High-Voltage Semiconductor Layout for Lower Capacitance Switching
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Solution Overview
Problem
High-voltage semiconductor devices face challenges in signal transmission due to the increased effective capacitance of the active element region, which limits transmission frequency, especially in gate driver circuits with high-voltage semiconductor elements.
Innovation Solution
The semiconductor device incorporates a high-voltage semiconductor element with a first doped region laterally surrounding a central portion, forming an auxiliary junction, and a drift region extending between the doped regions to reduce the effective capacitance of the active element region, thereby increasing transmission speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radius of the inner curvature of the drift zone is increased to prevent premature breakdown, then the area of the first element region increases, but the effective capacitance increases which limits transmission frequency
Solution Approach 1:
The first element region is segmented into an active element region and an inactive central portion. The drift zone laterally surrounds only the active element region, not the entire first element region. This segmentation allows the active region to have sufficient area for high breakdown voltage while the inactive portion does not contribute to effective capacitance, thus resolving the contradiction between reliability and speed.
2Reliability
If the area of the first element region is increased to improve breakdown characteristics, then the effective capacitance increases, but the transmission speed decreases
Solution Approach 1:
The drift zone is positioned to laterally surround only the active element region, creating a local quality distinction between the active and inactive portions. This allows the active region to have optimized area for breakdown characteristics while the inactive central portion does not contribute to the effective capacitance that limits transmission speed.
Data Source
AI summary
A semiconductor device includes a high-voltage semiconductor element with a first doped region of a first conductivity type. The first doped region at least partly laterally surrounds a central portion. The central portion and the first doped region may form an auxiliary junction. A second doped region of a second conductivity type at least partly laterally surrounds the first doped region. A drift region of the first or second conductivity type extends from the first doped region to the second doped region, and forms a first pn junction with the first doped region or the second doped region.