Semiconductor Isolation Component for Parasitic PNPN Suppression
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Solution Overview
Problem
In semiconductor structures, particularly in switching regulators, the parasitic PNPN thyristor can turn on due to uncontrolled internal currents, leading to failure, especially when high-voltage and low-voltage MOSFETs are used in half-bridge circuits.
Innovation Solution
The introduction of an isolation component in the semiconductor substrate, which is doped to recombine carriers and extract them to an isolation electrode, effectively blocks the flow of carriers between high-voltage and low-voltage regions, preventing the activation of the parasitic PNPN thyristor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional isolation structures are used to block parasitic currents, then reliability is improved, but area is increased
Solution Approach 1:
The patent changes the electrical parameters of the isolation component by doping it with specific carrier concentrations and types (first doped region with first carrier concentration, second doped region with second carrier concentration). This parameter modification enables the isolation component to actively manage carrier flows through recombination and extraction mechanisms, achieving effective isolation in a compact area while preventing parasitic thyristor activation.
Solution Approach 2:
The isolation component acts as an intermediary structure between high-voltage and low-voltage regions. It includes a first doped region adjacent to the first region, a second doped region adjacent to the second region, and an isolation electrode. This intermediary structure recovers carriers through controlled recombination and extraction, effectively blocking parasitic current paths without requiring large isolation areas.
2Area of stationary object
If isolation component with carrier recombination and extraction is implemented, then area is reduced, but manufacturing complexity is increased
Solution Approach 1:
The isolation component is segmented into distinct functional regions: a first doped region with specific carrier concentration adjacent to the first region, a second doped region with different carrier concentration adjacent to the second region, and an isolation electrode. This segmentation allows each region to perform its specific function (carrier recombination or extraction) efficiently while simplifying the overall manufacturing process through modular construction.
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 solution significantly reduces the area required for isolation, minimizing the overall semiconductor structure area, and prevents uncontrolled internal currents, thereby enhancing the reliability and performance of the semiconductor structure.
Implementation Method 1
The isolation component can include a first doped region adjacent to the first region, a second doped region adjacent to the second region, and an isolation electrode. When first carriers flow through a first position of the isolation component along a direction from the first region to the second region, the first carriers can be recombined by the first doped region. When second carriers flow through a second position of the isolation component along a direction from the second region to the first region, the second carriers can be extracted to the isolation electrode.
Data Source
AI summary
A semiconductor structure can include: a semiconductor substrate having a first region, a second region, and an isolation region disposed between the first region and the second region; an isolation component located in the isolation region; and where the isolation component is configured to recombine first carriers flowing from the first region toward the second region, and to extract second carriers flowing from the second region toward the first region.