PATENT CLAIM ANALYSIS

Application Number: 15936387
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-08
Patent Classification: ["257", "139000"]

Abstract:
A method of manufacturing a semiconductor device, including implanting hydrogen atoms from a second principal surface of a semiconductor substrate, forming a plurality of second semiconductor layers that each have a carrier concentration higher than that of the first semiconductor layer and that have carrier concentration peak values at different depths from the second principal surface of the semiconductor substrate, applying a heat treatment process to promote generation of donors from the hydrogen atoms, implanting an impurity from the second principal surface of the semiconductor substrate, forming a third semiconductor layer in the semiconductor substrate at the second principal surface thereof, and applying another heat treatment process to locally heat the semiconductor substrate, so as to reduce the carrier concentration at an interface between the third semiconductor layer and the second semiconductor layer adjacent to the third semiconductor layer.

Claim (Index 1):
A method of manufacturing a semiconductor device, comprising:\n providing a semiconductor substrate of a first conductivity type that has a front surface device structure formed on a first principal surface thereof; a first implantation process of\n implanting hydrogen atoms from a second principal surface of the semiconductor substrate, to thereby form a first semiconductor layer, and \n forming, in the semiconductor substrate at the second principal surface thereof, a plurality of second semiconductor layers of the first conductivity type that each have a carrier concentration higher than that of the first semiconductor layer, the carrier concentrations having respective peak values thereof at different depths from the second principal surface of the semiconductor substrate; \n applying a first heat treatment process to promote generation of donors from the hydrogen atoms; a second implantation process of\n implanting an impurity of a second conductivity type from the second principal surface of the semiconductor substrate after the first heat treatment process, and \n forming a third semiconductor layer of the second conductivity type in the semiconductor substrate at the second principal surface thereof, a distance between the third semiconductor layer and the first principal surface of the semiconductor substrate being larger than a distance between each second semiconductor layer and the first principal surface of the semiconductor substrate; and \n applying a second heat treatment process to locally heat the semiconductor substrate, so as to activate the third semiconductor layer and reduce a carrier concentration at an interface between the third semiconductor layer and one of the second semiconductor layers adjacent to the third semiconductor layer, wherein a concentration ratio of a peak value of a carrier concentration of the third semiconductor layer to the carrier concentration at the interface between the third semiconductor layer and the one second semiconductor layer is no smaller than a predetermined value.

Metadata:
- Claim Count in Document: 17.0
- Percentile: 90.0
- Lexical Diversity: 2.53448
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15252562', '15694116', '15334356', '13299870', '12358241']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9179756128490612
- 35 USC 102 Novelty (BERT): 0.5224072062402197
- Combined Prediction Score: 0.8784187721881771
- Mean Citation Score: 224.831876
- Max Citation Score: 339.23688
- Similarity Product: 270.96755512812143

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

Dataset: test