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First-principles study of migration mechanisms and diffusion of oxygen in zinc oxide

Erhart, Paul and Albe, Karsten :
First-principles study of migration mechanisms and diffusion of oxygen in zinc oxide.
[Online-Edition: http://dx.doi.org/10.1103/PhysRevB.73.115207]
In: Physical Review B, 73 (11) pp. 115207-1. ISSN 1098-0121
[Article] , (2006)
Note:

SFB 595 C2

Official URL: http://dx.doi.org/10.1103/PhysRevB.73.115207

Abstract

We have performed density-functional theory calculations in conjunction with the climbing image nudged elastic band method in order to study the self-diffusion of oxygen in zinc oxide. To this end, we have derived the complete set of migration paths for vacancies as well as interstitials in wurtzite crystals and deduced expressions which provide the link to experimentally accessible tracer diffusion coefficients. The calculated migration barriers are consistent with annealing experiments on irradiated samples. We find that vacancy and interstitialcy mechanisms dominate under zinc and oxygen-rich conditions, respectively. This refutes the belief that vacancy mechanisms can be operational in experiments in oxygen-rich atmosphere. Our results provide the basis for the (re-)interpretation of diffusion experiments, and pave the way towards the development of reliable continuum models for device simulation.

Item Type: Article
Erschienen: 2006
Creators: Erhart, Paul and Albe, Karsten
Title: First-principles study of migration mechanisms and diffusion of oxygen in zinc oxide
Language: English
Abstract:

We have performed density-functional theory calculations in conjunction with the climbing image nudged elastic band method in order to study the self-diffusion of oxygen in zinc oxide. To this end, we have derived the complete set of migration paths for vacancies as well as interstitials in wurtzite crystals and deduced expressions which provide the link to experimentally accessible tracer diffusion coefficients. The calculated migration barriers are consistent with annealing experiments on irradiated samples. We find that vacancy and interstitialcy mechanisms dominate under zinc and oxygen-rich conditions, respectively. This refutes the belief that vacancy mechanisms can be operational in experiments in oxygen-rich atmosphere. Our results provide the basis for the (re-)interpretation of diffusion experiments, and pave the way towards the development of reliable continuum models for device simulation.

Journal or Publication Title: Physical Review B
Volume: 73
Number: 11
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > C - Modelling
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > C - Modelling > Subproject C2: Atomistic computer simulations of defects and their mobility in metal oxides
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 16 Aug 2011 13:30
Official URL: http://dx.doi.org/10.1103/PhysRevB.73.115207
Additional Information:

SFB 595 C2

Identification Number: doi:10.1103/PhysRevB.73.115207
Funders: This project was funded by the Sonderforschungsbereich 595 “Fatigue in functional materials” of the Deutsche Forschungsgemeinschaft., We also acknowledge financial support through a bilateral travel program funded by the German foreign exchange server �DAAD�.
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