PATENT CLAIM ANALYSIS

Application Number: 15982543
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2018-09
Patent Classification: ["257", "077000"]

Abstract:
In a vertical MOSFET of a trench gate structure, a high-concentration implantation region is provided in a p-type base region formed from a p-type silicon carbide layer formed by epitaxial growth, so as to include a portion in which a channel is formed. The high-concentration implantation region is formed by ion implantation of a p-type impurity into the p-type silicon carbide layer. The high-concentration implantation region is formed by p-type ion implantation and has an impurity concentration profile in which concentration differences in a depth direction form a bell-shaped curve at a peak of impurity concentration that is higher than that of the p-type silicon carbide layer. In the p-type base region, disorder occurs partially in the crystal structure consequent to the ion implantation for forming the high-concentration implantation region.

Claim (Index 1):
A method of manufacturing a silicon carbide semiconductor device, the method comprising:\n forming a first epitaxial layer of a first conductivity type on a front surface of a silicon carbide substrate; forming a second epitaxial layer of a second conductivity type on the first epitaxial layer; selectively forming a first semiconductor region of the second conductivity type by ion implantation in the second epitaxial layer, the first semiconductor region having an impurity concentration higher than that of the second epitaxial layer; selectively forming a second semiconductor region of the first conductivity type in the second epitaxial layer, at a depth shallower than the first semiconductor region; forming a trench to penetrate the second semiconductor region, the first semiconductor region, and the second epitaxial layer, and reach the first epitaxial layer; forming a gate insulating film in the trench; forming a gate electrode in the trench such that the gate electrode is surrounded in the trench by the gate insulating film; forming a first electrode contacting the second semiconductor region and the second epitaxial layer; and forming a second electrode on a rear surface of the silicon carbide substrate, wherein the first semiconductor region is formed to have a second-conductivity-type impurity concentration profile in which concentration differences in a depth direction form a bell-shaped curve at a peak of impurity concentration higher than that of the second epitaxial layer.

Metadata:
- Claim Count in Document: 28.0
- Percentile: 93.0
- Lexical Diversity: 2.2459
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15397677', '15394950', '15846075', '15279450', '14428840']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.931684015083229
- 35 USC 102 Novelty (BERT): 0.5657254673367578
- Combined Prediction Score: 0.8950881603085818
- Mean Citation Score: 380.60464
- Max Citation Score: 443.02316
- Similarity Product: 417.1279882527114

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