SiC-Backed Gallium Oxide Schottky Diode for High-Voltage Thermal Limits
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Solution Overview
Problem
High power semiconductor devices operating at high voltages face limitations in widespread acceptance due to challenges in achieving optimal performance and efficiency, particularly with beta-phase Gallium Oxide (β-Ga2O3) diodes, which suffer from poor thermal conductivity and complex thermal management requirements.
Innovation Solution
A multilayered semiconductor diode device is developed, featuring a silicon carbide (SiC) substrate with an epitaxial transition layer and an epitaxial drift layer of semiconductor oxide materials, forming a Schottky barrier junction with a metal layer, which enhances breakdown voltage and reduces ON-state resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If beta-phase Gallium Oxide (β-Ga2O3) is used for high power Schottky diodes, then breakdown voltage capability is improved, but thermal conductivity deteriorates leading to complex thermal management requirements
Solution Approach 1:
The patent employs a composite material structure combining β-Ga2O3 drift layer (for high breakdown voltage) with SiC substrate (for superior thermal conductivity). This heterostructure allows the device to achieve both high voltage blocking capability and effective heat dissipation, resolving the contradiction between electrical performance and thermal management.
Solution Approach 2:
The SiC substrate acts as an intermediary thermal management layer between the β-Ga2O3 active region and the heat sink. It provides a high thermal conductivity pathway that efficiently conducts heat away from the diode junction, enabling thermal management without compromising the electrical characteristics of the Ga2O3 device.
2Strength
If wider bandgap semiconductor materials are used, then blocking voltage capability is improved, but manufacturing complexity increases
Solution Approach 1:
The SiC substrate serves as a manufacturable platform that simplifies the fabrication of β-Ga2O3 devices. SiC's well-established manufacturing processes and compatibility with standard semiconductor fabrication techniques provide a robust foundation for growing high-quality Ga2O3 layers, thereby reducing overall device manufacturing complexity despite using advanced wide bandgap materials.
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 solution enables high dielectric breakdown voltages and reduced ON-resistance, improving the power density and efficiency of high power semiconductor devices while simplifying thermal management, thus addressing the limitations of existing technologies.
Implementation Method 1
a metal layer above the epitaxial drift layer, wherein the metal layer and the epitaxial drift layer form a Schottky barrier junction
Data Source
AI summary
In some embodiments, the techniques described herein relate to a multilayered semiconductor diode device including: a substrate including silicon carbide (SiC); an epitaxial transition layer including a first semiconductor oxide material or SiC, wherein the epitaxial transition layer is on the substrate; an epitaxial drift layer including a second semiconductor oxide material, wherein the epitaxial drift layer is on the epitaxial transition layer; and a metal layer above the epitaxial drift layer, wherein the metal layer and the epitaxial drift layer form a Schottky barrier junction. In some embodiments, a method of forming a multilayered semiconductor diode device includes: providing a substrate including silicon carbide (SiC); forming an epitaxial transition layer including a first semiconductor oxide material or SiC; forming an epitaxial drift layer including a second semiconductor oxide material; and forming a metal layer above the epitaxial drift layer forming a Schottky barrier junction.