title: Efficient and stable perovskite solar cells prepared in ambient air irrespective of the humidity.
abstract: Poor stability of organic-inorganic halide perovskite materials in humid condition has hindered the success of perovskite solar cells in real applications since controlled atmosphere is required for device fabrication and operation, and there is a lack of effective solutions to this problem until now. Here we report the use of lead (II) thiocyanate (Pb(SCN)2) precursor in preparing perovskite solar cells in ambient air. High-quality CH3NH3PbI3-x(SCN)x perovskite films can be readily prepared even when the relative humidity exceeds 70%. Under optimized processing conditions, we obtain devices with an average power conversion efficiency of 13.49% and the maximum efficiency over 15%. In comparison with typical CH3NH3PbI3-based devices, these solar cells without encapsulation show greatly improved stability in humid air, which is attributed to the incorporation of thiocyanate ions in the crystal lattice. The findings pave a way for realizing efficient and stable perovskite solar cells in ambient atmosphere.
authors.affiliation: Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, 999077 Kowloon, Hong Kong.|Institute for Interdisciplinary Research and Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, 430056 Wuhan, China.
authors.forename: Qidong
authors.initials: Q
authors.lastname: Tai
authors.affiliation: Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, 999077 Kowloon, Hong Kong.
authors.forename: Peng
authors.initials: P
authors.lastname: You
authors.affiliation: Institute for Interdisciplinary Research and Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, 430056 Wuhan, China.
authors.forename: Hongqian
authors.initials: H
authors.lastname: Sang
authors.affiliation: Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, 999077 Kowloon, Hong Kong.
authors.forename: Zhike
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Institute for Interdisciplinary Research and Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, 430056 Wuhan, China.
authors.forename: Chenglong
authors.initials: C
authors.lastname: Hu
authors.affiliation: Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, 999077 Kowloon, Hong Kong.
authors.forename: Helen L W
authors.initials: HL
authors.lastname: Chan
authors.affiliation: Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, 999077 Kowloon, Hong Kong.
authors.forename: Feng
authors.initials: F
authors.lastname: Yan