In-Situ Etch and Regrowth for GaN Device Leakage Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power electronics face challenges in achieving reliable and reproducible fabrication processes for III-nitride semiconductor devices, particularly in forming high-quality regrowth interfaces and reducing leakage in GaN-based diodes and transistors.
Innovation Solution
The use of in-situ etch and regrowth processes, involving a masking layer and patterning to expose regrowth regions, allows for the formation of III-nitride material with improved interfaces and conductivity types, enabling the fabrication of devices like MPS diodes and VJFETs with reduced leakage and enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fabrication processes are used for III-nitride devices, then manufacturing simplicity is maintained, but regrowth interface quality deteriorates and leakage increases
Solution Approach 1:
The patent combines the etching and regrowth processes into a single continuous in-situ operation within the epitaxial reactor. The etch mask is patterned, then etching and regrowth are performed sequentially without breaking vacuum or exposing the structure to external environment, merging two separate process steps into one integrated flow that improves interface quality while maintaining manufacturing efficiency
Solution Approach 2:
The patent introduces an in-situ etch mask as an intermediary element that enables precise definition of regrowth regions. The mask layer is deposited, patterned, and used to guide the etching process, then removed after regrowth. This intermediary facilitates controlled material removal and selective regrowth, achieving high interface quality through a systematic approach
2Reliability
If in-situ etch and regrowth processes are used, then regrowth interface quality and device reliability are improved, but fabrication process complexity increases
Solution Approach 1:
The patent maintains continuous operation within the epitaxial reactor by performing etching and regrowth without interrupting the vacuum environment or exposing the structure to external contamination. The process flows continuously from mask patterning through etching to regrowth, eliminating idle time and maintaining controlled conditions throughout, thereby improving reliability without proportionally increasing complexity
Solution Approach 2:
The patent utilizes changes in process parameters (temperature, pressure, gas composition) to transition between etching and regrowth modes within the same reactor. By adjusting these parameters, the system can perform material removal followed by material deposition without physical intervention, managing process complexity through parameter control rather than additional equipment
3Ease of manufacture
If conventional etching methods are used, then process simplicity is maintained, but leakage in GaN-based devices increases
Solution Approach 1:
The patent converts the potential harm of exposed regrowth interfaces (which could lead to leakage) into a benefit by performing regrowth in-situ under controlled conditions. The continuous process ensures that interfaces are formed in a clean, controlled environment rather than exposed to contamination, turning what could be a leakage source into a high-quality interface that reduces device leakage
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
This approach results in more reproducible and high-yield fabrication processes for electronic devices, improving the reliability and performance of III-nitride semiconductor devices by forming high-quality regrowth interfaces and reducing leakage, thereby enhancing the overall efficiency and reliability of power electronics.
Implementation Method 1
removing, using an in-situ etch, a portion of the III-nitride structure to expose a regrowth region
Implementation Method 2
regrowing a III-nitride material in the regrowth region
Data Source
AI summary
A method of regrowing material includes providing a III-nitride structure including a masking layer and patterning the masking layer to form an etch mask. The method also includes removing, using an in-situ etch, a portion of the III-nitride structure to expose a regrowth region and regrowing a III-nitride material in the regrowth region.