Visible-Light-Activated Response Originating from Carrier-Mobility Modulation of NO<sub>2</sub> Gas Sensors Based on MoS<sub>2</sub> Monolayers

DOI Web Site PubMed 被引用文献4件 参考文献47件
  • Hiroshi Tabata
    Division of Electrical, Electronic and Infocommunications Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
  • Hiroaki Matsuyama
    Division of Electrical, Electronic and Infocommunications Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
  • Taishi Goto
    Division of Electrical, Electronic and Infocommunications Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
  • Osamu Kubo
    Division of Electrical, Electronic and Infocommunications Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
  • Mitsuhiro Katayama
    Division of Electrical, Electronic and Infocommunications Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

書誌事項

公開日
2021-02-02
資源種別
journal article
権利情報
  • https://doi.org/10.15223/policy-029
  • https://doi.org/10.15223/policy-037
  • https://doi.org/10.15223/policy-045
DOI
  • 10.1021/acsnano.0c06996
公開者
American Chemical Society (ACS)

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説明

Some gas sensors exhibit significant increases in their sensitivity and response/recovery rates under light illumination. This photoactivation of the gas response is considered a promising alternative to conventional thermal activation, which requires high power consumption. Thin layers of molybdenum disulfide (MoS2) are known to exhibit an effective photoactivated gas response under visible light. However, the mechanism of the photoactivated response has not yet been studied in detail. In this study, we fabricated field-effect-transistor (FET) gas sensors based on MoS2 monolayers and investigated their photoactivated gas responses to NO2 gas under illumination at various irradiances of visible light. A photocurrent was generated mainly due to the photovoltaic effect, which decreased upon exposure to NO2. The conductance-based sensor response showed a dependence on NO2 concentration according to the Langmuir adsorption isotherm, thereby suggesting that the response is proportional to the surface coverage of NO2 molecules on the MoS2 layer. The response and recovery rates showed a linear increase with increasing irradiance. Analysis based on the Langmuir adsorption model revealed that both photostimulated adsorption and desorption are involved in the photoactivated response. In contrast, despite the strong dependence of the photocurrent on the irradiance, the magnitude of the sensor response was independent of the irradiance. Based on this result and the change in transfer characteristics of the FET during NO2 exposure, we concluded that the fast response/recovery of the photoactivated response is due to the carrier mobility modulation of MoS2, which is caused by the dipole scattering of adsorbed NO2 molecules.

収録刊行物

  • ACS Nano

    ACS Nano 15 (2), 2542-2553, 2021-02-02

    American Chemical Society (ACS)

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