Quasi-Superjunction JFET Layout for Higher Breakdown Voltage
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Solution Overview
Problem
The increasing complexity and power dissipation in semiconductor integrated circuits (ICs) due to scaling down processes necessitate advancements in IC processing and manufacturing to maintain efficiency and reduce costs, particularly in high-voltage applications.
Innovation Solution
The integration of a quasi super junction structure and a conductive plate in a junction field effect transistor (JFET) to enhance breakdown voltage, combined with a synchronous rectifier and transformer circuit design for efficient power conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scaling down process is used to increase functional density, then production efficiency increases and costs decrease, but power dissipation increases
Solution Approach 1:
The drift region is segmented into multiple alternating n-type and p-type columns forming a quasi-superjunction structure. This segmentation allows for better electric field distribution and reduced power dissipation while maintaining high functional density in scaled-down devices.
Solution Approach 2:
Different regions of the device are given different doping types and concentrations to optimize local electric field management. The alternating n-type and p-type columns create localized charge regions that reduce overall power dissipation in the scaled-down structure.
2Productivity
If geometry size is decreased to increase functional density, then more devices fit per chip area, but breakdown voltage decreases due to high electrical fields
Solution Approach 1:
The drift region is divided into alternating n-type and p-type columns, creating a quasi-superjunction structure that segments the electric field paths. This segmentation maintains high breakdown voltage even when overall device geometry is scaled down to increase functional density.
Solution Approach 2:
The alternating doped columns act as intermediary charge regions that mediate the electric field distribution. These intermediary regions prevent direct high-field paths, maintaining breakdown voltage in scaled-down geometries.
3Reliability
If quasi super junction structure is implemented to increase breakdown voltage, then device reliability improves, but manufacturing complexity increases
Solution Approach 1:
While segmentation into alternating columns increases structural complexity, it is implemented through standard semiconductor fabrication techniques (ion implantation or in-situ doping), making the complexity manageable in terms of manufacturing processes.
Solution Approach 2:
The quasi-superjunction structure is achieved by changing doping parameters (type, concentration, depth) in alternating columns. These parameter changes are implemented through controlled fabrication processes, balancing structural complexity with manufacturing feasibility.
Data Source
AI summary
An integrated circuit includes a substrate. The substrate includes a p-type substrate region, a first n-type region over the p-type substrate region, a second n-type region over the p-type substrate region, a first p-type epitaxial region over the p-type substrate region and between the first and second n-type regions, wherein in a top view the first p-type epitaxial region has a ring-shape top profile, and a p-type doped region within the second n-type region. An isolation structure is over the p-type substrate region, wherein in a cross-sectional view the first p-type epitaxial region extends from a top surface of the p-type substrate region to a bottom surface of the isolation structure. A drain electrode is electrically coupled to the first n-type region. A gate electrode electrically coupled to the p-type doped region. A source electrode is electrically coupled to the second n-type region.