A review on In2O3 nanostructures for gas sensing applications

Shah, Sufaid; Hussain, Shahid; Din, Syed Taj Ud; Shahid, Arslan; Amu-Darko, Jesse Nii Okai; Wang, Mingsong; Tianyan, You; Liu, Guiwu; Qiao, Guanjun

doi:10.1016/j.jece.2024.112538

Cited by 11 publications

(1 citation statement)

References 135 publications

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“…Although many oxide semiconductors for TFTs have been developed, In 2 O 3 -based materials whose electrical properties change depending on the surrounding atmosphere are suitable for the active channel of such TFT sensors [18,19], and actual sensing of gases such as NO x and H 2 has been reported [20][21][22]. Recently, review papers on In 2 O 3 transistorbased gas sensors have been published overviewing their history, working principles, synthesis, and future applications [23,24]. Paghi et al summarized a gas sensor based on an In 2 O 3 nanowire field-effect transistor, which can serve a large reaction surface compared to a flat and smooth semiconductor device.…”

Section: Introductionmentioning

confidence: 99%

Correlation between CO2 Sensitivity and Channel-Layer Thickness in In2O3 Thin-Film Transistor Gas Sensors

Nodera,

Kobayashi,

Kobayashi

et al. 2024

Electronics

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CO2 monitoring is important for achieving net-zero emissions. Here, we report on a CO2 gas sensor based on an In2O3 thin-film transistor (TFT), which is expected to realize both low-temperature operation and high sensitivity. The effect of channel thickness on TFT performance is well known; however, its effect on CO2 sensitivity has not been fully investigated. We fabricated In2O3 TFTs of various thicknesses to evaluate the effect of channel thickness on CO2 sensitivity. Consequently, TFT gas sensors with thinner channels exhibited higher CO2 sensitivity. This is because the surface effect is more prominent for a thinner film, suggesting that charge transfer between gas molecules and the channel surface through gas adsorption has a significant impact on changes in the TFT parameters in the subthreshold region. The results showed that the In2O3 TFT in thin channels is a promising candidate for CO2-sensitive TFT gas sensors and is useful for understanding an effect of gas adsorption in oxide TFTs with a very thin channel as well.

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