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

Phung Dinh Hoat; Yeonghun Yun; Byung Jin Park; Pham Tien Hung; Vu Xuan Hien; Joon Hyung Lee; Sangwook Lee; Young Woo Heo

doi:10.1016/j.scriptamat.2021.114305

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

Phung Dinh Hoat, Yeonghun Yun, Byung Jin Park, Pham Tien Hung, Vu Xuan Hien, Joon Hyung Lee, Sangwook Lee, Young Woo Heo

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17 Scopus citations

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.

Original language	English
Article number	114305
Journal	Scripta Materialia
Volume	207
DOIs	https://doi.org/10.1016/j.scriptamat.2021.114305
State	Published - 15 Jan 2022

Keywords

Chemical vapor deposition (CVD) method
CsTeI
Halide perovskite
NO gas sensor
Visible-illuminated gas sensor at room temperature (RT)

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10.1016/j.scriptamat.2021.114305

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@article{62bbb37e12a440fbb6c2399936268dfb,

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

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.",

keywords = "Chemical vapor deposition (CVD) method, CsTeI, Halide perovskite, NO gas sensor, Visible-illuminated gas sensor at room temperature (RT)",

author = "Hoat, {Phung Dinh} and Yeonghun Yun and Park, {Byung Jin} and Hung, {Pham Tien} and Hien, {Vu Xuan} and Lee, {Joon Hyung} and Sangwook Lee and Heo, {Young Woo}",

note = "Publisher Copyright: {\textcopyright} 2021",

year = "2022",

month = jan,

day = "15",

doi = "10.1016/j.scriptamat.2021.114305",

language = "English",

volume = "207",

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T1 - Synthesis of Cs2TeI6 thin film and its NO2 gas-sensing properties under blue-light illumination

AU - Hoat, Phung Dinh

AU - Yun, Yeonghun

AU - Park, Byung Jin

AU - Hung, Pham Tien

AU - Hien, Vu Xuan

AU - Lee, Joon Hyung

AU - Lee, Sangwook

AU - Heo, Young Woo

PY - 2022/1/15

Y1 - 2022/1/15

N2 - 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.

AB - 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.

KW - Chemical vapor deposition (CVD) method

KW - CsTeI

KW - Halide perovskite

KW - NO gas sensor

KW - Visible-illuminated gas sensor at room temperature (RT)

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U2 - 10.1016/j.scriptamat.2021.114305

DO - 10.1016/j.scriptamat.2021.114305

M3 - Article

AN - SCOPUS:85115772543

SN - 1359-6462

VL - 207

JO - Scripta Materialia

JF - Scripta Materialia

M1 - 114305

ER -

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

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