Nanostructure Gate Dielectric Layout for Threshold and Mobility Tuning
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Solution Overview
Problem
As semiconductor devices undergo miniaturization, challenges arise in maintaining device performance due to reduced feature sizes, including interference between dipole elements and fluorine atoms in gate dielectric layers, which affect threshold voltage tuning and mobility.
Innovation Solution
A two-step process is employed to introduce dipole elements and fluorine atoms into the gate dielectric layer, reducing overlapping regions and allowing for independent tuning of threshold voltages and improved mobility by passivating oxygen vacancies and reducing silicon dangling bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dipole elements and fluorine atoms are introduced into the gate dielectric layer simultaneously, then threshold voltage tuning and mobility improvement are achieved, but interference between dipole elements and fluorine atoms occurs
Solution Approach 1:
The gate dielectric layer is divided into multiple regions: a first region containing dipole elements for threshold voltage tuning, a second region containing fluorine atoms for mobility improvement, and a third region containing both elements. This segmentation allows independent optimization of each element's function while minimizing interference through spatial separation.
Solution Approach 2:
Different regions of the gate dielectric layer are assigned different compositions and properties: the first region is optimized for threshold voltage control with dipole elements, the second region is optimized for carrier mobility with fluorine atoms, and the third region provides combined functionality. This local quality approach allows each region to perform its specific function optimally without mutual interference.
2Productivity
If feature sizes are reduced to increase integration density, then more components can be integrated into a given area, but device performance maintenance becomes difficult
Solution Approach 1:
The gate dielectric layer is structured with different regions having different properties: dipole-rich regions for threshold voltage control, fluorine-rich regions for mobility enhancement, and combined regions. This allows performance optimization at the local level even as overall device dimensions are reduced, maintaining device performance while enabling higher integration density.
Solution Approach 2:
The gate dielectric layer is formed as a composite structure containing both dipole elements and fluorine atoms in different spatial distributions. This composite approach combines the benefits of threshold voltage tuning and mobility improvement in a single integrated structure, allowing performance maintenance at reduced feature sizes.
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 approach enables semiconductor devices to achieve desired threshold voltages and enhanced mobility by controlling the distribution of fluorine and dipole elements, minimizing interference and optimizing performance.
Implementation Method 1
improved mobility by passivating oxygen vacancies and reducing silicon dangling bonds
Implementation Method 2
a gate dielectric layer that comprises dipole elements that may tune the threshold voltage of semiconductor devices
Implementation Method 3
improved mobility by passivating oxygen vacancies and reducing silicon dangling bonds
Data Source
AI summary
A method of forming a semiconductor device includes forming a first dielectric layer over a first channel region in a first region and over a second channel region in a second region; introducing a first dipole element into the first dielectric layer in the first region to form a first dipole-containing gate dielectric layer in the first region; forming a second dielectric layer over the first dipole-containing gate dielectric layer; introducing fluorine into the second dielectric layer to form a first fluorine-containing gate dielectric layer over the first dipole-containing gate dielectric layer; and forming a gate electrode over the first fluorine-containing gate dielectric layer.