GaN HEMT Sidewall Insulating Structures for Ion Confinement
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Solution Overview
Problem
High electron mobility transistors (HEMTs) fabricated from GaN-based materials face a challenge where the insulating region formed by ion doping can lose its insulating effect due to ion activation during subsequent heating steps, leading to reduced yield and performance.
Innovation Solution
The formation of sidewall insulating structures on both sides of the doped region in the GaN and aluminum gallium nitride layers, which are created through ion doping and subsequent etching and filling with insulating material, effectively blocks ion escape and maintains the insulating effect even after heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ion doping is performed to form an insulating region in GaN-based HEMT, then the insulating effect is initially achieved, but during subsequent heating steps the ions become activated and dissipate to other regions, causing loss of insulating effect
Solution Approach 1:
The patent applies preliminary action by forming sidewall insulating structures on the sidewalls of the patterned structure before performing ion doping. These sidewall structures serve as barriers that prevent doped ions from migrating to unintended regions during subsequent heating steps, thus preserving the insulating effect without requiring re-doping
Solution Approach 2:
The sidewall insulating structures act as intermediary elements between the insulating doped region and the surrounding semiconductor material. These structures physically block ion migration paths, serving as a mediator that maintains ion confinement while allowing the heating process to proceed
2Ease of manufacture
If no sidewall insulating structures are formed, then the manufacturing process is simpler, but the ions dissipate during heating steps leading to reduced yield and performance
Solution Approach 1:
The sidewall insulating structures are formed in advance before ion doping, creating a pre-configured barrier system that prevents ion loss during subsequent processing. This preliminary structural preparation ensures high manufacturing yield without requiring complex post-doping corrections or rework steps
3Reliability
If sidewall insulating structures are formed to prevent ion dissipation, then the insulating effect is maintained during heating, but the manufacturing process becomes more complex with additional etching and filling steps
Solution Approach 1:
The sidewall insulating structures are formed as a preliminary step using standard semiconductor fabrication techniques (pattern definition, etching, and insulating layer deposition). While this adds process steps, it enables reliable ion confinement and eliminates the need for complex process adjustments or rework, achieving net process simplification through predictability
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
The sidewall insulating structures ensure the persistence of the insulating effect in the doped region, preventing ion dissipation and maintaining the integrity of the high electron mobility transistor's performance during subsequent processing steps.
Implementation Method 1
an ion doping step is performed to dope a plurality of ions in the gallium nitride layer and the aluminum gallium nitride layer
Implementation Method 2
the activated ions are blocked by the sidewall insulating structures, so that they are not easily dissipated to other places
Data Source
AI summary
A method of forming an insulating structure of a high electron mobility transistor (HEMT) is provided, the method including: forming a gallium nitride layer, forming an aluminum gallium nitride layer on the gallium nitride layer, performing an ion doping step to dope a plurality of ions in the gallium nitride layer and the aluminum gallium nitride layer, forming an insulating doped region in the gallium nitride layer and the aluminum gallium nitride layer, forming two grooves on both sides of the insulating doped region, and filling an insulating layer in the two grooves and forming two sidewall insulating structures respectively positioned at two sides of the insulating doped region.