Temperature-Compensated Gate Resistance in Power Semiconductors
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Solution Overview
Problem
The resistance of gate resistors in power semiconductor devices varies significantly with temperature changes, affecting device performance.
Innovation Solution
Implementing gate structures with different materials and doping levels to create sections with varying resistance temperature coefficients, such as using SiCr for lumped gate resistors and polysilicon for gate electrodes, to compensate for temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate resistors are made from conventional materials with single resistance temperature coefficient, then device performance is simplified, but resistance variation with temperature exceeds 6% per 100°C
Solution Approach 1:
The gate structure is divided into multiple sections with different materials and doping levels, where each section has a different resistance temperature coefficient. This local differentiation allows the overall gate resistance to be temperature compensated, reducing variation from conventional levels to less than 6% per 100°C while maintaining reliable device performance.
Solution Approach 2:
The gate structure employs composite materials including polysilicon with different doping levels and other semiconductor materials, creating a multi-material system where the combined resistance temperature coefficients achieve temperature compensation. This composite approach reduces gate resistance variation while maintaining electrical performance stability across temperature ranges.
2Ease of manufacture
If gate structure uses uniform material composition, then manufacturing process is simpler, but resistance temperature coefficient variation is insufficient for compensation
Solution Approach 1:
The gate structure is segmented into multiple regions with distinct material compositions and doping levels, allowing each segment to contribute differently to the overall resistance temperature coefficient. This segmentation enables temperature compensation capability while using standard semiconductor fabrication processes for each individual segment.
Solution Approach 2:
The invention changes material parameters including doping levels, material composition, and geometric dimensions of different gate sections to achieve desired resistance temperature coefficients. These parameter variations enable temperature compensation while remaining compatible with conventional semiconductor manufacturing processes.
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
Reduces overall resistance variation by less than 6% per 100°C, enhancing device performance and stability across temperature ranges.
Implementation Method 1
The high resistance portion of the gate structure comprises a first section that has a first resistance temperature coefficient and a second section that has a second resistance temperature coefficient that differs from the first resistance temperature coefficient
Data Source
AI summary
Semiconductor devices comprise a semiconductor layer structure and a gate structure that comprises a high resistance portion and a low-resistance portion on the semiconductor layer structure. The high resistance portion of the gate structure comprises a first section that has a first resistance temperature coefficient and a second section that has a second resistance temperature coefficient that differs from the first resistance temperature coefficient.