PATENT CLAIM ANALYSIS

Application Number: 16119246
Application Type: Utility
Filing Date: 2018-08
Publication Date: 2019-04
Patent Classification: ["257", "077000"]

Abstract:
For example, a pin diode is constituted by a silicon carbide epitaxial substrate in which silicon carbide epitaxial layers constituting an n-type buffer region, an n − -type drift region, and a p ++ -type anode region are sequentially formed by epitaxial growth on a front surface of an n + -type silicon carbide substrate. The n − -type drift region has an n-type impurity concentration is, for example, about 1×10 14 /cm 3  to 1×10 16 /cm 3 . The n − -type drift region has a boron concentration that is substantially lower than an n-type impurity concentration of the n − -type drift region and that, for example, is about 1×10 14 /cm 3  or less. During epitaxial growth of the n − -type drift region, automatic doping of boron to the n − -type drift region is suppressed, whereby the boron concentration of the n − -type drift region is reduced and the n − -type drift region in which no traps are present is formed.

Claim (Index 1):
A silicon carbide semiconductor device comprising:\n a semiconductor substrate of a first conductivity type and containing silicon carbide; a first semiconductor region provided on a surface of the semiconductor substrate and constituted by a silicon carbide crystal layer of the first conductivity type and having an impurity concentration lower than an impurity concentration of the semiconductor substrate; and a second semiconductor region of a second conductivity type provided on a first side of the first semiconductor region, opposite a second side of the first semiconductor region facing toward the semiconductor substrate, the second semiconductor region forming a pn junction with the first semiconductor region, wherein an impurity concentration of a first impurity of the first conductivity type of the first semiconductor region is at most 1\u00d710 16 /cm 3 , and an impurity concentration of boron that is a second impurity different from the first impurity of the first conductivity type of the first semiconductor region is lower than the impurity concentration of the first impurity of the first conductivity type of the first semiconductor region and is at most 1\u00d710 14 /cm 3 .

Metadata:
- Claim Count in Document: 1.0
- Percentile: 96.0
- Lexical Diversity: 2.66176
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15846075', '15903181', '15988764', '15841461', '15030763']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9204961011293696
- 35 USC 102 Novelty (BERT): 0.4791955940173858
- Combined Prediction Score: 0.8763660504181714
- Mean Citation Score: 239.504388
- Max Citation Score: 243.73979
- Similarity Product: 218.43348380224705

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

Dataset: test