Semiconductor Protection Region Connection for Voltage Withstand
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Solution Overview
Problem
Semiconductor devices face challenges in enhancing voltage withstand performance without increasing the device size, particularly due to the need for a protection region of a different conductivity type that requires additional area for connection, leading to increased element size.
Innovation Solution
A semiconductor device design that includes a substrate, drift region, well region, source region, gate groove, drain region, gate electrode, protection region, and connection region, where the protection region is of a second conductivity type and has the same potential as the source region, allowing for improved voltage withstand performance without increasing the device size by eliminating the need for additional connection area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection region is formed to improve voltage withstand performance, then voltage withstand performance is improved, but device size increases due to additional connection area requirements
Solution Approach 1:
The connection region merges the protection region and well region into a single continuous doped region, eliminating the need for separate metal wiring connections to the protection region. This integration allows the protection region to be electrically connected to the source potential without requiring additional surface area for contact holes and metal traces, thereby improving voltage withstand performance while maintaining compact device dimensions.
Solution Approach 2:
The connection region extends vertically into the drift region to establish electrical connection between the protection region and well region, rather than relying solely on horizontal surface connections. This vertical extension through the drift region depth allows electrical connectivity without increasing the device footprint on the surface plane.
2Reliability
If metal wiring is connected to the protection region via contact hole, then electrical connection is achieved, but element size increases due to additional connection area
Solution Approach 1:
The connection region combines the protection region and well region into one continuous doped structure, eliminating the need for separate metal wiring and contact holes to connect the protection region to the source. This merger achieves electrical connection through the doped region continuity itself, removing the additional connection infrastructure that would increase element size.
Solution Approach 2:
The connection region serves dual purposes: it provides the protection function by being a doped region of the second conductivity type, and simultaneously provides the electrical connection function by extending to contact the well region. This self-service approach eliminates the need for separate connection structures, achieving both protection and connectivity within the same region without increasing element size.
Data Source
AI summary
A semiconductor device includes: a substrate; a drift region formed on a main surface of the substrate; a well region formed in a main surface of the drift region; a source region formed in the well region; a gate groove formed from the main surface of the drift region in a perpendicular direction while being in contact with the source region, the well region, and the drift region; a drain region formed in the main surface of the drift region; a gate electrode formed on a surface of the gate groove with a gate insulating film interposed therebetween; a protection region formed on a surface of the gate insulating film facing the drain region; and a connection region formed in contact with the well region and the protection region.