Band alignment of atomic layer deposited HfO2 on clean and N passivated germanium surfaces

Hard x-ray photoelectron spectroscopy has been used to study the band alignment between atomic layer deposited HfO2 on clean Ge (100) and nitrogen treated Ge (100) surfaces. The position of the valence-band maximum was determined by convolving theoretically calculated density of states from first-pr...

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Veröffentlicht in:Applied physics letters 2010-12, Vol.97 (24)
Hauptverfasser: Rumaiz, Abdul K., Woicik, J. C., Carini, G. A., Siddons, D. P., Cockayne, E., Huey, E., Lysaght, P. S., Fischer, D. A., Genova, V.
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container_issue 24
container_start_page
container_title Applied physics letters
container_volume 97
creator Rumaiz, Abdul K.
Woicik, J. C.
Carini, G. A.
Siddons, D. P.
Cockayne, E.
Huey, E.
Lysaght, P. S.
Fischer, D. A.
Genova, V.
description Hard x-ray photoelectron spectroscopy has been used to study the band alignment between atomic layer deposited HfO2 on clean Ge (100) and nitrogen treated Ge (100) surfaces. The position of the valence-band maximum was determined by convolving theoretically calculated density of states from first-principles calculations and comparing with experimental valence-band data. Using Kraut’s method, the valence-band offsets were found to be 3.2±0.1 and 3.3±0.1 eV for the samples grown on clean and N passivated Ge, respectively. The oxide charge measured from capacitance-voltage measurements shows a significant increase between the two samples; however, the small change in the band offset between the two systems strongly indicates negligible contribution of the interface to the conduction/valence-band barrier and the band alignment of the heterojunctions.
doi_str_mv 10.1063/1.3524262
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subjects ALIGNMENT
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
GERMANIUM
HETEROJUNCTIONS
NITROGEN
OXIDES
X-RAY PHOTOELECTRON SPECTROSCOPY
title Band alignment of atomic layer deposited HfO2 on clean and N passivated germanium surfaces
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