PATENT CLAIM ANALYSIS

Application Number: 15917415
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-07
Patent Classification: ["438", "135000"]

Abstract:
A method for fabricating an anode-shorted field stop insulated gate bipolar transistor (IGBT) comprises selectively forming first and second semiconductor implant regions of opposite conductivity types. A field stop layer of a second conductivity type can be grown onto or implanted into the substrate. An epitaxial layer can be grown on the substrate or on the field stop layer. One or more insulated gate bipolar transistors (IGBT) component cells are formed within the epitaxial layer.

Claim (Index 1):
A method for fabricating an anode-shorted field stop insulated gate bipolar transistor (IGBT), comprising:\n a) forming one or more insulated gate bipolar transistors (IGBT) component cells within a top surface of an epitaxial layer of a first conductivity type; b) thinning a back surface of the epitaxial layer to a desired thickness; c) performing a blanket implant of the first conductivity type to the back surface of the epitaxial layer to form a field stop layer, wherein a concentration of charge carriers in the field stop layer is greater than that of the epitaxial layer; d) selectively implanting first semiconductor regions of a second conductivity type that is opposite the first conductivity type within a back surface of the field stop layer using a first shadow mask, wherein a concentration of charge carriers in the first semiconductor regions is greater than that of the field stop layer; e) selectively implanting second semiconductor regions of the first conductivity type within a back surface of the field stop layer using a second shadow mask, wherein a concentration of charge carriers in the second semiconductor regions is greater than that of the field stop layer; and f) laser activating the first and second semiconductor regions; g) depositing a metal layer to a back surface of the first and second semiconductor regions.

Metadata:
- Claim Count in Document: 1.0
- Percentile: 90.0
- Lexical Diversity: 1.59615
- Patent Class: 438.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['13192385', '15177191', '12484170', '13024256', '15479281']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.876102240533544
- 35 USC 102 Novelty (BERT): 0.5517548077459191
- Combined Prediction Score: 0.8436674972547815
- Mean Citation Score: 316.872154
- Max Citation Score: 423.19415
- Similarity Product: 351.46289574614764

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