In this paper, the performance of photodetectors based on CH3NH3PbBr3 organic‐inorganic hybrid was evaluated, given their wide applications in different industries. This structure an appropriate for the active layer of photodetector device. Impressive results are concluded by changing the halogen atom and the energy gap of the hybrid structures. The obtained results reveal that the investigation of the appropriate organic cation and suitable halogen atom, as well as the concentration of the hybrids in the photodetectors, are necessary to find a suitable condition for an effective photodetectors. Exciting results are achieved by considering the Current-voltage (I-V) curves of darkness and light. The I-V curve with 1.8 wt. % concentration of CH3NH3PbBr3 organic‐inorganic hybrid shows the Isc of 1 μA and response of 0.027 μA/W. The device with 1.2 wt. % concentration showed Isc of 0.25 μA and response of 0.006 μA/W. Perovskites are optically configurable so that they acquire proper band gaps with high slope absorption edge and considerable efficiencies in collecting the charges produced by the light.