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Morphology dependence of thermopower and conductance in semiconducting oxides with space charge regions

Title data

Rettig, Frank ; Moos, Ralf:
Morphology dependence of thermopower and conductance in semiconducting oxides with space charge regions.
In: Solid State Ionics. Vol. 179 (2008) Issue 39 . - pp. 2299-2307.
ISSN 0167-2738
DOI: https://doi.org/10.1016/j.ssi.2008.08.006

Official URL: Volltext

Abstract in another language

The mechanism of the gas concentration dependent conductivity of semiconducting metal oxides is often described by one-dimensional analytic models. The thermopower of materials with space charge regions is mostly not taken into account. Here, a numerical method is presented that allows to calculate the effective thermopower and effective resistance of semiconducting gas sensitive oxides with space charge regions. This involves both the numerical solution of the nonlinear Poisson–Boltzmann equation leading to a potential distribution and two potential equations for the calculation of the electrical conductivity and the thermovoltage. Varied morphological parameters were the grain sizes and the neck radii. The results were plotted in the form of Jonker diagrams and compared with homogeneous metal oxides. Intrinsic materials and slightly donor-doped materials turned out to be ideal candidates for direct thermoelectric gas sensors. First tests with Fe2O3 as an intrinsic material confirmed this assumption.

Further data

Item Type: Article in a journal
Refereed: Yes
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
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
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: 21 Jan 2015 11:35
Last Modified: 06 Apr 2016 09:11
URI: https://eref.uni-bayreuth.de/id/eprint/5721