Fast Lead-Free Humidity Sensor Based on Hybrid Halide Perovskite

Veljko Djokic; Pavao Andricevic; Marton Kollar; Anastasiia Ciers; Alla Arakcheeva; Milica Vasiljevic; Dragan Damjanovic; Laszlo Forro; Endre Horvath; Trpimir Ivsic

doi:10.3390/cryst12040547

Fast Lead-Free Humidity Sensor Based on Hybrid Halide Perovskite
Journal article, 2022

An environmentally friendly analog of the prominent methylammonium lead halide perovskite, methylammonium bismuth bromide (MA(3)Bi(2)Br(9)), was prepared and investigated in the form of powder, single crystals and nanowires. Complete characterization via synchrotron X-ray diffraction data showed that the bulk crystal does not incorporate water into the structure. At the same time, water is absorbed on the surface of the crystal, and this modification leads to the changes in the resistivity of the material, thus making MA(3)Bi(2)Br(9) an excellent candidate for use as a humidity sensor. The novel sensor was prepared from powder-pressed pellets with attached carbon electrodes and was characterized by being able to detect relative humidity over the full range (0.7-96% RH) at ambient temperature. Compared to commercial and literature values, the response and recovery times are very fast (down to 1.5 s/1.5 s).

fast response

humidity sensor

lead-free

perovskite

environmentally friendly