GaN Switching Device Non-Planar Structure Carrier Control
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Solution Overview
Problem
Existing methods for manufacturing enhanced gallium nitride switching devices face challenges such as low threshold voltage, current collapse effects, and instability due to etching and doping issues, which affect the reliability and performance of high-power and high-frequency devices.
Innovation Solution
The method involves forming non-planar structures on the substrate and channel layer to interrupt two-dimensional electron gas, eliminating the need for etching the barrier layer and reducing the requirement for p-type doping, thereby enhancing device stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If etching is used to locally decrease aluminum gallium nitride layer thickness below gate electrode, then carrier concentration is reduced, but manufacturing precision deteriorates due to difficulty in controlling etching thickness
Solution Approach 1:
The patent extracts and removes the aluminum gallium nitride barrier layer selectively in the gate region through etching, creating a localized reduction in barrier layer thickness. This extraction approach directly reduces the two-dimensional electron gas concentration below the gate electrode, achieving the desired carrier concentration control while accepting the manufacturing precision challenges inherent in selective etching processes.
Solution Approach 2:
The patent applies local quality by creating a non-uniform barrier layer structure where the aluminum gallium nitride layer thickness varies spatially. The barrier layer is locally thinned or removed specifically in the gate region while maintaining full thickness in other areas, thereby achieving localized carrier concentration control without affecting the overall device structure.
2Quantity of substance
If fluoride plasma processing is used to inject negative ions into barrier layer, then two-dimensional electron gas is depleted, but reliability deteriorates due to crystal structure destruction
Solution Approach 1:
The patent replaces the chemical/mechanical fluoride plasma processing method with a controlled etching approach. Instead of using aggressive fluoride ions that can damage the crystal structure, the invention employs a more controlled barrier layer removal process that achieves the same electrical effect (carrier depletion) while preserving the structural integrity of the gallium nitride crystal lattice.
3Strength
If p-type aluminum gallium nitride is used below gate electrode, then conduction band energy level is increased, but productivity deteriorates due to insufficient hole density
Solution Approach 1:
The patent creates a localized region with modified electrical properties by removing the barrier layer in the gate region, effectively copying the electrical characteristics of a p-type structure (high conduction band) without actually introducing p-type doping. This approach achieves the desired energy level modification while avoiding the productivity limitations associated with low hole density in p-type gallium nitride.
Data Source
AI summary
A method of manufacturing an enhanced device and an enhance device are provided. The method comprises: preparing a substrate, and forming a non-planar structure in the substrate; depositing a nitride channel layer on the substrate, a gate region, a source region and a drain region being defined on the nitride channel layer, the gate region of the nitride channel layer having a non-planar structure transferred from the non-planar structure of the substrate; depositing a nitride barrier layer on the nitride channel layer, the nitride barrier layer having a non-planar structure located above and corresponding to the non-planar structure of the nitride channel layer, the nitride barrier layer and the nitride channel layer forming a nitride channel layer/nitride barrier layer heterojunction.