title: Fabrication and Characterization of High-Quality Perovskite Films with Large Crystal Grains.
abstract: Solution-processable organometal perovskite materials have been widely used in various kinds of devices. In these devices, the perovskite materials normally act as active layers. Grain boundaries and structural disorder in the perovskite layer would interfere the charge transport and increase recombination probability. Here we proposed a novel fabrication method to dramatically increase the crystal size by more than 20 times as compared with previously reported values. Exceptional structural order in the large crystals is illustrated by nanoscale surface morphology and a simple recrystallization method. Because of reduced grain boundaries and increased crystal order in perovskite layers, the lateral charge transport is significantly improved, as demonstrated by conductive atomic-force microscopy and performance of photodetectors. This deposition technology paves the way for future high-performance devices based on perovskite thin films.
authors.affiliation: Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 Japan.|CREST, Japan Science and Technology Agency (JST) , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Teng
authors.identifier: http://orcid.org/0000-0001-6514-6244
authors.initials: T
authors.lastname: Ma
authors.affiliation: School of Resources and Environmental Engineering, Wuhan University of Technology , Luoshi Road 122, Wuhan, Hubei 430070, China.
authors.forename: Qiwu
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: CREST, Japan Science and Technology Agency (JST) , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.|Graduate School of Biomedical Engineering, Tohoku University , 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Tadaki
authors.affiliation: CREST, Japan Science and Technology Agency (JST) , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.|Graduate School of Biomedical Engineering, Tohoku University , 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Ayumi
authors.initials: A
authors.lastname: Hirano-Iwata
authors.affiliation: Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 Japan.|CREST, Japan Science and Technology Agency (JST) , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Michio
authors.initials: M
authors.lastname: Niwano