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Article: Hydrogen sensors based on TFTs with catalytic source/drain electrodes: IGZO versus pentacene

TitleHydrogen sensors based on TFTs with catalytic source/drain electrodes: IGZO versus pentacene
Authors
KeywordsElectrodes
Electrodes
Hydrogen
Pentacene
Organic thin film transistors
Issue Date2018
PublisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=55
Citation
IEEE Electron Device Letters, 2018, v. 39 n. 10, p. 1596-1599 How to Cite?
AbstractA novel H2 sensor based on an InGaZnO thin-film transistor (IGZO TFT) with Pd source/drain electrodes as sensing medium is fabricated. Without the need of heating, rapid and concentration-dependent response (in the form of drain-current increase) of the sensor is observed under various cycles of H2 exposure/evacuation with H2 concentration ranging from 200 to 15 000 ppm. The drain-current increase is due to a decrease in barrier height at the interface between the Pd source and IGZO channel induced by the formation of a hydrogen dipole layer at the interface. By comparing this sensor with its counterpart based on pentacene OTFT having an opposite response, it can be claimed that the same hydrogen dipole layer has opposite effect on the two TFTs: it creates an electric field that can assist the flow of electrons from the source electrode to the IGZO channel, but oppose the flow of holes from the source electrode to the pentacene channel. As a result, the IGZO TFT can work in an OFF-to- ON mode during sensing, and so the standby power of sensing circuit could be reduced. Although the OTFT sensor shows higher sensitivity and faster response due to the higher flexibility of the pentacene layer, the proposed sensor has a better stability at high temperature due to the larger bandgap of IGZO and so is suitable for hydrogen-sensing applications in a wider range of operating temperature.
Persistent Identifierhttp://hdl.handle.net/10722/278164
ISSN
2019 Impact Factor: 4.221
2015 SCImago Journal Rankings: 1.791

 

DC FieldValueLanguage
dc.contributor.authorLI, B-
dc.contributor.authorLai, PT-
dc.contributor.authorTANG, WM-
dc.date.accessioned2019-10-04T08:08:43Z-
dc.date.available2019-10-04T08:08:43Z-
dc.date.issued2018-
dc.identifier.citationIEEE Electron Device Letters, 2018, v. 39 n. 10, p. 1596-1599-
dc.identifier.issn0741-3106-
dc.identifier.urihttp://hdl.handle.net/10722/278164-
dc.description.abstractA novel H2 sensor based on an InGaZnO thin-film transistor (IGZO TFT) with Pd source/drain electrodes as sensing medium is fabricated. Without the need of heating, rapid and concentration-dependent response (in the form of drain-current increase) of the sensor is observed under various cycles of H2 exposure/evacuation with H2 concentration ranging from 200 to 15 000 ppm. The drain-current increase is due to a decrease in barrier height at the interface between the Pd source and IGZO channel induced by the formation of a hydrogen dipole layer at the interface. By comparing this sensor with its counterpart based on pentacene OTFT having an opposite response, it can be claimed that the same hydrogen dipole layer has opposite effect on the two TFTs: it creates an electric field that can assist the flow of electrons from the source electrode to the IGZO channel, but oppose the flow of holes from the source electrode to the pentacene channel. As a result, the IGZO TFT can work in an OFF-to- ON mode during sensing, and so the standby power of sensing circuit could be reduced. Although the OTFT sensor shows higher sensitivity and faster response due to the higher flexibility of the pentacene layer, the proposed sensor has a better stability at high temperature due to the larger bandgap of IGZO and so is suitable for hydrogen-sensing applications in a wider range of operating temperature.-
dc.languageeng-
dc.publisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=55-
dc.relation.ispartofIEEE Electron Device Letters-
dc.rightsIEEE Electron Device Letters. Copyright © IEEE.-
dc.rights©20xx IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.-
dc.subjectElectrodes-
dc.subjectElectrodes-
dc.subjectHydrogen-
dc.subjectPentacene-
dc.subjectOrganic thin film transistors-
dc.titleHydrogen sensors based on TFTs with catalytic source/drain electrodes: IGZO versus pentacene-
dc.typeArticle-
dc.identifier.emailLai, PT: laip@eee.hku.hk-
dc.identifier.authorityLai, PT=rp00130-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1109/LED.2018.2865743-
dc.identifier.scopuseid_2-s2.0-85051818851-
dc.identifier.hkuros306905-
dc.identifier.volume39-
dc.identifier.issue10-
dc.identifier.spage1596-
dc.identifier.epage1599-
dc.publisher.placeUnited States-

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