Dual Gate Structure for Lower-Capacitance Semiconductor Switching
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Solution Overview
Problem
As semiconductor devices are scaled down to achieve higher packing density and performance, the challenge of reducing parasitic gate capacitance and improving switching times in silicon-based transistors remains, with existing technologies facing limitations in controlling the channel region and preventing source/drain punch through.
Innovation Solution
The implementation of dual gate structures, where a first gate is formed above the channel region and a second gate is formed above the drift region, electrically decoupled from the first, allowing for different voltage biases and reducing parasitic capacitance through self-aligned source/drain formation without additional fabrication steps or masking layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If device dimensions are scaled down to achieve higher packing density, then device footprint is reduced, but parasitic gate capacitance increases and switching times worsen
Solution Approach 1:
The gate structure is segmented into two separate gates: a first gate structure formed over the channel region and a second gate structure formed over the drift region. This segmentation allows independent control of the channel and drift regions, reducing parasitic capacitance between the gate and drain while maintaining compact device dimensions suitable for high packing density.
2Area of stationary object
If device dimensions are scaled down to achieve higher packing density, then device footprint is reduced, but switching times increase
Solution Approach 1:
The gate structure is segmented into two separate gates: a first gate structure formed over the channel region and a second gate structure formed over the drift region. This segmentation allows independent control of the channel and drift regions, reducing parasitic capacitance between the gate and drain while maintaining compact device dimensions suitable for high packing density.
3Device complexity
If single gate structure is used, then device structure is simpler, but control of channel region and prevention of source/drain punch through is insufficient
Solution Approach 1:
The gate structure is segmented into two separate gates: a first gate structure formed over the channel region and a second gate structure formed over the drift region. This segmentation allows independent control of the channel and drift regions, reducing parasitic capacitance between the gate and drain while maintaining compact device dimensions suitable for high packing density.
Solution Approach 2:
Different gate structures are applied to different regions: the first gate structure is optimized for channel control while the second gate structure is optimized for drift region control and punch-through prevention. This local differentiation allows each gate to be specifically tailored to its functional requirements, improving overall device reliability.
Data Source
AI summary
The present disclosure describes a semiconductor structure that includes a channel region, a source region adjacent to the channel region, a drain region, a drift region adjacent to the drain region, and a dual gate structure. The dual gate structure includes a first gate structure over portions of the channel region and portions of the drift region. The dual gate structure also includes a second gate structure over the drift region.