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Pseudohalide‐Induced Moisture Tolerance in Perovskite CH 3 NH 3 Pb(SCN) 2 I Thin Films
Author(s) -
Jiang Qinglong,
Rebollar Dominic,
Gong Jue,
Piacentino Elettra L.,
Zheng Chong,
Xu Tao
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201503038
Subject(s) - thiocyanate , perovskite (structure) , relative humidity , thin film , chemistry , degradation (telecommunications) , ion , inorganic chemistry , nuclear chemistry , materials science , crystallography , organic chemistry , nanotechnology , telecommunications , physics , computer science , thermodynamics
Two pseudohalide thiocyanate ions (SCN − ) have been used to replace two iodides in CH 3 NH 3 PbI 3 , and the resulting perovskite material was used as the active material in solar cells. In accelerated stability tests, the CH 3 NH 3 Pb(SCN) 2 I perovskite films were shown to be superior to the conventional CH 3 NH 3 PbI 3 films as no significant degradation was observed after the film had been exposed to air with a relative humidity of 95 % for over four hours, whereas CH 3 NH 3 PbI 3 films degraded in less than 1.5 hours. Solar cells based on CH 3 NH 3 Pb(SCN) 2 I thin films exhibited an efficiency of 8.3 %, which is comparable to that of CH 3 NH 3 PbI 3 based cells fabricated in the same way.