fabricated by a fully ultrasonic spray pyrolysis (USP) method. The MASnBr 3 thin films had
very large grains (clusters) up to 15 μm. The crystal/crystallite size of the films was
determined from the XRD pattern as 112.7 nm. The coating of MASnBr 3 and P3HT layers
was carried out on a large area of 36 cm 2. The champion cell with an active area of 0.30 cm
2 has an open circuit voltage of 0.370 V, a short circuit of 0.460 mA/cm 2, a fill factor of …