Structure and characteristics of fabricated MAPI photodetectors. (a) Schematic illustration of the photodetector. (b) Optical image of the MAPI photodetector upon e-beam irradiation (marked with dashed line box). Inset is the original photodetector. (c) I-V characteristics of MAPI0, MAPI1-1, MAPI5-1, MAPI2-2, MAPI6-4, and MAPI9-9 with 0.5 mW/cm2 halogen light illumination. (d, e) SEM image and corresponding magnified image of MAPI5-1.