Organic-Inorganic Perovskite Halides (OIPH) have emerged as a wonder material with growing interest in sensors detecting various toxic gases. However, lead toxicity represents a potential obstacle and therefore finding lead free cost-effective compatible materials for gas sensing applications is essential. In this work, Methylammonium Bismuth Iodide i. e. (CH3NH3)3Bi2I9 (MABI) perovskite thin films-based ammonia (NH3) sensor was synthesized using antisolvent assisted one-step spin coating method. The MABI sensor shows a linear relationship between the responsivity and concentration of NH3 with excellent reversibility, high gas responsivity, and humidity stability. The MABI thin-film sensor exhibits a maximum gas response of 24%, short response/recovery time i. e. 0.14 s /8.15 s and good reversibility at 6 ppm of NH3. This work reveals that it is feasible to design high-performance gas sensors based on environmentally-friendly Bi-based perovskites.
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