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Lead‐Free Double Perovskite Cs 2 SnX 6 : Facile Solution Synthesis and Excellent Stability
Author(s) -
Han Xiao,
Liang Jia,
Yang JiHui,
Soni Khushboo,
Fang Qiyi,
Wang Weipeng,
Zhang Jing,
Jia Shuai,
Martí Angel A.,
Zhao Yan,
Lou Jun
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201901650
Subject(s) - materials science , perovskite (structure) , halide , chemical stability , limiting , phase (matter) , enthalpy , lead (geology) , vacancy defect , chemical engineering , nanotechnology , crystallography , inorganic chemistry , chemistry , thermodynamics , organic chemistry , mechanical engineering , physics , geomorphology , engineering , geology
Abstract Long‐term instability and possible lead contamination are the two main issues limiting the widespread application of organic–inorganic lead halide perovskites. Here a facile and efficient solution‐phase method is demonstrated to synthesize lead‐free Cs 2 SnX 6 (X = Br, I) with a well‐defined crystal structure, long‐term stability, and high yield. Based on the systematic experimental data and first‐principle simulation results, Cs 2 SnX 6 displays excellent stability against moisture, light, and high temperature, which can be ascribed to the unique vacancy‐ordered defect‐variant structure, stable chemical compositions with Sn 4+ , as well as the lower formation enthalpy for Cs 2 SnX 6 . Additionally, photodetectors based on Cs 2 SnI 6 are also fabricated, which show excellent performance and stability. This study provides very useful insights into the development of lead‐free double perovskites with high stability.