Electron spin resonance signature of the oxygen vacancy in HfO2

Gillen, R.; Robertson, J.; Clark, S.J.

Abstract

The oxygen vacancy has been inferred to be the critical defect in HfO2, responsible for charge trapping, gate threshold voltage instability, and Fermi level pinning for high work function gates, but it has never been conclusively identified. Here, the electron spin resonance g tensor parameters of the oxygen vacancy are calculated, using methods that do not over-estimate the delocalization of the defect wave function, to be gxx = 1.918, gyy = 1.926, gzz = 1.944, and are consistent with an observed spectrum. The defect undergoes a symmetry lowering polaron distortion to be localized mainly on a single adjacent Hf ion.

Citation

Gillen, R., Robertson, J., & Clark, S. (2012). Electron spin resonance signature of the oxygen vacancy in HfO2. Applied Physics Letters, 101(10), Article 102904. https://doi.org/10.1063/1.4751110

• Journal Article Type: Article
• Acceptance Date: Aug 23, 2012
• Publication Date: Sep 3, 2012
• Deposit Date: Jun 3, 2014
• Publicly Available Date: Aug 18, 2015
• Journal: Applied Physics Letters
• Print ISSN: 0003-6951
• Electronic ISSN: 1077-3118
• Publisher: American Institute of Physics
• Peer Reviewed: Peer Reviewed
• Volume: 101
• Issue: 10
• Article Number: 102904
• DOI: https://doi.org/10.1063/1.4751110
• Public URL: https://durham-repository.worktribe.com/output/1460697