Abstract
In the thin film fabrication of a typical organic–inorganic halide perovskite material, CH3NH3PbI3 (MAPbI3), by bar-coating, thermal conversion from its precursor to MAPbI3 was focused on, and an evaporation-site-controlled annealing method was proposed. The crystal grain size of MAPbI3 changed depending on the sweep speed of a cover plate set above the precursor liquid films. The crystallinity of the MAPbI3 thin film was clarified by analyzing electron backscatter diffraction. The typical inverted-type solar cells with the MAPbI3 thin films prepared by evaporation-site-controlled annealing were fabricated, and the improved performance was demonstrated in comparison with the conventional uniform annealing method.
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