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Durham University

Department of Physics

Staff profile

Publication details for Professor Stewart Clark

Xiong, K., Robertson, J., Gibson, M.C. & Clark, S.J. (2005). Defect energy levels in HfO2 high-dielectric-constant gate oxide. Applied Physics Letters 87(18): 183505.

Author(s) from Durham


This letter presents calculations of the energy levels of the oxygen vacancy and oxygen interstitial defects in HfO2 using density functional methods that do not need an empirical band gap correction. The levels are aligned to those of the Si channel using the known band offsets. The oxygen vacancy gives an energy level nearer the HfO2conduction band and just above the Si gap, depending on its charge state. It is identified as the main electron trap in HfO2. The oxygen interstitial gives levels just above the oxide valence band.