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Perovskite‐Induced Ultrasensitive and Highly Stable Humidity Sensor Systems Prepared by Aerosol Deposition at Room Temperature
Author(s) -
Cho MyungYeon,
Kim Sunghoon,
Kim IkSoo,
Kim EunSeong,
Wang ZhiJi,
Kim NamYoung,
Kim SangWook,
Oh JongMin
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201907449
Subject(s) - materials science , relative humidity , humidity , nanocomposite , perovskite (structure) , fabrication , nanotechnology , deposition (geology) , capacitive sensing , hysteresis , chemical engineering , halide , porosity , optoelectronics , composite material , inorganic chemistry , electrical engineering , paleontology , physics , sediment , biology , engineering , medicine , chemistry , alternative medicine , pathology , quantum mechanics , thermodynamics
A new capacitive‐type humidity sensor is proposed using novel materials and fabrication process for practical applications in sensitive environments and cost‐effective functional devices that require ultrasensing performances. Metal halide perovskites (CsPbBr 3 and CsPb 2 Br 5 ) combined with diverse ceramics (Al 2 O 3 , TiO 2 , and BaTiO 3 ) are selected as sensing materials for the first time, and nanocomposite powders are deposited by aerosol deposition (AD) process. A state‐of‐the‐art CsPb 2 Br 5 /BaTiO 3 nanocomposite humidity sensor prepared by AD process exhibits a significant increase in humidity sensing compared with CsPbBr 3 /Al 2 O 3 and CsPbBr 3 /TiO 2 sensors. An outstanding humidity sensitivity (21426 pF RH% −1 ) with superior linearity (0.991), fast response/recovery time (5 s), low hysteresis of 1.7%, and excellent stability in a wide range of relative humidity is obtained owing to a highly porous structure, effective charge separation, and water‐resistant characteristics of CsPb 2 Br 5 . Notably, this unprecedented result is obtained via a simple one‐step AD process within a few minutes at room temperature without any auxiliary treatment. The synergetic combination of AD technique and perovskite‐based nanocomposite can be potentially applied toward the development of multifunctional sensing devices.