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Title: Characterization of very fast states in the vicinity of the conduction band edge at the SiO{sub 2}/SiC interface by low temperature conductance measurements

We have investigated the unique interface states (NI) generated by NO annealing at the SiO{sub 2}/SiC interfaces by low-temperature conductance measurements, which is more suitable for characterization of very fast interface states than high-frequency conductance measurements at room temperature. Although only a part of the NI states can be evaluated by measurements at room temperature, the whole picture of the NI states, especially near the conduction band edge (0.07 eV ≤ E{sub C}−E{sub T}), has been revealed by the low temperature measurements. The NI peak was present at the interface even without NO annealing. The NI density increased with NO annealing temperature. The NI density at the energy levels shallower than 0.2 eV exceeded 10{sup 12} cm{sup −2}eV{sup −1} after NO annealing. The capture cross section of the NI states is uniquely larger than that of conventional interface states.
Authors:
;  [1] ;  [2]
  1. Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510 (Japan)
  2. Power Electronics R and D Center, Rohm Co., Ltd., Kyoto 615-8585 (Japan)
Publication Date:
OSTI Identifier:
22271299
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; CAPTURE; CROSS SECTIONS; DENSITY; ELECTRIC CONDUCTIVITY; ELECTRONIC STRUCTURE; ENERGY LEVELS; FREQUENCY DEPENDENCE; HETEROJUNCTIONS; INTERFACES; NITRIC OXIDE; SILICON CARBIDES; TEMPERATURE DEPENDENCE