Conductance Model for Single-Crystalline/Compact Metal Oxide Gas-Sensing Layers in the Nondegenerate Limit: Example of Epitaxial SnO2(101)Click to copy article linkArticle link copied!
- Cristian Eugen SimionCristian Eugen SimionNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaMore by Cristian Eugen Simion
- Federico SchipaniFederico SchipaniInstitute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, GermanyMore by Federico Schipani
- Alexandra PapadogianniAlexandra PapadogianniPaul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Hausvogteiplatz 5−7, 10117 Berlin, GermanyMore by Alexandra Papadogianni
- Adelina StanoiuAdelina StanoiuNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaMore by Adelina Stanoiu
- Melanie BuddeMelanie BuddePaul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Hausvogteiplatz 5−7, 10117 Berlin, GermanyMore by Melanie Budde
- Alexandru OpreaAlexandru OpreaInstitute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, GermanyMore by Alexandru Oprea
- Udo WeimarUdo WeimarInstitute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, GermanyMore by Udo Weimar
- Oliver BierwagenOliver BierwagenPaul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Hausvogteiplatz 5−7, 10117 Berlin, GermanyMore by Oliver Bierwagen
- Nicolae Barsan*Nicolae Barsan*E-mail: [email protected]Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, GermanyMore by Nicolae Barsan
Abstract
Semiconducting metal oxide (SMOX)-based gas sensors are indispensable for safety and health applications, for example, explosive, toxic gas alarms, controls for intake into car cabins, and monitor for industrial processes. In the past, the sensor community has been studying polycrystalline materials as sensors where the porous and random microstructure of the SMOX does not allow a separation of the phenomena involved in the sensing process. This led to conduction models that can model and predict the behavior of the overall response, but they were not capable of giving fundamental information regarding the basic mechanisms taking place. The study of epitaxial layers is a definite improvement, allowing clarifying the different aspects and contributions of the sensing mechanisms. A detailed analytical model of the transduction function for n- and p-type single-crystalline/compact metal oxide gas sensors was developed that directly relates the conductance of the sample with changes in the surface electrostatic potential. Combined dc resistance and work function measurements were used in a compact SnO2(101) layer in operando conditions that allowed us to check the validity of our model in the region where Boltzmann approximation holds to determine the surface and bulk properties of the material.
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