Perovskite-based p-n type heterojunction decorated with reduced graphene oxide for improved liquified petroleum gas sensing

Abstract

In both home and business settings, effective LPG detection is essential for preserving security and averting possible risks. This work explores the impact of reduced graphene oxide (rGO) ornamentation on chemi-resistive LPG sensing using MAPbI₃ halide-perovskite, which is manufactured via a straightforward co-precipitation technique. Because of its strong surface reactivity and semiconducting characteristics, MAPbI₃ is essential to LPG sensing. When r-GO is used to decorate MAPbI₃, a p-n heterojunction is created, which greatly improves charge carrier migration and separation and improves junction performance. When subjected to 500 ppm LPG, the MAPbI₃@0.2 rGO heterojunction showed a remarkable response of 83 % compared to the pristine MAPbI₃ at 120 °C. It also had a reduced response time of 46 s and a recovery time of less than 500 s. The increased specific surface area of rGO, which results in more active sites for LPG molecule adsorption and less charge transfer resistance, is thought to be responsible for this improved performance. Amazingly, the material performed consistently over several cycles and maintained its sensitivity at 80 °C. The sensor has potential for use in commercial applications because of its great sensitivity and stability at low temperatures. The efficiency of MAPbI₃@rGO p-n heterojunction as dependable LPG sensors is highlighted by this work, providing notable increases in safety in a variety of settings.