Band offsets of Al2O3 and HfO2 oxides deposited by atomic layer deposition technique on hydrogenated diamond

High-k oxide insulators (Al2O3 and HfO2) have been deposited on a single crystalline hydrogenated diamond (H-diamond) epilayer by an atomic layer deposition technique at temperature as low as 120 °C. Interfacial electronic band structures are characterized by X-ray photoelectron spectroscopy. Based...

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Bibliographic Details
Published in:Applied physics letters 2012-12, Vol.101 (25)
Main Authors: Liu, J. W., Liao, M. Y., Imura, M., Koide, Y.
Format: Article
Language:English
Subjects:
Aluminum oxide
Deposition
Diamonds
Energy gaps (solid state)
Hafnium oxide
Offsets
Oxides
Valence band
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Summary:High-k oxide insulators (Al2O3 and HfO2) have been deposited on a single crystalline hydrogenated diamond (H-diamond) epilayer by an atomic layer deposition technique at temperature as low as 120 °C. Interfacial electronic band structures are characterized by X-ray photoelectron spectroscopy. Based on core-level binding energies and valence band maximum values, valence band offsets are found to be 2.9 ± 0.2 and 2.6 ± 0.2 eV for Al2O3/H-diamond and HfO2/H-diamond heterojunctions, respectively. Band gaps of the Al2O3 and HfO2 have been determined to be 7.2 ± 0.2 and 5.4 ± 0.2 eV by measuring O 1s energy loss spectra, respectively. Both the Al2O3/H-diamond and HfO2/H-diamond heterojunctions are concluded to be type-II staggered band configurations with conduction band offsets of 1.2 ± 0.2 and 2.7 ± 0.2 eV, respectively.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4772985