Space limited growth of MAPbBr ₃ -Si heterojunction narrowband photodetector

Abstract

Abstract Perovskite single crystals (SC) have emerged as promising materials for photodetectors because of their exceptional photoelectric properties and long-term stability. However, the fragility of perovskite SCs and the challenges in device miniaturization hinder their practical application. In this work, methylammonium lead bromide CH 3 NH 3 PbBr 3 (MAPbBr 3 ) SC of ∼ 200 μm was successfully grown on the n -Si substrate via a space limited method on to form a MAPbBr 3 /Si heterojunction. The device not only exhibits the rectification characteristic of heterojunction but also greatly enhances capabilities in photogenerated carrier collection and conversion. Under 1.5 μW cm −2 light illumination intensity at a 10 V bias, the device achieves a responsivity of 0.16 A W −1 and a specific detectivity of 2.4 × 10 12 Jones. Furthermore, the device demonstrates light self-filtering characteristics and enables narrowband detection in the specific wavelength range of 530 nm ∼ 550 nm. The device also shows robust operational stability, retaining ∼90% of its initial photocurrent after 60 days in the air environment. This work provides a novel strategy for developing high-performance, stable narrowband photodetectors.