PATENT CLAIM ANALYSIS

Application Number: 15915979
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-10
Patent Classification: ["257", "077000"]

Abstract:
Provided is a MOS gate using a thermally oxidized film as a gate insulating film on the front surface of a silicon carbide substrate. A ratio of an excess carbon amount at an SiO 2 /SiC interface in relation to a carbon amount in the silicon carbide substrate is 0.1 or less. The excess carbon at the SiO 2 /SiC interface is generated during thermal oxidation for forming the gate insulating film. The excess carbon is a compound constituted of carbon atoms having the pi (it) bonds, and specifically is graphite, for example. The amount of nitrogen at the SiO 2 /SiC interface is 1.4×10 15 /cm 2  to 1.8×10 15 /cm 2 , inclusive, for example.

Claim (Index 1):
A silicon carbide semiconductor device, comprising:\n a semiconductor substrate made of silicon carbide; a gate insulating film in contact with the semiconductor substrate on one main surface of the semiconductor substrate; and a gate electrode that is provided along the gate insulating film, and that opposes the semiconductor substrate with the gate insulating film sandwiched therebetween, wherein the gate insulating film is a thermally oxidized film, wherein nitrogen and excess carbon made of carbon atoms having the pi (n) bonds are present at an interface between the gate insulating film and the semiconductor substrate, wherein a ratio of an amount of the excess carbon at the interface between the gate insulating film and the semiconductor substrate, to an amount of carbon in a bulk of the semiconductor substrate is 0.1 or less, wherein the amount of the excess carbon at the interface between the gate insulating film and the semiconductor substrate is determined by an integral of area intensities of energy loss intensity distributions due to carbon atoms having the pi (\u03c0) bonds in the excess carbon obtained by Electron Energy Loss Spectroscopy, and wherein the amount of the carbon in the bulk of the semiconductor substrate is determined by an area intensity of an energy loss intensity distribution due to carbon atoms having the sigma (\u03c3) bonds in the silicon carbide of the bulk of the semiconductor substrate obtained by the Electron Energy Loss Spectroscopy.

Metadata:
- Claim Count in Document: 38.0
- Percentile: 90.0
- Lexical Diversity: 1.98438
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14778058', '10494616', '14960285', '15691107', '11991249']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.919806332561352
- 35 USC 102 Novelty (BERT): 0.5058684219508097
- Combined Prediction Score: 0.8784125415002979
- Mean Citation Score: 250.899142
- Max Citation Score: 284.2237
- Similarity Product: 214.56092246674896

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 0
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test