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Title: Deciphering the degradation mechanism of the lead-free all inorganic perovskite Cs 2SnI 6

Abstract

Organic-inorganic perovskite materials are revolutionizing photovoltaics with high power conversion efficiencies, but experience significant environmental degradation and instability. In this work, the phase stability and decomposition mechanisms of lead-free all inorganic Cs 2SnI 6 perovskite upon water and moisture exposure were systematically investigated via in situ synchrotron X-ray diffraction, environmental SEM, and micro-Raman spectroscopy. A critical relative humidity (80%) is identified below which Cs 2SnI 6 perovskite is stable without decomposition. Under higher humidity or aqueous environment, Cs 2SnI 6 perovskite decomposes into SnI 4 and CsI through etch pits formation and stepwave propagation, leading to rapid crystal dissolution. A partial reversibility of the Cs 2SnI 6 perovskite upon dissolution and re-precipitation with subsequent dehydration was identified, suggesting a self-healing capability of Cs 2SnI 6 and thus enhanced air stability. Furthermore, mechanistic understanding of the Cs 2SnI 6 degradation behavior can be a vital step towards developing new perovskites with enhanced environmental stability and materials performance.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1]; ORCiD logo [1]
  1. Rensselaer Polytechnic Inst., Troy, NY (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Performance and Design of Nuclear Waste Forms and Containers (WastePD); rgonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Energy Frontier Research Center; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1564085
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
npj Materials Degradation
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2397-2106
Publisher:
Springer
Country of Publication:
United States
Language:
English

Citation Formats

Zhu, Weiguang, Xin, Guoqing, Scott, Spencer M., Xu, Wenqian, Yao, Tiankai, Gong, Bowen, Wang, Yachun, Li, Mingxin, and Lian, Jie. Deciphering the degradation mechanism of the lead-free all inorganic perovskite Cs2SnI6. United States: N. p., 2019. Web. doi:10.1038/s41529-019-0068-3.
Zhu, Weiguang, Xin, Guoqing, Scott, Spencer M., Xu, Wenqian, Yao, Tiankai, Gong, Bowen, Wang, Yachun, Li, Mingxin, & Lian, Jie. Deciphering the degradation mechanism of the lead-free all inorganic perovskite Cs2SnI6. United States. doi:10.1038/s41529-019-0068-3.
Zhu, Weiguang, Xin, Guoqing, Scott, Spencer M., Xu, Wenqian, Yao, Tiankai, Gong, Bowen, Wang, Yachun, Li, Mingxin, and Lian, Jie. Fri . "Deciphering the degradation mechanism of the lead-free all inorganic perovskite Cs2SnI6". United States. doi:10.1038/s41529-019-0068-3. https://www.osti.gov/servlets/purl/1564085.
@article{osti_1564085,
title = {Deciphering the degradation mechanism of the lead-free all inorganic perovskite Cs2SnI6},
author = {Zhu, Weiguang and Xin, Guoqing and Scott, Spencer M. and Xu, Wenqian and Yao, Tiankai and Gong, Bowen and Wang, Yachun and Li, Mingxin and Lian, Jie},
abstractNote = {Organic-inorganic perovskite materials are revolutionizing photovoltaics with high power conversion efficiencies, but experience significant environmental degradation and instability. In this work, the phase stability and decomposition mechanisms of lead-free all inorganic Cs2SnI6 perovskite upon water and moisture exposure were systematically investigated via in situ synchrotron X-ray diffraction, environmental SEM, and micro-Raman spectroscopy. A critical relative humidity (80%) is identified below which Cs2SnI6 perovskite is stable without decomposition. Under higher humidity or aqueous environment, Cs2SnI6 perovskite decomposes into SnI4 and CsI through etch pits formation and stepwave propagation, leading to rapid crystal dissolution. A partial reversibility of the Cs2SnI6 perovskite upon dissolution and re-precipitation with subsequent dehydration was identified, suggesting a self-healing capability of Cs2SnI6 and thus enhanced air stability. Furthermore, mechanistic understanding of the Cs2SnI6 degradation behavior can be a vital step towards developing new perovskites with enhanced environmental stability and materials performance.},
doi = {10.1038/s41529-019-0068-3},
journal = {npj Materials Degradation},
number = 1,
volume = 3,
place = {United States},
year = {2019},
month = {2}
}

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