Vertical GaN Power Device Breakdown Voltage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power electronics face challenges in achieving uniform voltage breakdown and reducing edge breakdown in semiconductor devices, leading to heating and performance deterioration due to field crowding at the edges of devices.
Innovation Solution
The implementation of a controlled breakdown region in vertical GaN power devices, achieved through ion implantation and doping techniques, allows for controlled breakdown voltage distribution, ensuring that breakdown occurs within the device region rather than at the edges, thereby reducing heating and improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power electronic devices are used without controlled breakdown regions, then the device structure is simple, but breakdown current concentrates at the edges causing heating and performance deterioration
Solution Approach 1:
The patent introduces controlled breakdown regions with specific doping concentrations (e.g., 1e16 to 1e18 atoms/cm³) at predetermined locations within the semiconductor device. These regions have locally modified electrical properties compared to the bulk material, creating spatially varying breakdown characteristics that prevent edge concentration of breakdown current while maintaining overall device functionality.
Solution Approach 2:
The patent divides the semiconductor device into distinct regions: controlled breakdown regions with specific doping concentrations and bulk regions with different doping concentrations. This segmentation allows independent optimization of breakdown characteristics in different areas, distributing the breakdown current uniformly across multiple controlled regions rather than concentrating it at edges.
2Manufacturing precision
If ion implantation is used to create controlled breakdown regions, then breakdown voltage can be controlled and distributed, but the manufacturing process becomes more complex
Solution Approach 1:
The patent performs ion implantation during the epitaxial growth process to pre-establish controlled breakdown regions with precise doping concentrations before device fabrication begins. This preliminary doping action defines the breakdown characteristics early in the manufacturing process, allowing subsequent fabrication steps to proceed with standard procedures while inheriting the pre-configured breakdown control.
Solution Approach 2:
The patent utilizes ion implantation to precisely control doping concentration parameters (e.g., 1e16 to 1e18 atoms/cm³) in controlled breakdown regions. By adjusting implantation energy, dose, and distribution profiles, the breakdown voltage in these regions can be precisely tuned to achieve uniform breakdown characteristics without requiring complex post-processing adjustments.
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 effectively spreads breakdown current through the main device junction, reducing edge breakdown and enhancing the operational efficiency and reliability of semiconductor devices by allowing them to operate closer to their parallel plane breakdown voltage.
Implementation Method 1
implanting ions through the second GaN material and into a first portion of the first GaN material to increase a doping concentration of the first conductivity type
Data Source
AI summary
A method for fabricating a vertical GaN power device includes providing a first GaN material having a first conductivity type and forming a second GaN material having a second conductivity type and coupled to the first GaN material to create a junction. The method further includes implanting ions through the second GaN material and into a first portion of the first GaN material to increase a doping concentration of the first conductivity type. The first portion of the junction is characterized by a reduced breakdown voltage relative to a breakdown voltage of a second portion of the junction.