Novel organometal halide perovskites for room temperature NO₂ gas sensor

Organometal halide perovskites (OHPs) have been extensively applied as promising semiconductor materials with tunable bandgap for optoelectronic devices recently. Owing to attractive characteristics of high carrier mobility and surface-volume ratio, they have potential to be an ideal candidate for next-generation gas sensors. Hence, we report the CH 3 NH 3 PbI 3 -based gas sensors fabricated using a one-step spin-coating method for nitrogen dioxide (NO 2 ) detection. The prepared sensor demonstrates stable performances with a sensing response of 26.2% and response time of 70s to 10 ppm NO 2 at room temperature. It exhibits obvious response to NO 2 at a low concentration of 2 ppm. The possible mechanism for gas absorption/desorption on perovskite films is also investigated. Our findings highlight the promising potential of the CH 3 NH 3 PbI 3 -based gas sensors, OHPs may be a novel active material for room temperature gas sensing applications.