title: Methylamine-Gas-Induced Defect-Healing Behavior of CH3NH3PbI3 Thin Films for Perovskite Solar Cells.
abstract: We report herein the discovery of methylamine (CH3NH2) induced defect-healing (MIDH) of CH3NH3PbI3 perovskite thin films based on their ultrafast (seconds), reversible chemical reaction with CH3NH2 gas at room temperature. The key to this healing behavior is the formation and spreading of an intermediate CH3NH3PbI3⋅xCH3NH2 liquid phase during this unusual perovskite-gas interaction. We demonstrate the versatility and scalability of the MIDH process, and show dramatic enhancement in the performance of perovskite solar cells (PSCs) with MIDH. This study represents a new direction in the formation of defect-free films of hybrid perovskites.
authors.affiliation: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101 (P.R. China).
authors.forename: Zhongmin
authors.initials: Z
authors.lastname: Zhou
authors.affiliation: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101 (P.R. China).
authors.forename: Zaiwei
authors.initials: Z
authors.lastname: Wang
authors.affiliation: School of Engineering, Brown University, Providence, RI 02912 (USA).
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101 (P.R. China). pangsp@qibebt.ac.cn.
authors.forename: Shuping
authors.initials: S
authors.lastname: Pang
authors.affiliation: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101 (P.R. China).
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.affiliation: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101 (P.R. China).
authors.forename: Hongxia
authors.initials: H
authors.lastname: Xu
authors.affiliation: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101 (P.R. China).
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Liu
authors.affiliation: School of Engineering, Brown University, Providence, RI 02912 (USA).
authors.forename: Nitin P
authors.initials: NP
authors.lastname: Padture
authors.affiliation: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101 (P.R. China). cuigl@qibebt.ac.cn.
authors.forename: Guanglei
authors.initials: G
authors.lastname: Cui
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D011211:Electric Power Supplies; D005740:Gases / Q000737:chemistry*; D008744:Methylamines / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D044367:Phase Transition; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D005740:Gases; D008744:Methylamines; D010087:Oxides; C059910:perovskite; C027451:methylamine; D014025:Titanium
keywords: defect healing; methylamine; perovskite phases; photovoltaics; thin film