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Semiconducting direct thermoelectric gas sensors

Title data

Rettig, Frank ; Moos, Ralf:
Semiconducting direct thermoelectric gas sensors.
In: Jaaniso, Raivo ; Tan, Ooi Kiang (ed.): Semiconductor gas sensors. 2nd Edition. - Cambridge, UK : Woodhead Publishing , 2020 . - pp. 347-384
ISBN 978-0-08-102559-8

Abstract in another language

This chapter deals with semiconducting direct thermoelectric gas sensors (DTEGs) based on oxide materials. The principle of the sensor is based on a direct measurement of the position of the Fermi level, which can be strongly dependent on the concentration of an analyte in the ambience. The DTEG principle measures a path-independent quantity—the thermovoltage. This makes the sensors extremely resistant to damage stemming from abrasives in gas streams. This chapter shows the importance of developing an adequate transducer and includes a careful analysis of the sensor signals obtained. From a technological point of view, an integration of an equipotential layer for better signal quality will appear to be necessary. Considerable effort is spent on the thermal design of the transducers using finite element method (FEM) modeling. The gas sensitive material itself is analyzed by an FEM model in terms of semiconductor equations combined with thermoelectric equations. The R&D efforts described culminate in a transfer to real-world sensors, which is reported in the final section. The DTEGs manufactured show a fast response and are stable and reproducible. DTEGs can be an alternative to the commonly used resistive or conductometric gas sensors.

Further data

Item Type: Article in a book
Refereed: Yes
Keywords: Gas sensor; Simulation; Thermoelectric; Thermopower; Tin oxide
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 09 Feb 2021 07:40
Last Modified: 09 Feb 2021 07:40