SiC Semiconductor Layer Structure for Stable High Threshold Voltage
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Solution Overview
Problem
Existing semiconductor devices face challenges in achieving stable high threshold voltage and high carrier mobility with complex processes, particularly in devices using SiC, where maintaining high heat dissipation and low on-resistance is difficult.
Innovation Solution
A semiconductor device design incorporating a SiC first layer, an AlxInyGa1-x-yN second layer, and an AlzGa1-zN third layer, with specific partial regions and insulating members, allows for controlled polarization and carrier region formation without the need for a recess type gate electrode or impurity doping, enabling simple process stability and high threshold voltage attainment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recess type gate electrode or impurity doping is used to achieve high threshold voltage, then the threshold voltage can be increased, but the manufacturing process becomes complex
Solution Approach 1:
The patent changes the material composition parameter of the semiconductor layer, specifically incorporating aluminum nitride (AlN) or aluminum gallium nitride (AlGaN) with controlled composition ratios. By adjusting the aluminum content and layer thickness, the threshold voltage is controlled through material parameter optimization rather than complex structural modifications like recess gates or impurity doping, thus achieving high threshold voltage with simpler manufacturing processes
Solution Approach 2:
The patent employs composite material structures by combining different semiconductor layers with distinct compositions - specifically a first semiconductor layer containing AlN or AlGaN and a second semiconductor layer with different composition ratios. This composite approach enables independent optimization of threshold voltage and carrier mobility through material composition design, avoiding the need for complex single-structure solutions
2Reliability
If complex processes are used to achieve high threshold voltage, then threshold voltage stability improves, but manufacturing simplicity deteriorates
Solution Approach 1:
The invention optimizes manufacturing simplicity by changing material composition parameters instead of process complexity. Specifically, controlling the aluminum nitride content and layer thickness in the first semiconductor layer provides a straightforward parameter-based approach to achieving stable threshold voltage, eliminating the need for complex multi-step processes like recess formation or precise impurity doping
Solution Approach 2:
The composite semiconductor layer structure simplifies manufacturing by enabling threshold voltage control through material composition rather than complex fabrication steps. The first semiconductor layer with AlN or AlGaN and the second semiconductor layer with controlled composition ratios work together to provide stable threshold voltage through inherent material properties, making the manufacturing process more straightforward and easier to control
3Temperature
If SiC is used for high heat dissipation, then thermal performance improves, but achieving high carrier mobility and low on-resistance becomes difficult
Solution Approach 1:
The patent employs a composite semiconductor layer structure where the first layer (containing AlN or AlGaN) and second layer (with controlled composition) work synergistically. This composite approach enables simultaneous optimization of carrier mobility and low on-resistance while maintaining the high heat dissipation capability of SiC-based materials, overcoming the limitations of single-material systems
Solution Approach 2:
The invention applies local quality by creating distinct semiconductor layers with different compositions and properties at specific locations within the device structure. The first semiconductor layer with AlN or AlGaN provides localized control over carrier concentration and mobility, while the overall SiC-based structure maintains high heat dissipation, achieving both thermal performance and electrical characteristics through spatially differentiated material properties
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 design achieves stable high threshold voltage, high carrier mobility, and low on-resistance with improved operating characteristics, including high heat dissipation, by locally providing the second layer and controlling carrier region formation, thus simplifying the manufacturing process.
Implementation Method 1
allows for controlled polarization and carrier region formation
Implementation Method 2
iC, where maintaining high heat dissipation and low on-resistance is difficult
Data Source
AI summary
According to one embodiment, a semiconductor device, includes first to third electrodes, first to third layers, and an insulating member. A position of the third electrode is between a position of the first electrode and a position of the second electrode. The first layer includes first to fifth partial regions. The fourth partial region is located between the first and third partial regions. The fifth partial region is located between the third and second partial regions. The second layer includes a first compound region provided between the third partial region and the third electrode. The third layer includes first to third portions. The third portion is located between the third partial region and the first compound region. The insulating member includes a first insulating region. The first insulating region is located between the first compound region and the third electrode.