Journal
APPLIED SURFACE SCIENCE
Volume 427, Issue -, Pages 480-485Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.08.220
Keywords
3C-SiC; XPS; LEED; HREELS; Band diagram; Wet chemical etching; Work function; Interface
Categories
Funding
- DFG [GSC 1070]
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The (001) surface of cubic silicon carbide (3C SiC) after cleaning, Ar sputtering and three different wet chemical etching procedures was thoroughly investigated via (angle resolved) XPS, HREELS, and LEED. While Ar sputtering was found to be unsuitable for surface preparation, all three employed wet chemical etching procedures (piranha/NH4F, piranha/HF, and RCA) provide a clean surface. HF as oxide removal agent tends to result in fluorine traces on the sample surface, despite thorough rinsing. All procedures yield a 1 x 1 SiOH/CH terminated surface. However, the XPS spectra reveal some differences in the resulting surface states. NH4F for oxide removal produces a flat band situation, whereas the other two procedures result in a slight downward (HF) or upward (RCA) band bending. Because the band bending is small, it can be concluded that the number of unsaturated surface defects is low. (C) 2017 Elsevier B.V. All rights reserved.
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