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Piezotronic effect at Schottky barrier of a metal-ZnO single crystal interface

Keil, Peter ; Frömling, Till ; Klein, Andreas ; Rödel, Jürgen ; Novak, Nikola (2021):
Piezotronic effect at Schottky barrier of a metal-ZnO single crystal interface. (Publisher's Version)
In: Journal of Applied Physics, 121 (15), ISSN 0021-8979, e-ISSN 1089-7550,
DOI: 10.26083/tuprints-00019952,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Piezotronic effect at Schottky barrier of a metal-ZnO single crystal interface
Language: English
Abstract:

ZnO is considered as one of the most promising semiconductor materials for future applications based on the piezotronic effect. Intense studies on ZnO nanowires had been carried out to understand the modulation of the Schottky barrier height at the metal ZnO interface via piezoelectricity. However, an experimental investigation on bulk ZnO single crystals and a fundamental comparison of the modification of the barrier height determined experimentally and theoretically are still missing. Therefore, an adjustment of the electrostatic potential barrier height at metal-ZnO single crystal interfaces due to stress induced piezoelectric charges was conducted, using both O- and Zn-terminated surfaces. In-situ stress dependent impedance and current-voltage measurements were utilized to extract the electrical properties of the potential barrier and to determine the reduction of the barrier height. The decrease of the interface resistance and increase of the capacitance reveal the presence of stress induced piezoelectric charges. The experimentally evaluated reduction of the barrier height reveals a moderate change of about 9 meV at 70 MPa and supports prior work on metal-ZnO nanowires. This change was found to be in good agreement with theoretical calculations based on the imperfect screening model if a thickness of the interface layer is assumed to be ~2 Å.

Journal or Publication Title: Journal of Applied Physics
Journal volume: 121
Number: 15
Collation: 5 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 18 Nov 2021 10:43
Last Modified: 18 Nov 2021 10:43
DOI: 10.26083/tuprints-00019952
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-199523
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19952
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