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Bulk ZnO as piezotronic pressure sensor

Baraki, Raschid and Novak, Nikola and Frömling, Till and Granzow, Torsten and Rödel, Jürgen (2014):
Bulk ZnO as piezotronic pressure sensor.
In: Applied Physics Letters, pp. 111604(1-4), 105, (11), ISSN 0003-6951, [Online-Edition: http://dx.doi.org/10.1063/1.4895941],
[Article]

Abstract

The impact of uniaxial compressive mechanical stress on the electrical properties of a ZnO varistor ceramic was studied with respect to a potential use in pressure sensor applications. Current-voltage measurements as a function of temperature are strongly affected by the applied stress. The modulation of charge transport properties with uniaxial stress causes large changes in resistance. Hence, a gauge factor of ∼800 is attained, which significantly exceeds the value of conventional sensors. The effect is attributed to the piezotronic effect, i.e., the altering of the potential barrier at grain boundaries due to the piezoelectricity of ZnO. This change in grain boundary potential barriers via mechanical deformation represents a promising physical concept for the development of better materials for sensor applications.

Item Type: Article
Erschienen: 2014
Creators: Baraki, Raschid and Novak, Nikola and Frömling, Till and Granzow, Torsten and Rödel, Jürgen
Title: Bulk ZnO as piezotronic pressure sensor
Language: English
Abstract:

The impact of uniaxial compressive mechanical stress on the electrical properties of a ZnO varistor ceramic was studied with respect to a potential use in pressure sensor applications. Current-voltage measurements as a function of temperature are strongly affected by the applied stress. The modulation of charge transport properties with uniaxial stress causes large changes in resistance. Hence, a gauge factor of ∼800 is attained, which significantly exceeds the value of conventional sensors. The effect is attributed to the piezotronic effect, i.e., the altering of the potential barrier at grain boundaries due to the piezoelectricity of ZnO. This change in grain boundary potential barriers via mechanical deformation represents a promising physical concept for the development of better materials for sensor applications.

Journal or Publication Title: Applied Physics Letters
Volume: 105
Number: 11
Uncontrolled Keywords: Electrical resistivity; Zinc oxide films; Varistors; Grain boundaries; Piezoelectric fields
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 Sep 2014 07:35
Official URL: http://dx.doi.org/10.1063/1.4895941
Identification Number: doi:10.1063/1.4895941
Funders: Deutsche Forschungsgemeinschaft (DFG) under the Project No. RO954/23
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