Vertical Thyristor With Segmented Fourth Region for Heat Dissipation
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Solution Overview
Problem
Existing thyristor structures face challenges in heat dissipation and turn-on speed due to the even distribution of hot spots around the central gate area, making it difficult to solder conductive wires effectively and limiting performance in terms of heat dissipation, turn-on speed, and maximum current handling.
Innovation Solution
A vertical thyristor design with a fourth semiconductor region interrupted in a continuous corridor extending from the gate area to the lateral edge, allowing for concentrated hot spots and improved soldering of conductive wires, which enhances heat dissipation and turn-on speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fourth semiconductor region is continuous around the gate area, then the thyristor structure is simpler and easier to manufacture, but heat dissipation is poor and turn-on speed is limited due to even distribution of hot spots
Solution Approach 1:
The fourth semiconductor region is segmented by introducing one or more continuous corridors that extend from the gate area toward the lateral edge. This segmentation creates distinct regions within the fourth layer, concentrating hot spots in specific areas rather than distributing them evenly, thereby improving turn-on speed while maintaining manufacturing feasibility.
Solution Approach 2:
The continuous corridors create local regions with different thermal and electrical properties. By concentrating hot spots in specific localized areas through the corridor structure, the thyristor achieves faster turn-on speed in those regions without requiring a complete redesign of the entire structure, thus balancing manufacturing ease with performance improvement.
2Ease of manufacture
If hot spots are evenly distributed around the gate area, then the structure is symmetric and easier to manufacture, but wire soldering becomes difficult and heat dissipation is limited
Solution Approach 1:
The continuous corridors segment the fourth semiconductor region, creating asymmetric hot spot concentration patterns. This segmentation provides specific localized areas that are easier to access and solder to, improving wire soldering ease while maintaining reasonable manufacturing complexity.
Solution Approach 2:
The introduction of continuous corridors breaks the symmetric distribution of hot spots around the gate area. This asymmetric structure creates preferential paths for current flow and heat dissipation, making wire soldering easier by providing concentrated access points rather than requiring soldering across an evenly distributed circular pattern.
3Productivity
If the fourth semiconductor region is interrupted in continuous corridors, then heat dissipation and turn-on speed improve, but the structure becomes more complex
Solution Approach 1:
The fourth semiconductor region is segmented by continuous corridors that extend from the gate area toward the lateral edge. This segmentation improves heat dissipation by creating concentrated hot spot regions and facilitating current flow paths, while the corridors themselves are simple geometric features that can be integrated into existing manufacturing processes with minimal added complexity.
4Productivity
If the fourth semiconductor region is interrupted in continuous corridors, then turn-on speed improves, but the active surface area increases
Solution Approach 1:
The continuous corridors extend in the lateral dimension from the gate area toward the lateral edge of the fourth region. By utilizing this lateral extension rather than increasing vertical thickness, the design achieves faster turn-on speed through hot spot concentration while minimizing the increase in active surface area, as the corridors are thin features embedded within the existing structure.
Data Source
AI summary
A thyristor is formed from a vertical stack of first, second, third, and fourth semiconductor regions of alternated conductivity types. The fourth semiconductor region is interrupted in a gate area of the thyristor. The fourth semiconductor region is further interrupted in a continuous corridor that extends longitudinally from the gate area towards an outer lateral edge of the fourth semiconductor region. A gate metal layer extends over the gate area of the thyristor. A cathode metal layer extends over the fourth semiconductor region but not over the continuous corridor.