PATENT CLAIM ANALYSIS

Application Number: 15755098
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2018-08
Patent Classification: ["257", "077000"]

Abstract:
An active cell region, an edge termination region surrounding the active cell region and an intermediate region located at an intermediate position between these regions are provided, the active cell region has a trench gate type MOS structure on a top side, and a vertical structure on a bottom side includes a p-collector layer, an n-buffer layer on the p-collector layer, and an n-drift layer on the n-buffer layer, the n-buffer layer has a first buffer portion provided on the p-collector layer side, and a second buffer portion provided on the n-drift layer side, the peak impurity concentration of the first buffer portion is higher than the peak impurity concentration of the second buffer portion, and the impurity concentration gradient on the n-drift layer side of the second buffer portion is gentler than the impurity concentration gradient on the n-drift layer side of the first buffer portion.

Claim (Index 26):
A method for manufacturing a semiconductor device, characterized in that a vertical structure on a bottom side of a substrate includes an impurity layer doped with impurities, an n-buffer layer provided on the impurity layer, and an n-drift layer on the n-buffer layer, and the n-buffer layer having buffer portions of three or more layers that are different in peak impurity concentration and distance from a back surface of the n-buffer layer is formed by completing activation annealing on a first buffer portion which is a buffer portion nearest to the impurity layer among a plurality of the buffer portions, and then forming the remaining buffer portions.

Metadata:
- Claim Count in Document: 53.0
- Percentile: 88.0
- Lexical Diversity: 3.07843
- Patent Class: 257.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: False
- Related Applications: ['14678797', '15533615', '14111168', '14784170', '13994424']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.919898120591472
- 35 USC 102 Novelty (BERT): 0.5196725415154925
- Combined Prediction Score: 0.8798755626838741
- Mean Citation Score: 287.140746
- Max Citation Score: 302.5694
- Similarity Product: 232.6238551064133

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