摘要： Organometallic perovskites have great potential for their utilization in photodetector. However, the photoresponsivity of the perovskite film is limited by the low light absorption and charge transport capability. The preparation of good quality film with higher light–harvesting capability on the substrate has been a challenging job till now. In this work, we have developed high–quality white fluorescence graphene quantum dots and CH3NH3PbI3 hybrid film by one–step solvent–induced fast deposition–crystallization technique for the photodetector applications. Various amount of graphene quantum dots is added in composites to optimize the device performance and the hybrid film results in smooth and compactly distributed crystalline grains. The hybrid film device has exhibited 2 times higher photocurrent–to–dark current ratio, three–fold improved responsivity of 12 A W-1, detectivity enhancement upto 6.5 × 1011 Jones and a faster response speed compare to that of the neat MAPbI3 at -3 V bias voltage. The graphene quantum dots addition induces efficient charge transfer and enhances the photocurrent by more than 2 times compare to the neat film. High light absorption and fast charge transport capability of the film are the primary responsible for the high performance of the photodetector.