stability.

• Research Organization: Energy Frontier Research Centers (EFRC) (United States). Center for Performance and Design of Nuclear Waste Forms and Containers (WastePD); Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-06CH11357; SC0016584
• OSTI ID: 1548287
• Journal Information: Journal of Physical Chemistry. C, Vol. 123, Issue 14; ISSN 1932-7447
• Publisher: American Chemical Society
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Hybrid halide perovskites
water interaction
iodide dissolution
recrystallization