title: Planar heterojunction perovskite solar cells via vapor-assisted solution process.
abstract: Hybrid organic/inorganic perovskites (e.g., CH3NH3PbI3) as light absorbers are promising players in the field of third-generation photovoltaics. Here we demonstrate a low-temperature vapor-assisted solution process to construct polycrystalline perovskite thin films with full surface coverage, small surface roughness, and grain size up to microscale. Solar cells based on the as-prepared films achieve high power conversion efficiency of 12.1%, so far the highest efficiency based on CH3NH3PbI3 with the planar heterojunction configuration. This method provides a simple approach to perovskite film preparation and paves the way for high reproducibility of films and devices. The underlying kinetic and thermodynamic parameters regarding the perovskite film growth are discussed as well.
authors.affiliation: Department of Materials Science and Engineering and ‡California NanoSystems Institute, University of California , Los Angeles, California 90095, United States.
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
authors.forename: Huanping
authors.initials: H
authors.lastname: Zhou
authors.forename: Ziruo
authors.initials: Z
authors.lastname: Hong
authors.forename: Song
authors.initials: S
authors.lastname: Luo
authors.forename: Hsin-Sheng
authors.initials: HS
authors.lastname: Duan
authors.forename: Hsin-Hua
authors.initials: HH
authors.lastname: Wang
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Liu
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang