FinFET Conformal Layer Vertical Sidewalls Strain Control
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Solution Overview
Problem
Conventional FinFET devices face challenges in achieving uniform gate control and strain, leading to variations in electrical behavior and increased complexity in three-dimensional transistor architectures.
Innovation Solution
The implementation of a FinFET device with a conformal layer having vertical sidewalls parallel to the gate area, which provides uniform gate control and strain, and is formed using techniques like chemical vapor deposition or atomic layer deposition, allowing for a lightly-doped semiconductor material that inhibits out-diffusion and offers tensile or compressive stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional FinFET devices are used, then device size can be shrunk, but uniform gate control and strain are difficult to achieve
Solution Approach 1:
The device is divided into distinct structural segments: a fin region with the channel, source/drain regions at opposite ends, and a conformal layer that segments the space between source/drain regions. This segmentation allows independent optimization of gate control in the fin region while maintaining strain in the channel region, resolving the contradiction between device shrinkage and uniform control.
Solution Approach 2:
Different regions of the device are given different properties: the fin region provides gate control, the source/drain regions provide electrical contacts, and the conformal layer with vertical sidewalls provides localized strain and mobility enhancement in the channel region. This local differentiation allows each region to optimize its function without compromising overall device performance.
2Area of moving object
If three-dimensional transistor architectures are implemented, then areal density improves, but device-to-device variation increases
Solution Approach 1:
The conformal layer is designed with specific geometric parameters (vertical sidewalls, controlled thickness) that can be precisely controlled during fabrication. By changing and optimizing these parameters, the device achieves consistent electrical characteristics across multiple devices, reducing variation while maintaining high areal density through the three-dimensional architecture.
3Reliability
If mobility enhancement is achieved through strain, then electrical performance improves, but gate oxide damage increases
Solution Approach 1:
The conformal layer acts as an intermediary structure that introduces strain to the channel region through its vertical sidewalls, enhancing carrier mobility without requiring direct mechanical stress on the gate oxide. This mediator approach allows mobility enhancement while protecting the gate oxide from damage that would occur with more aggressive strain introduction methods.
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 configuration enhances mobility, reduces device-to-device variation, and minimizes gate oxide damage, resulting in improved performance and reliability of FinFET devices.
Implementation Method 1
a first conformal layer formed around an embedded portion of the source/drain region, the first conformal layer including a vertical sidewall oriented parallel to the gate area
Data Source
AI summary
An integrated circuit device includes a fin having a gate area beneath a gate electrode structure, a source/drain region disposed beyond ends of the fin, and a first conformal layer formed around an embedded portion of the source/drain region. A vertical sidewall of the first conformal layer is oriented parallel to the gate area.