Nitrogen-Face GaN Regrowth via Plasma Treatment
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Solution Overview
Problem
Current methods fail to effectively produce high electron mobility transistor (HEMT) devices with N-face polarity gallium nitride due to difficulties in growing gallium nitride with this polarity, leading to radio frequency dispersion issues and reduced efficiency in radio frequency operation.
Innovation Solution
A method involving a gallium nitride template with a nitrogen-face polarity substrate and layers, where gallium nitride is regrown to form a second nitrogen-face polarity layer, followed by the growth of a barrier and channel layer, eliminating donor-like trap states and radio frequency dispersion by controlling impurities at the regrowth interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to grow gallium nitride, then Ga-face polarity structures can be obtained, but N-face polarity gallium nitride cannot be effectively produced
Solution Approach 1:
The method performs preliminary actions by first forming a Ga-face polarity template layer, then performing in-situ plasma treatment to modify the surface before regrowth. This preliminary preparation enables the subsequent N-face polarity regrowth to occur successfully, resolving the difficulty of directly growing N-face polarity gallium nitride.
Solution Approach 2:
The invention changes the polarity parameter through in-situ plasma treatment, which modifies the surface properties of the template layer. By controlling plasma treatment parameters (power, time, gas flow), the method transforms the growth conditions to enable N-face polarity orientation, achieving precise polarity control.
2Reliability
If N-face polarity gallium nitride is grown without proper process control, then radio frequency dispersion occurs, but with proper process control production complexity increases
Solution Approach 1:
The method employs in-situ plasma treatment and continuous regrowth without breaking vacuum, maintaining continuous useful action throughout the process. This continuity prevents contamination and donor-like trap state formation at interfaces, eliminating radio frequency dispersion while keeping process control manageable through automation.
Solution Approach 2:
Plasma serves as an intermediary that modifies the template layer surface properties, creating optimal conditions for N-face polarity regrowth. This intermediary treatment eliminates harmful donor-like trap states at the interface, ensuring reliable radio frequency performance without requiring overly complex process controls.
3Reliability
If donor-like trap states are present at the regrowth interface, then radio frequency dispersion occurs, but eliminating them requires additional process steps
Solution Approach 1:
The method converts the potentially harmful interface between template and regrown layer into a beneficial structure by using in-situ plasma treatment. This treatment passivates the interface, preventing donor-like trap state formation and eliminating radio frequency dispersion, while maintaining production efficiency through the integrated one-step process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simple growth of nitrogen-face polarity gallium nitride, effectively eliminating radio frequency dispersion and facilitating large-scale production of N-face polarity gallium nitride epitaxial structures with improved efficiency.
Implementation Method 1
performing in-situ plasma treatment to modify a surface of the template layer
Implementation Method 2
a first nitrogen-face polarity gallium nitride layer positioned on the substrate; re-growing gallium nitride on a surface of the first nitrogen-face polarity gallium nitride layer to form a second nitrogen-face polarity gallium nitride layer
Data Source
AI summary
The present invention relates to a method for manufacturing a nitrogen-face polarity gallium nitride epitaxial structure, which includes: providing a gallium nitride template which includes a substrate and a first nitrogen-face polarity gallium nitride layer positioned on the substrate; re-growing the gallium nitride on a surface of the first nitrogen-face polarity gallium nitride layer to form a second nitrogen-face polarity gallium nitride layer; and sequentially growing a barrier layer and a channel layer on the second nitrogen-face polarity gallium nitride layer. The method for manufacturing the nitrogen-face polarity gallium nitride epitaxial structure provided by the present application enables a simple growth of the nitrogen-face polarity gallium nitride, can effectively eliminate the radio frequency dispersion phenomenon, and is beneficial to large-scale production and utilization of the nitrogen-face polarity gallium nitride epitaxial structure.