期刊
APPLIED PHYSICS LETTERS
卷 93, 期 17, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.2992199
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资金
- U.S. Department of Energy (DOE) [DE-FG36-05GO85032]
- Nevada System of Higher Education [NSHE 07-101, 08-03]
- DOE [DE-AC02-05CH11231]
- Deutsche Forschungsgemeinschaft
The interface between n-type GaN and V-based contacts was characterized by soft x-ray spectroscopy. We have investigated the chemical interface structure before and after a rapid thermal annealing (RTA) step, which is crucial for the formation of an Ohmic contact. X-ray photoelectron and x-ray excited Auger electron spectra suggest that RTA induces an accumulation of metallic Ga at the surface. Using x-ray emission spectroscopy, we find that the probed nitrogen atoms are in a VN-like environment, indicating that vanadium interacts with nitrogen atoms from the GaN to form VN. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.2992199]
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