Sensitive Photodetector Based on Organic Inorganic Two-Dimentional Perovskite/Silicon Hybrid Heterostructure

Abstract

Since the last decade, organic-inorganic hybrid halide perovskites (OIHPs) have been promising materials due to their extraordinary properties for a wide variety of optical applications. Herein, 2D Ruddlesden-Popper $\text{BA}_{2}\text{MAPb}_{2}\mathrm{I}_{7}$ perovskite was synthesized using a two-step solution process. $\text{BA}_{2}\text{MAPb}_{2}\mathrm{I}_{7}/\text{Si}$ heterojunction was prepared by a one-step spin-coating method onto a p-type silicon substrate. XRD, absorption, and photoluminescence analyses characterized perovskite. The photoelectric properties of the detector were studied by conducting current-voltage (I-V) and current-time (I-T) measurements with and without illumination. The above photodetector showed the highest 90mA/W Responsivity along with $1.87\times 10^{10}$ Jones detectivity. This work can promote further investigations into next-generation integrated photodetectors by direct integration of perovskite/silicon heterojunction.