Proceedings ICSCRM 2005, published in Mat. Sci. Forum 527-529, 1023 (2006).

Scanning Tunneling Spectroscopy of Oxidized 6H-SiC Surfaces

S. Nie and R. M. Feenstra
Dept. Physics, Carnegie Mellon University, Pittsburgh, PA 15213


Scanning tunneling microscopy and spectroscopy has been used to study the electronic states of oxidized 6H-SiC interfaces. The SiC surfaces were oxidized by annealing in an ultra-high vacuum chamber at 600-800C under 110-7 Torr pressure of molecular oxygen. Tunneling spectra revealed two dominant states at 1.8 and 1.5 eV relative to the Fermi level, which lie outside the band gap region but are inhomogeneously broadened such that they extend into the gap, together with additional features within the band gap.

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