Room-temperature sensing of NH3 gas using CsPbBr3 thin films grown via dual-source evaporation

An effective ammonia sensor was developed using a CsPbBr3 thin film prepared directly by dual-source thermal evaporation. The CsPbBr3-based sensor exhibited good selectivity toward ammonia gas at room temperature, showing a high responsivity (958% at 10 ppm) and low detection limit (250 ppb). The sensor also demonstrated good reversibility, repeatability and fast rise/recovery times (12/16 s). Additionally, the effect of humidity on ammonia responsivity was investigated for the application of CsPbBr3 films in practical room-temperature ammonia gas sensors. The ammonia-sensing mechanism of the CsPbBr3 film was proposed and discussed.& COPY; 2023 Elsevier B.V. All rights reserved.

Automated summary

An effective ammonia sensor was developed using a CsPbBr3 thin film prepared directly by dual-source thermal evaporation. The sensor exhibited good selectivity toward ammonia gas at room temperature, with high responsivity (958% at 10 ppm) and low detection limit (250 ppb). It also showed good reversibility, repeatability, and fast response/recovery times (12/16 s). The effect of humidity on the sensor's performance was investigated, and the ammonia-sensing mechanism of the CsPbBr3 film was proposed and discussed.