PATENT CLAIM ANALYSIS

Application Number: 15993281
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2018-12
Patent Classification: ["257", "077000"]

Abstract:
A semiconductor device includes an n-type silicon carbide epitaxial layer on a front surface of an n + -type silicon carbide substrate. A first p + -type base region is provided in the n-type silicon carbide epitaxial layer and a breakdown voltage structure region is provided in an outer periphery of an active region through which a main current flows. A distance between the first p + -type base region and a front surface of the n + -type silicon carbide substrate is smaller than a distance between the breakdown voltage structure region and the front surface of the n + -type silicon carbide substrate.

Claim (Index 1):
A semiconductor device having an active region and a breakdown voltage structure region, comprising:\n a wide bandgap semiconductor substrate of a first conductivity type and containing a semiconductor material having a bandgap wider than that of silicon, the wide bandgap semiconductor substrate having a front surface and a rear surface; a first wide bandgap semiconductor layer of the first conductivity type provided on the front surface of the wide bandgap semiconductor substrate, the first wide bandgap semiconductor layer containing the semiconductor material having a bandgap wider than that of silicon, an impurity concentration of the first wide bandgap semiconductor layer being lower than an impurity concentration of the wide bandgap semiconductor substrate; a first base region of a second conductivity type selectively provided in a surface layer on a first side of the first wide bandgap semiconductor layer opposite to a second side of the first wide bandgap semiconductor layer facing the wide bandgap semiconductor substrate; a second base region of the second conductivity type selectively provided in the first wide bandgap semiconductor layer; a second wide bandgap semiconductor layer of the second conductivity type provided on a surface on the first side of the first wide bandgap semiconductor layer, the second wide bandgap semiconductor layer containing the semiconductor material having a bandgap wider than that of silicon; a source region of the first conductivity type selectively provided in the second wide bandgap semiconductor layer; a gate electrode provided in a trench, via a gate insulating film, the trench being in contact with the source region, penetrating the second wide bandgap semiconductor layer and reaching the first wide bandgap semiconductor layer; an interlayer insulating film provided on the gate electrode; a source electrode in contact with the source region and the second wide bandgap semiconductor layer; and a drain electrode provided on the rear surface of the wide bandgap semiconductor substrate, wherein the active region is a region through which a main current flows between the source electrode and the drain electrode, the breakdown voltage structure region is of the second conductivity type, and provided in an outer periphery of the active region, and in a depth direction, a first distance between the first base region and the front surface of the wide bandgap semiconductor substrate is smaller than a second distance between the breakdown voltage structure region and the front surface of the wide bandgap semiconductor substrate.

Metadata:
- Claim Count in Document: 7.0
- Percentile: 93.0
- Lexical Diversity: 2.45455
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15909977', '15291322', '15854540', '15961013', '15909971']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.920681991656816
- 35 USC 102 Novelty (BERT): 0.5396289835155619
- Combined Prediction Score: 0.8825766908426907
- Mean Citation Score: 354.31471600000015
- Max Citation Score: 373.83313
- Similarity Product: 347.3130669080168

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

Dataset: test