The flat band potentials and carrier densities of spin coated and sprayed MAPbI, FACsPbI, and MAPbBr perovskite films were determined using the Mott-Schottky relation. The films developed a space charge layer and exhibited p-type conduction with a carrier concentration of ∼10 cm for spin coated films. Electrochemical impedance spectra showed typical space charge impedance at frequencies >1 kHz, and an exceptional high capacitance at frequency <1 kHz owing to an ion diffusion component.
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