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 1):
A semiconductor device, comprising:\n a silicon carbide semiconductor substrate of the first conductivity type having a high impurity concentration; a first silicon carbide semiconductor layer of a first conductivity type formed 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; a first base region of a second conductivity type selectively provided in a surface of the first silicon carbide semiconductor layer; a second silicon carbide semiconductor layer of the second conductivity type formed on the first silicon carbide semiconductor layer; a source region of the first conductivity type and a contact region of the second conductivity type formed selectively in a surface layer of the second silicon carbide semiconductor layer; a trench formed to penetrate the second silicon carbide semiconductor layer; a gate insulating film formed in the trench; and a gate electrode formed in the trench on the gate insulating film, wherein the source region is formed 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 having 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): 0.933202640638835
- 35 USC 102 Novelty (BERT): 0.5232429300988557
- Combined Prediction Score: 0.8922066695848371
- Mean Citation Score: 348.81388400000014
- Max Citation Score: 352.59744
- Similarity Product: 325.4641584762955

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