Fig. 4From: Growth of centimeter-scale perovskite single-crystalline thin film via surface engineeringCharacterization of MAPbBr3 SC-TF photodetector. a Structure of the device. The film is sandwiched in the ITO substrate and top Au electrode, forming a metal–semiconductor-metal structure. b Gain and responsivity of the device at different incident power density. The largest gain is ~ \(10^{4}\) which benefits from the high crystallinity and thin thickness of the active layer. c 3 dB bandwidth of the device is measured as 750 HzBack to article page