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Synthesis of Cs2TeI6 thin film and its NO2 gas-sensing properties under blue-light illumination

Hoat, P.D. and Yun, Y. and Park, B. and Hung, P.T. and Hien, V.X. and Lee, J.-H. and Lee, S. and Heo, Y.-W. (2022) Synthesis of Cs2TeI6 thin film and its NO2 gas-sensing properties under blue-light illumination. Scripta Materialia, 207: 114305. ISSN 13596462

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Abstract

In this study, a thin film of Cs2TeI6 perovskite with a thickness of 1.27 mm was prepared on a glass substrate via a non-solution process. The characteristics of the material such as phase structure, morphology, optical absorption were studied. The gas-sensing properties of the Cs2TeI6-based sensor were investigated at 25 °C using various gases under illumination of a 450-nm laser. Under the blue-light illumination, the sensor exhibited good selectivity toward NO2 gas, with a very low limit of detection of 25 ppb and responsivity of 4.4% toward 1 ppm NO2. The NO2-sensing mechanism was proposed and discussed in term of a surface depletion model. The effects of light intensity, light wavelength, humidity, and long-term duration on NO2-sensing performances were further studied, showing its potential for application into NO2 gas sensors at room temperature. © 2021

Item Type: Article
Divisions: Faculties > Faculty of Physical and Chemical Engineering
Identification Number: 10.1016/j.scriptamat.2021.114305
Uncontrolled Keywords: Acetone; Chemical detection; Chemical sensors; Chemical vapor deposition; Film thickness; Gas detectors; Morphology; Nitrogen oxides; Perovskite; Tellurium compounds; Thin films; Blue light; Chemical vapor deposition methods; Gas sensing properties; Gas-sensors; Halide perovskites; Light illumination; NO2 gas sensor; Thin-films; Visible-illuminated gas sensor at room temperature; Substrates
Additional Information: Language of original document: English.
URI: http://eprints.lqdtu.edu.vn/id/eprint/8538

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