PATENT CLAIM ANALYSIS

Application Number: 15923787
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-08
Patent Classification: ["257", "194000"]

Abstract:
In a group III nitride-type field effect transistor, the present invention reduces a leak current component by conduction of residual carriers in a buffer layer, and achieves improvement in a break-down voltage, and enhances a carrier confinement effect (carrier confinement) of a channel to improve pinch-off characteristics (to suppress a short channel effect). For example, when applying the present invention to a GaN-type field effect transistor, besides GaN of a channel layer, a composition-modulated (composition-gradient) AlGaN layer in which aluminum composition reduces toward a top gradually or stepwise is used as a buffer layer (hetero buffer). To gate length Lg of a FET to be prepared, a sum a of layer thicknesses of an electron supply layer and a channel layer is selected so as to fulfill Lg/a≥5, and in such a case, the layer thickness of the channel layer is selected in a range of not exceeding 5 times (about 500 Å) as long as a de Broglie wavelength of two-dimensional electron gas accumulated in the channel layer in room temperature.

Claim (Index 2):
The semiconductor device according to  claim 1 , wherein an Al composition of the AlGaN buffer layer is step-wisely reduced in a direction from the substrate toward the GaN channel layer.

Metadata:
- Claim Count in Document: 3.0
- Percentile: 90.0
- Lexical Diversity: 1.94
- Patent Class: 257.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['14470403', '12159599', '12919640', '14117763', '15699251']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.936864927537326
- 35 USC 102 Novelty (BERT): 0.6386493885068752
- Combined Prediction Score: 0.907043373634281
- Mean Citation Score: 402.988698
- Max Citation Score: 595.89984
- Similarity Product: 575.4004674666596

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