PATENT CLAIM ANALYSIS

Application Number: 15961013
Application Type: Utility
Filing Date: 2018-04
Publication Date: 2018-12
Patent Classification: ["257", "330000"]

Abstract:
On a surface of an n-type silicon carbide epitaxial layer on an n + -type silicon carbide substrate, first and second p + -type base regions are formed in the n-type silicon carbide epitaxial layer, an n-type region is formed in the n-type silicon carbide epitaxial layer, a p-type base layer is formed on the n-type region, an n + -type source region and a p ++ -type contact region are formed in the p-type base layer, and a trench is formed to a position shallower than the second p + -type base region and penetrates the p-type base layer. A first sidewall angle of the trench at a position of the p-type base layer is 80° to 90° with respect to a main surface. A difference of the first sidewall angle and a second sidewall angle of the trench at a position deeper than a boundary of the p-type base layer and the n-type region is 1° to 25°.

Claim (Index 1):
A semiconductor device, comprising:\n a wide bandgap semiconductor substrate, being of the first conductivity type and having a main surface; a first wide bandgap semiconductor layer, being of a first conductivity type and having an impurity concentration lower than an impurity concentration of the substrate, the first wide bandgap semiconductor layer being disposed on the main surface of the substrate and having a first side and a second side opposite to the first side, the second side of the first wide bandgap semiconductor layer facing the substrate; a first base region of a second conductivity type, selectively disposed in the first wide bandgap semiconductor layer; a second base region of the second conductivity type, selectively disposed in the first wide bandgap semiconductor layer; a second wide bandgap semiconductor layer, being of the second conductivity type and being selectively disposed on the first side of the first wide bandgap semiconductor layer, the second wide bandgap semiconductor layer having a first side and a second side opposite to the first side, the second side of the second wide bandgap semiconductor layer facing the first side of the first wide bandgap semiconductor layer; a source region, being of the first conductivity type and being selectively disposed in a surface layer of the first side of the second wide bandgap semiconductor layer; a contact region, being of the second conductivity type and being selectively disposed in the surface layer of the first side of the second wide bandgap semiconductor layer; and a trench structure including a gate electrode in a trench, the trench penetrating the second wide bandgap semiconductor layer and reaching the second base region, the trench having\n a first sidewall, a position of which corresponds to a position in which the second wide bandgap semiconductor layer is disposed, a first angle of the first sidewall with respect to the main surface of the substrate being in a range of 80\u00b0 to 90\u00b0, and \n a second sidewall, a position of which corresponds to a position that is below a surface of the second side of the second wide bandgap semiconductor layer, a second angle of the second sidewall with respect to the main surface of the substrate being in a range of 1\u00b0 to 25\u00b0.

Metadata:
- Claim Count in Document: 32.0
- Percentile: 91.0
- Lexical Diversity: 3.16981
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15909977', '15854540', '15716919', '15291322', '15691223']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9163383011857288
- 35 USC 102 Novelty (BERT): 0.5171933888894974
- Combined Prediction Score: 0.8764238099561057
- Mean Citation Score: 315.517526
- Max Citation Score: 323.4997
- Similarity Product: 304.36913391815426

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

Dataset: test