Graphene-enhanced perovskite hybrid photodetectors with ultra-sensitivity and stability via inkjet printing

Metal-halide perovskites are promising materials for optoelectronic applications due to their strong light absorption, tunable bandgaps, and solution-processability. However, their use in photodetectors is often limited by low carrier mobility and degradation over time as compared to advanced 2D nano-materials. Here, we report ultrasensitive photodetectors based on inkjet-printed nanocrystalline films of mixed-phase raisin bread CsPbBr3/Cs4PbBr6 perovskite integrated on graphene platforms. The combination of a photoconductive mixed-phase perovskite and a high-mobility 2D graphene channel enables efficient photogating and broadband charge transport. This device architecture achieves exceptional performance with responsivities surpassing 5.7 × 104 A W-1 and detectivities exceeding 1016 Jones at 312 nm. The enhanced performance arises from the synergistic interplay between charge confinement in the perovskite domains and ultrafast carrier extraction by graphene. Moreover, the fabricated photodetectors exhibit remarkable operational stability, a longevity primarily attributed to the unique composite raisin-bread architecture of the inkjet-printed perovskite films. This work offers a scalable and sustainable strategy for high-performance broadband photodetection. Low carrier mobility and degradation over time are key challenges to address in metal-halide perovskite photodetectors. Here, ultrasensitive photodetectors are reported based on inkjet-printed nanocrystalline films of a mixed-phase raisin bread halide perovskite, integrated on a graphene platform.