GaN Nitride Semiconductor Device With Channel Blocking Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Silicon-based power switching devices in power converting systems face limitations in efficiency due to their material constraints, leading to challenges in maintaining a normally OFF state and uniform ON resistance, which affects power consumption and reproducibility.
Innovation Solution
A nitride-based semiconductor device is developed, featuring a substrate with a GaN-containing layer, a nitride-containing layer, a channel blocking layer with negative charges, and insulation layers, which blocks the channel below the gate electrode to maintain a normally OFF state and ensure uniform ON resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silicon-based power switching devices are used, then the device structure can be relatively simple, but the efficiency and power management are limited due to material constraints
Solution Approach 1:
The patent changes the material parameters from silicon-based to nitride-based semiconductor materials, specifically using GaN (gallium nitride) as the channel layer and AlGaN (aluminum gallium nitride) as the barrier layer. This material parameter change enables higher electron mobility and better power efficiency while maintaining device functionality
Solution Approach 2:
The invention employs composite material structure with multiple layers including GaN channel layer, AlGaN barrier layer, and nitride-based semiconductor layers. This composite structure combines the advantages of different materials to achieve both high efficiency and controlled electrical characteristics
2Ease of manufacture
If conventional silicon-based devices are used, then manufacturing processes are established, but maintaining a normally OFF state and uniform ON resistance is challenging
Solution Approach 1:
The patent introduces a channel blocking layer with specific local properties (nitride-based semiconductor with controlled composition) that creates localized charge distribution. This local quality modification ensures uniform ON resistance across the device by controlling the electrical characteristics in specific regions of the semiconductor structure
Solution Approach 2:
The invention changes the compositional parameters of the semiconductor layers, using AlxGa1-xN with controlled aluminum content and GaN layers with specific thickness and doping levels. These parameter changes enable precise control over ON resistance uniformity while maintaining compatibility with manufacturing processes
3Loss of energy
If nitride-based semiconductor layers are added to achieve normally OFF state, then efficiency and uniformity improve, but device structure becomes more complex
Solution Approach 1:
The patent segments the semiconductor device into distinct functional layers: GaN channel layer, AlGaN barrier layer, nitride-based channel blocking layer, and gate structure. This segmentation allows each layer to perform its specific function efficiently, achieving normally OFF state and uniform ON resistance while keeping the overall structure organized and manufacturable
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 nitride-based semiconductor device achieves improved process simplification and reproducibility while maintaining uniform ON resistance and threshold voltage, enhancing the efficiency and power management in power converting systems.
Implementation Method 1
The channel blocking layer may have negative (−) charges and may block a channel below the gate electrode via charge neutrality
Data Source
AI summary
A nitride-based semiconductor device including a substrate; a GaN-containing layer on the substrate; a nitride-containing layer on the GaN layer; a channel blocking layer on the nitride-containing layer, the channel blocking layer including a nitride-based semiconductor; a gate insulation layer on the channel blocking layer; and a gate electrode on the gate insulation layer.