PATENT CLAIM ANALYSIS

Application Number: 16047057
Application Type: Utility
Filing Date: 2018-07
Publication Date: 2018-12
Patent Classification: ["257", "139000"]

Abstract:
A p anode layer is formed on one main surface of an n −  drift layer. N +  cathode layer having an impurity concentration more than that of the n −  drift layer is formed on the other main surface. An anode electrode is formed on the surface of the p anode layer. A cathode electrode is formed on the surface of the n +  cathode layer. N-type broad buffer region having a net doping concentration more than the bulk impurity concentration of a wafer and less than the n +  cathode layer and p anode layer is formed in the n −  drift layer. Resistivity ρ 0  of the n −  drift layer satisfies 0.12V 0 ≤ρ 0 ≤0.25V 0  with respect to rated voltage V 0 . Total amount of net doping concentration of the broad buffer region is equal to or more than 4.8×10 11  atoms/cm 2  and equal to or less than 1.0×10 12  atoms/cm 2 .

Claim (Index 16):
A semiconductor device comprising:\n a drift layer of a first-conductivity-type; an anode layer of a second-conductivity-type that is provided on a first main surface of the drift layer and has an impurity concentration more than that of the drift layer; a cathode layer of the first-conductivity-type that is provided on a second main surface of the drift layer and has an impurity concentration more than that of the drift layer; and a plurality of broad buffer layers of the first conductivity-type that are provided in the drift layer and each of the plurality of the broad buffer layers has an impurity concentration more than that of a portion of the drift layer excluding the plurality of broad buffer layers, and has a mountain-shaped impurity concentration distribution in which a local maximum value is less than the impurity concentration of the anode layer and the cathode layer, the mountain-shaped impurity concentration distribution having a peak at the local maximum value and differences of elevation in a depth direction, wherein the plurality of broad buffer layers are disposed at different depths from the first main surface, respectively, and the number of broad buffer layers close to the second main surface from an intermediate position of the drift layer is more than the number of broad buffer layers close to the first main surface from the intermediate position of the drift layer, wherein the number of broad buffer layers close to the first main surface from the intermediate position of the drift layer is at least one, and wherein number of broad buffer layers close to the second main surface from the intermediate position of the drift layer is at least two, wherein the broad buffer layer includes a hydrogen-related donor.

Metadata:
- Claim Count in Document: 8.0
- Percentile: 95.0
- Lexical Diversity: 2.59375
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14980433', '14730940', '14283578', '13505294', '14079072']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9378247549282936
- 35 USC 102 Novelty (BERT): 0.5816592205629992
- Combined Prediction Score: 0.9022082014917642
- Mean Citation Score: 422.573156
- Max Citation Score: 478.16306
- Similarity Product: 465.8454394693255

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

Dataset: test