Plasmonic heterostructure biosensor based on perovskite/two dimensional materials

We propose a bimetallic glucose sensor based on surface plasmon using three-dimensional metal halide perovskites and two-dimensional material. The transfer matrix method and density functional theory corroborated by finite-element simulation are used for numerical analysis for the first time. In the angle interrogation method, MAPbBr3 and monolayer graphene enhanced sensitivity by 254%. A conventional Ag-based sensor has a sensitivity of 113 deg/RIU, whereas the bimetallic/ MAPbBr3/ graphene stack has a sensitivity of 400.25 deg/RIU with 22 nm Ag/ 22 nm Au/ 17 nm MAPbBr3/ graphene. Furthermore, the signal-to-noise ratio, figure of merit, and detection range of the proposed structure are 0.153 deg− 1, 61.23 RIU− 1, and 1.33–1.345, respectively. We also investigate the ductility, temperature stability, thermodynamics, and mechanical stability of metal halide perovskites in detail. The results show that compared to published results, the proposed SPR sensor has significantly improved characteristics.