title: Controlled reaction for improved CH3NH3PbI3 transition in perovskite solar cells.
abstract: Hybrid halide perovskites represent one of the most promising solutions toward the fabrication of all solid nanostructured solar cells, with improved efficiency and long-term stability. This article aims at investigating the properties of CH3NH3PbI3 with controlled loading time in CH3NH3I solution via a two-step sequential deposition and correlating them with their photovoltaic performances. It is found that the optimum PCE of the loading time in the CH3NH3I solution is possible only at a relatively short time (10 min). Prolonging the loading time will degrade the perovskite film, and deteriorate the device performance by introducing a large amount of excessive defects and recombination. However, even if the material band gap remains substantially unchanged, a suitable loading time can dramatically improve the charge transport within the perovskite layer, exhibiting the out-standing performances of meso-superstructured solar cells.
authors.affiliation: School of Materials Science and Engineering, Shijiazhuang Tiedao University, 17 Northeast, Second Inner Ring, Shijiazhuang, 050043, China. jinjinzhao2012@163.com.
authors.forename: J J
authors.initials: JJ
authors.lastname: Zhao
authors.forename: P
authors.initials: P
authors.lastname: Wang
authors.forename: Z H
authors.initials: ZH
authors.lastname: Liu
authors.forename: L Y
authors.initials: LY
authors.lastname: Wei
authors.forename: Z
authors.initials: Z
authors.lastname: Yang
authors.forename: H R
authors.initials: HR
authors.lastname: Chen
authors.forename: X Q
authors.initials: XQ
authors.lastname: Fang
authors.forename: X L
authors.initials: XL
authors.lastname: Liu
authors.forename: Y H
authors.initials: YH
authors.lastname: Mai