PATENT CLAIM ANALYSIS

Application Number: 15946060
Application Type: Utility
Filing Date: 2018-04
Publication Date: 2018-08
Patent Classification: ["257", "493000"]

Abstract:
To provide a semiconductor device including a power semiconductor element having improved reliability. The semiconductor device has a cell region and a peripheral region formed outside the cell region. The n type impurity concentration of n type column regions in the cell region is made higher than that of n type column regions comprised of an epitaxial layer in the peripheral region. Further, a charge balance is kept in each of the cell region and the peripheral region and each total electric charge is set so that a total electric charge of first p type column regions and a total electric charge of n type column regions in the cell region become larger than a total electric charge of third p type column regions and n type column regions comprised of an epitaxial layer in the peripheral region, respectively.

Claim (Index 1):
A method of manufacturing a semiconductor device having a cell region and a peripheral region formed outside the cell region, comprising the following steps of:\n (a) providing a semiconductor substrate having on the main surface thereof a first epitaxial layer of a first conductivity type, (b) introducing an impurity of the first conductivity type into the first epitaxial layer in the cell region by ion implantation to form a plurality of first column regions while separating the regions from each other in a first direction, (c) after the step (b), introducing an impurity of a second conductivity type, which is a conductivity type different from the first conductivity type, into the first epitaxial layer in the cell region to form a plurality of second column regions in a partial region of the first epitaxial layer sandwiched between the first column regions adjacent to each other, and (d) introducing an impurity of the second conductivity type into the first epitaxial layer in the peripheral region by ion implantation to form a plurality of third column regions while separating the regions from each other in the first direction, wherein a concentration of the first conductivity type impurity of the first column regions in the cell region is higher than a concentration of an impurity of the first conductivity type of the first epitaxial layer in the peripheral region.

Metadata:
- Claim Count in Document: 1.0
- Percentile: 91.0
- Lexical Diversity: 2.68519
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14705057', '15062029', '13105889', '14995996', '13731065']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9248080214049352
- 35 USC 102 Novelty (BERT): 0.6091330824477568
- Combined Prediction Score: 0.8932405275092176
- Mean Citation Score: 353.0692
- Max Citation Score: 555.88916
- Similarity Product: 490.8081901852226

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

Dataset: test