Snake-Shaped Gate Structure for SOI Semiconductor Devices
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Solution Overview
Problem
In semiconductor devices with a silicon on insulator (SOI) structure, excessive dopant diffusion into the gate can degrade performance, and existing designs struggle to balance dopant distribution to prevent interference with the working region while maintaining device size constraints.
Innovation Solution
The semiconductor device features a gate structure with a lateral portion having a snake shape and multiple bending portions, increasing the dopant diffusion path length and reducing interference with the working region, thereby enhancing performance without increasing the device's size or resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dopant is applied to the gate structure, then the gate can be doped to improve performance, but excessive dopant diffusion into the working region degrades device performance
Solution Approach 1:
The lateral portion of the gate structure is designed with a snake shape including multiple bending portions instead of a straight configuration. This curved path increases the dopant diffusion path length, allowing controlled doping of the gate while preventing excessive dopant from reaching the working region, thus resolving the contradiction between achieving gate doping benefits and avoiding harmful dopant diffusion
Solution Approach 2:
The gate structure transitions from a simple linear configuration to a three-dimensional snake shape with multiple bends. This dimensional complexity increases the effective path length for dopant diffusion without increasing the projected area, enabling the gate to achieve both doping functionality and protection from excessive dopant diffusion
2Area of stationary object
If the device size is reduced, then integration density increases, but the dopant diffusion path becomes shorter causing excessive dopant interference
Solution Approach 1:
The snake-shaped lateral portion with multiple bending portions creates a longer dopant diffusion path within a compact area. The curved configuration allows the dopant to travel a longer distance to reach the working region, effectively reducing dopant interference even when the overall device area is minimized for high integration density
Solution Approach 2:
By transforming the gate structure into a three-dimensional snake shape, the patent achieves a longer dopant diffusion path without proportionally increasing the device footprint. This dimensional approach allows compact device design while maintaining sufficient dopant diffusion path length to prevent harmful interference
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 design effectively reduces dopant concentration in the gate's working region, improving semiconductor device performance by extending the dopant diffusion path and minimizing interference, while maintaining the original circuit layout's area and resistance.
Implementation Method 1
the length of the path for the dopant to diffuse into the gate structure can be increased, so that a rapid diffusion of the dopant having a high concentration into the working region of the gate structure can be avoided
Data Source
AI summary
A semiconductor device includes a substrate; an active layer disposed over the substrate and having a source region and a drain region; a contact region disposed over the substrate; a gate structure disposed over the active layer, wherein the gate structure includes a middle portion and a lateral portion connecting to the middle portion, and the lateral portion has a snake shape.