Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 13, Pages 2319-2321Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1688453
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The Ge/HfO2 interface band diagram was directly determined using internal photoemission of electrons and holes from Ge into the Hf oxide. The inferred offsets of the conduction and valence band at the interface, 2.0 +/- 0.1 and 3.0 +/- 0.1 eV; respectively, suggest the possibility to apply the deposited HfO2 as an insulator on Ge. The post-deposition annealing of the Ge/HfO2 structures in oxygen results in similar to1 eV reduction of the valence band offset attributed to the growth of GeO2 interlayer. (C) 2004 American Institute of Physics.
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