Fast Lead-Free Humidity Sensor Based on Hybrid Halide Perovskite

Crystals

Milica Vasiljević¹  Dragan Damjanović¹  Pavao Andričević²  Alla Arakcheeva²  Márton Kollár²  László Forró²  Trpimir Ivšić²  Veljko Djokić²  Endre Horváth²  Anastasiia Ciers² 

[1] Group for Ferroelectrics and Functional Oxides, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland;Laboratory of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland;

关键词: lead-free;    perovskite;    environmentally friendly;    humidity sensor;    fast response;   

DOI  :  10.3390/cryst12040547

来源: DOAJ

【 摘 要 】

An environmentally friendly analog of the prominent methylammonium lead halide perovskite, methylammonium bismuth bromide (MA₃Bi₂Br₉), 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 MA₃Bi₂Br₉ 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).

【 授权许可】

Unknown