title: Pseudohalide-induced moisture tolerance in perovskite CH3 NH3 Pb(SCN)2 I thin films.
abstract: Two pseudohalide thiocyanate ions (SCN(-) ) have been used to replace two iodides in CH3 NH3 PbI3 , and the resulting perovskite material was used as the active material in solar cells. In accelerated stability tests, the CH3 NH3 Pb(SCN)2 I perovskite films were shown to be superior to the conventional CH3 NH3 PbI3 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 CH3 NH3 PbI3 films degraded in less than 1.5 hours. Solar cells based on CH3 NH3 Pb(SCN)2 I thin films exhibited an efficiency of 8.3 %, which is comparable to that of CH3 NH3 PbI3 based cells fabricated in the same way.
authors.affiliation: Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115 (USA).
authors.forename: Qinglong
authors.initials: Q
authors.lastname: Jiang
authors.affiliation: Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115 (USA).
authors.forename: Dominic
authors.initials: D
authors.lastname: Rebollar
authors.affiliation: Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115 (USA).
authors.forename: Jue
authors.initials: J
authors.lastname: Gong
authors.affiliation: Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115 (USA).
authors.forename: Elettra L
authors.initials: EL
authors.lastname: Piacentino
authors.affiliation: Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115 (USA).
authors.forename: Chong
authors.initials: C
authors.lastname: Zheng
authors.affiliation: Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115 (USA). txu@niu.edu.
authors.forename: Tao
authors.initials: T
authors.lastname: Xu
keywords: moisture tolerance; perovskite phases; pseudohalides; solar cells; thiocyanates