PATENT CLAIM ANALYSIS

Application Number: 16388807
Application Type: Utility
Filing Date: 2019-04
Publication Date: 2019-08
Patent Classification: ["257", "077000"]

Abstract:
A silicon carbide semiconductor device includes: n type regions formed on a surface of the n− type epitaxial layer; p type body regions formed at positions deeper than the n type regions; p− type channel regions each reaching the p type body region; and n++ type source regions formed toward the p type body region from the front surface side of the epitaxial layer, and the p− type channel regions and the n++ type source regions are formed at a planar position where the n type region remains between the p− type channel region and the n++ type source region, and out of boundary surfaces which are formed between the p− type channel region and the n type regions, the boundary surface on an outer peripheral side is positioned inside an outer peripheral surface  116 a  of the p type body region as viewed in a plan view.

Claim (Index 2):
A method of manufacturing a silicon carbide semiconductor device comprising:\n an epitaxial layer of a first conductive type; a body region of a second conducive type formed at a predetermined depth position on a surface side of the epitaxial layer of the first conductive type; a channel region of a second conductive type formed such that the channel region of the second conductive type reaches the body region of the second conductive type from the front surface side of the epitaxial layer of the first conductive type, the channel region of the second conductive type having lower impurity concentration than the body region of the second conductive type; a second semiconductor region of a first conductive type formed toward the body region of the second conductive type from the front surface side of the epitaxial layer of the first conductive type, the second semiconductor region of the first conductive type having higher impurity concentration than the epitaxial layer of the first conductive type; a body contact region of a second conductive type formed such that the body contact region of the second conductive type reaches the body region of the second conductive type from the front surface side of the epitaxial layer of the first conductive type, the body contact region of the second conductive type having higher impurity concentration than the body region of the second conductive type, and a gate electrode formed on at least the channel region of the second conductive type with a gate insulating film interposed therebetween, wherein the channel region of the second conductive type and the second semiconductor region of the first conductive type are formed at a planar position where the epitaxial layer of the first conductive type remains between the channel region of the second conductive type and the second semiconductor region of the first conductive type, and out of boundary surfaces which are formed between the channel region of the second conductive type and the epitaxial layers of the first conductive type, the boundary surface on an outer peripheral side is positioned inside an outer peripheral surface of the body region of the second conductive type as viewed in a plan view, wherein the method comprising the steps of: preparing a silicon carbide semiconductor substrate provided with the epitaxial layer of the first conductive type; forming the body region of the second conductive type on a surface of the epitaxial layer of the first conductive type within a predetermined depth region; forming the channel region of the second conductive type, the second semiconductor region of the first conductive type and a body contact region of a second conductive type on the front surface of the epitaxial layer of the first conductive type; and forming the gate electrode on at least the channel region of the second conductive type with a gate insulating film interposed therebetween, wherein in the step of forming the channel region of the second conductive type, the second semiconductor region of the first conductive type and the body contact region of the second conductive type, the channel region of the second conductive type, the second semiconductor region of the first conductive type and the body contact region of the second conductive type are formed at a planar position where the epitaxial layer of the first conductive type remains between the channel region of the second conductive type and the second semiconductor region of the first conductive type, and out of boundary surfaces which are formed between the channel region of the second conductive type and the epitaxial layers of the first conductive type, the boundary surface on an outer peripheral side is positioned inside an outer peripheral surface of the body region of the second conductive type as viewed in a plan view.

Metadata:
- Claim Count in Document: 7.0
- Percentile: 100.0
- Lexical Diversity: 2.51613
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15314095', '15397677', '14897247', '16169868', '12639054']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9276330603875552
- 35 USC 102 Novelty (BERT): 0.5736185772177983
- Combined Prediction Score: 0.8922316120705795
- Mean Citation Score: 329.734202
- Max Citation Score: 453.42062
- Similarity Product: 441.88031247192384

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

Dataset: test