PATENT CLAIM ANALYSIS

Application Number: 16069914
Application Type: Utility
Filing Date: 2018-07
Publication Date: 2019-01
Patent Classification: ["257", "077000"]

Abstract:
A method for manufacturing a compound semiconductor device includes: providing a semiconductor substrate including a foundation layer having a first conductivity type; forming a deep trench in the foundation layer; and forming a deep layer having a second conductivity type by introducing material gas of the compound semiconductor while introducing dopant gas into an epitaxial growth equipment to cause epitaxial growth of the deep layer in the deep trench. A period in which a temperature in the epitaxial growth equipment is increased to a temperature of the epitaxial growth of the deep layer is defined as a temperature increasing period. In the forming the deep layer, the deep layer is further formed in a bottom corner portion of the deep trench by starting the introducing of the dopant gas during the temperature increasing period and starting the introducing of the material gas after the temperature increasing period.

Claim (Index 11):
The compound semiconductor device according to  claim 9 , wherein\n the compound semiconductor device comprises a vertical MOSFET that includes:\n the semiconductor substrate including a rear surface layer disposed on a rear side of the semiconductor substrate and a drift layer disposed on a front side of the semiconductor substrate, the rear surface layer having a higher impurity concentration and the drift layer having a lower impurity concentration lower than the rear surface layer, the drift layer having the first conductivity type and providing the foundation layer; \n a base region disposed on the drift layer and having the second conductivity type; \n a source region disposed above the base region, having the first conductivity type, and having an impurity concentration higher than the drift layer; \n a trench gate structure provided in a gate trench and including a gate insulation film and a gate electrode, the gate trench extending from a surface of the source region to a position deeper than the base region, the gate insulation film being disposed on an inner wall surface of the gate trench, and the gate electrode being disposed on the gate insulation film; \n a source electrode electrically connected to the source region; and \n a drain electrode electrically connected to the rear surface layer disposed on the rear side of the semiconductor substrate, \n the deep trench penetrates the source region and the base region to reach the drift layer, and the deep layer is disposed in the deep trench.

Metadata:
- Claim Count in Document: 38.0
- Percentile: 95.0
- Lexical Diversity: 2.56667
- Patent Class: 257.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['16069927', '16069622', '16070061', '14387425', '15297261']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.933560422082114
- 35 USC 102 Novelty (BERT): 0.5336012323529279
- Combined Prediction Score: 0.8935645031091953
- Mean Citation Score: 310.667586
- Max Citation Score: 368.48938
- Similarity Product: 313.2503769061565

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

Dataset: test