A reversible and fast-responsive humidity sensor based on a lead-free Cs₂TeCl₆ double perovskite

Abstract

Owing to their high conductivity and carrier mobility, the outstanding achievements of lead halide perovskites have been demonstrated in humidity sensor applications.

Multifunctional Flexible Humidity Sensor Systems Towards Noncontact Wearable Electronics

“…2 a, b). To further figure out the physical mechanism of resistive semiconductor-based humidity sensors, first principle calculations were also carried out [ 44 , 70 ]. For example, the basic mechanism of a ZnIn 2 S 4 (ZIS) humidity sensor was uncovered by density functional theory (DFT) calculation [ 44 ].…”

“…2 The working principle of flexible humidity sensor at low and high RH. ( a ) The adsorption of water molecules on the SnS 2 /RGO composite film at low and high RH [ 70 ]. Copyright 2019 Elsevier.…”

High‐Performance Humidity Sensor Based on CsPdBr3Nanocrystals for Noncontact Sensing of Hydromechanical Characteristics of Unsaturated Soil

“…[ 29 ] Pi et al used lead‐free double‐perovskite material Cs 2 TeCl 6 as the reversible and fast‐responsive humidity sensor, which had a response/recovery time of 13.8/1.39 s, and it was used for monitoring human respiration. [ 27 ] As we know, the performance of humidity sensors has a great correlation with material size, and the smaller the size of the material, the larger the surface‐to‐volume ratio, leading to the more water molecules being contacted and the better sensor performance. Although great achievement has been made in humidity sensors based on lead‐free perovskite systems, the currently reported scale of lead‐free perovskite is basically above micrometers, and there are few works on lead‐free perovskite nanocrystals (NCs) in the construction of humidity sensors as far as we know.…”

“…[22,23] Therefore, the lead-free perovskite has entered the vision of researchers due to its environmental friendliness. Meanwhile, a few kinds of the lead-free perovskite, such as Cs 2 BiAgBr 6 , Cs 2 TeCl 6 , Cs 2 PdBr 6 , and Cs 3 Cu 2 Br 5, [15,[24][25][26][27][28][29][30] have good water and oxygen stability; thus, they can work stably in the environment for a long time and have been used to prepare humidity sensors. Humidity sensors with high sensitivity and fast response play an important role in environmental, industrial, and agricultural fields for monitoring moisture content.…”

Ultrasensitive turn-on luminescence humidity sensor based on a perovskite/zeolite composite

“…8–11 MHPs have also been employed for humidity sensing but mostly based on changes in electronic properties. 12–21 Until now, luminescence moisture sensors based on MHPs are still in infancy. 14 For example, organic–inorganic MHP-based fluorescent humidity sensors not only show poor performance at low relative humidity (RH), but also degrade in moisture-rich environments.…”