Organometallic halide perovskite films were treated with novel facile solvent vapour annealing to control crystal grain size as well as the crystallinity of perovskite. As both polarity and vapour pressure of the treatment solvent for perovskite increase, luminance increases and the wavelength of the photoluminescence emission peak decreases due to enhanced crystallinity and reduced grain size.
This research was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean Government, Ministry of Science, ICT and Future Planning (MSIP) (NRF-2016R1A2B4013003, NRF-2018R1A2A3075144 and NRF-2018R1A2B6001019) and by the \\u201CResearch on Advanced Optical Science and Technology\\u201D grant funded by the Gwangju Institute of Science and Technology (GIST) in 2019.
