Thickness control and photovoltaic properties of CH ₃ NH ₃ PbI ₃ bar-coated thin film

Abstract

Abstract Thin films of a typical organic–inorganic halide perovskite material, CH 3 NH 3 PbI 3 (MAPbI 3 ), were fabricated by a bar-coating method, which is one of the candidate techniques for large-scale production. The film thickness of MAPbI 3 markedly changed depending on the sweep speed of the coating bar, that is, it decreased in evaporation regime under the low-speed condition, and increased in the Landau–Levich regime under the high-speed condition. The typical inverted-type p-i-n planar solar cells with the MAPbI 3 thin films demonstrated the photoelectric conversion efficiency of 14.0%, and their photovoltaic properties depending on the sweep speed were discussed by taking the surface morphology and crystallinity into consideration.