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APPLIED PHYSICS LETTERS
Volume 92, Issue 19, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.2926655
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From scanning tunneling microscopy, we present unambiguous evidence of thermally induced localized conduction paths exhibiting an asymmetrical conduction property in the high-kappa gate stack. The tunneling current under gate injection biasing is found to be much larger than that under substrate injection biasing after a 700 degrees C postdeposition anneal, i.e., the localized paths exhibit a much lower resistance under gate injection biasing. This finding provides a phenomenological explanation for the polarity dependent breakdown of the high-kappa gate stack as observed from electrical stressing of large-area metal-oxide-semiconductor capacitors. (c) 2008 American Institute of Physics.
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