Ferroelectric supplies are widely known for his or her capability to generate photovoltaic voltages bigger than their bandgap, making them ultimate candidates for photodetector purposes. Right here, we report a self-powered UV photodetector based mostly on a Bi0.5Na0.5TiO3 (BNT) skinny movie ready by the sol–gel methodology. In contrast with standard photodetectors based mostly on a single detection indicator, the demonstrated photodetector realizes UV gentle depth detection over a large linear vary utilizing a present and voltage twin indicator detection methodology. When the UV gentle depth is decrease than 1.8 mW cm−2, the voltage can be utilized to detect the sunshine sign. Conversely, the present could be utilized to detect the sign. This methodology not solely broadens the linear detection vary of UV gentle depth, making it potential to detect weak UV gentle of 45.2 nW cm−2, but in addition permits the detector to keep up comparatively excessive sensitivity inside the detectable vary. To analyze the distribution of spatial UV gentle depth, a self-powered photodetector array system has been utilized to document the output voltage alerts as a map.