Enhanced Crystallinity and Performance of CH3NH3PbI3 Thin Film Prepared by Controlling Hot CH3NH3I Solution Onto Evaporated PbI2 Nanocrystal

In this paper, a facile, efficient, and reduplicative modified two-step sequential method for the fabrication of CH
₃
NH
₃
PbI
₃
thin film was reported. First, a uniform, homogeneous, and small-sized PbI
₂
nanocrystal was deposited via vapor evaporation. Then, a hot CH
₃
NH
₃
I solution with a different temperature was spin coated onto the prepared PbI
₂
thin film to form perovskite thin films in a short time. The results demonstrated that homogeneous, compact, complete surface coverage, high crystallinity, and pinhole-free CH
₃
NH
₃
PbI
₃
thin film was prepared by CH
₃
NH
₃
I solution with 80°C spin coating on the evaporated PbI
₂
nanocrystal.