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Department of Physics

Staff profile

Publication details for Professor Stewart Clark

Xiong, K., Robertson, J. & Clark, S.J. (2006). Defect states in the high-dielectric-constant gate oxide LaAlO3. Applied Physics Letters 89(2): 022907.

Author(s) from Durham

Abstract

We present calculations of the energy levels of the oxygen vacancy,AlLa antisite, and oxygen interstitial defects in LaAlO3 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 near the LaAlO3conduction band and above the Si gap. It is identified as the main electron trap and the cause of instability. The AlLa antisite gives a state near midgap, neutral when empty, which would be an important trap, with no counterpart in HfO2.