High photodetector responsivity and weak light detection in a manganese doped lead-free low dimensional perovskite†

Abstract

Photodetectors are optoelectronic devices commonly used in communication and sensing systems. Currently, commercial photodetectors using silicon and other inorganic semiconductors demonstrate high performance but are expensive, require complex device manufacturing processes, and have limited sensitivity. This entails the need for the development of innovative photo-sensitive materials. In this vein, lead halide perovskites delivered competitive optoelectrical properties; however, the concerns of environmental toxicity and instability are potential barriers to practical deployment. Lead-free, environmentally benign perovskite alternatives with high responsivity and weak light detectability are advancing. We report a maximum photodetector responsivity for a bismuth-based perovskite by Mn²⁺ doping. The photodetector fabricated with a SnO₂ heterojunction also displayed reduced weak light detection as low as 49.1 nW cm⁻².