PATENT CLAIM ANALYSIS

Application Number: 15760458
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-09
Patent Classification: ["257", "330000"]

Abstract:
A power semiconductor device of the present invention includes: a semiconductor base body which has a super junction structure formed of a plurality of first conductive-type columnar regions and a plurality of second conductive-type columnar regions; a plurality of trenches; gate insulation films; gate electrodes; an interlayer insulation film; contact holes formed such that two or more contact holes are formed between two trenches disposed adjacently to each other; metal plugs formed by filling the inside of the contact holes with metal; and an electrode, wherein a first conductive-type high concentration diffusion region is formed only between the trench and the metal plug disposed closest to the trench between each two trenches disposed adjacently to each other. According to the power semiconductor device of the present invention, it is possible to provide a power semiconductor device which satisfies a demand for reduction in cost and downsizing of electronic equipment, and has a large breakdown strength.

Claim (Index 9):
A method of manufacturing a power semiconductor device for manufacturing the power semiconductor device described in  claim 1 , the method comprising in the following order:\n a semiconductor base body preparing step of preparing a semiconductor base body having a low resistance semiconductor layer, and a plurality of first conductive-type columnar regions and a plurality of second conductive-type columnar regions formed on the low resistance semiconductor layer such that the first conductive-type columnar region and the second conductive-type columnar region are alternately formed along a predetermined direction, wherein the second conductive-type columnar regions is formed by epitaxially growing a second conductive-type semiconductor material, and a super junction structure is formed of the plurality of first conductive-type columnar regions and the plurality of second conductive-type columnar regions; a trench forming step of forming a plurality of trenches within regions where the first conductive-type columnar regions are formed; a gate electrode forming step of forming a gate insulation film on an inner peripheral surface of each trench and forming a gate electrode in each trench by way of the gate insulation film; a base region forming step of forming second conductive-type base regions such that the second conductive-type base regions reach a depth position shallower than bottom portions of the trenches from surfaces of the plurality of first conductive-type columnar regions and the surfaces the plurality of second conductive-type columnar regions; a first conductive-type high concentration diffusion region forming step of forming first conductive-type high concentration diffusion regions in predetermined regions of surfaces of the base regions such that at least a portion of the first conductive-type high concentration diffusion region is exposed on an inner peripheral surface of each trench; an interlayer insulation film forming step of forming an interlayer insulation film which covers the base regions, the first conductive-type high concentration diffusion regions, the gate insulation film and the gate electrodes; a contact hole forming step of forming contact holes such that the contact holes penetrate the interlayer insulation film and reach at least the base regions, and two or more contact holes are formed between each two trenches disposed adjacently to each other; a second conductive-type high concentration diffusion region forming step of forming second conductive-type high concentration diffusion regions which are brought into contact with bottom surfaces of the contact holes and have higher dopant concentration than the base regions; a metal plug forming step of forming metal plugs by filling the inside of the contact holes with metal; and an electrode forming step of forming an electrode which is electrically connected with the base regions, the first conductive-type high concentration diffusion regions and the second conductive-type high concentration diffusion regions through the metal plugs on the interlayer insulation film, wherein in the contact hole forming step, between two trenches disposed adjacently to each other, the contact hole disposed closest to the trench is formed such that the first conductive-type high concentration diffusion region is formed only between the trench and the metal plug disposed closest to the trench.

Metadata:
- Claim Count in Document: 18.0
- Percentile: 90.0
- Lexical Diversity: 2.0
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['16060058', '16060416', '15303730', '15514630', '15514615']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9270313068420188
- 35 USC 102 Novelty (BERT): 0.533454630929343
- Combined Prediction Score: 0.8876736392507512
- Mean Citation Score: 315.990084
- Max Citation Score: 374.34518
- Similarity Product: 316.87584631235126

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