PATENT CLAIM ANALYSIS

Application Number: 16016510
Application Type: Utility
Filing Date: 2018-06
Publication Date: 2019-02
Patent Classification: ["257", "622000"]

Abstract:
A new semiconductor rectifier structure. In general, a MOS-transistor-like structure is located above a JFET-like deeper structure. The present application teaches ways to combine and optimize these two structures in a merged device so that the resulting combined structure achieves both a low forward voltage and a high reverse breakdown voltage in a relatively small area. In one class of innovative implementations, an insulated (or partially insulated) trench is used to define a vertical channel in a body region along the sidewall of a trench, so that majority carriers from a “source” region (typically n+) can flow through the channel. An added “pocket” diffusion, of the same conductivity type as the body region (p-type in this example), provides an intermediate region around the bottom of the trench. This intermediate diffusion, and an additional deep region of the same conductivity type, define a deep JFET-like device which is in series with the MOS channel portion of the diode. This advantageously permits the MOS channel portion to be reasonably short, and to have a reasonably low threshold voltage, since the high-voltage withstand characteristics are defined by the deep JFET-like device.

Claim (Index 30):
A process for making a semiconductor rectifier device, comprising the actions of, on a first-conductivity-type semiconductor die:\n a) performing on a first surface of the die, in any order, the steps of forming a first-conductivity-type source region,\n forming a second-conductivity-type body region underlying the source region, \n forming second-conductivity-type body contact regions which extend down through the body region into an underlying first-conductivity-type drift region of the die, and \n forming, at locations where a gate trench will be located, a second-conductivity-type intermediate region which is vertically separated from the body region by the drift region, \n wherein a top layer remains in place, on the first surface, while the body and intermediate regions are implanted; and \n b) after action a), performing, in any order, the steps of\n forming an insulated gate trench extending down through the body region and through the drift region into the intermediate region, \n forming a conductive gate electrode inside the insulated gate trench, and \n removing the top layer.

Metadata:
- Claim Count in Document: 45.0
- Percentile: 94.0
- Lexical Diversity: 1.84483
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['11982764', '12238308', '10146539', '11982792', '11982781']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.922309520895936
- 35 USC 102 Novelty (BERT): 0.492695595951086
- Combined Prediction Score: 0.879348128401451
- Mean Citation Score: 236.687304
- Max Citation Score: 243.55795
- Similarity Product: 183.773684835422

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