PATENT CLAIM ANALYSIS

Application Number: 15989399
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 formed on an n + -type silicon carbide semiconductor substrate, p + -type base regions formed in the n-type silicon carbide epitaxial layer, a dense n-type region formed in the n-type silicon carbide epitaxial layer, a p-type base layer formed on the dense n-type region, an n + -type source region and a p ++ -type contact region formed in the p-type base layer, a trench penetrating the p-type base layer in a depth direction of a part of one of the p + -type base regions, and a gate electrode formed on a gate insulating film in the trench. The n + -type source region is formed using two dopant types, phosphorus and carbon. A dose amount D C  of carbon satisfies 0.7≤D C /D p ≤1.3 with respect to a dose amount D p  of phosphorus. An impurity concentration of the n + -type source region ranges from 10 18  to 10 21 .

Claim (Index 7):
A method of manufacturing a semiconductor device, the method comprising:\n providing a silicon carbide semiconductor substrate of the first conductivity type having a high impurity concentration; forming a first silicon carbide semiconductor layer of a first conductivity type on a surface of the silicon carbide semiconductor substrate of the first conductivity type, the first silicon carbide semiconductor layer having a low impurity concentration; selectively forming a first base region of a second conductivity type and a second base region of the second conductivity type in a surface layer of the first silicon carbide semiconductor layer; forming a second silicon carbide semiconductor layer of the second conductivity type on a surface of the first silicon carbide semiconductor layer, the second silicon carbide semiconductor layer having a low impurity concentration; selectively forming a source region of the first conductivity type in a surface of the second silicon carbide semiconductor layer; forming a contact region of the second conductivity type in the surface of the second silicon carbide semiconductor layer, the contact region being adjacent to the source region; forming a trench at a part of the source region in the surface of the second silicon carbide semiconductor layer, the trench penetrating the second silicon carbide semiconductor layer, being shallower than the second base region, and having a bottom and sides; forming a gate insulating film on the bottom and the sides of the trench; forming a gate electrode on the gate insulating film; forming an interlayer insulating film on the gate electrode; forming a source electrode on surfaces of the source region and the contact region; and forming a drain electrode on a rear surface of the silicon carbide semiconductor substrate, wherein forming the source region includes using two dopant types that are phosphorus and carbon, a dose amount, D C , of carbon satisfying 0.7\u2264D C /D p \u22641.3 with respect to a dose amount, D p , of phosphorus, and the source region has an impurity concentration ranging from 10 18  to 10 21 .

Metadata:
- Claim Count in Document: 7.0
- Percentile: 93.0
- Lexical Diversity: 2.55072
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15846075', '15909977', '15854540', '15716919', '15724188']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9331720136103726
- 35 USC 102 Novelty (BERT): 0.5228713669721663
- Combined Prediction Score: 0.892141948946552
- Mean Citation Score: 348.81388400000014
- Max Citation Score: 352.59744
- Similarity Product: 334.2133676457024

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