CMOS FinFET Buffer Layer Epitaxial Growth Process
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Solution Overview
Problem
Existing FinFET device manufacturing processes are complex and costly, requiring multiple patterning and etching steps, which increases cycle time and reduces efficiency.
Innovation Solution
A method for fabricating a CMOS FinFET device that simultaneously processes NMOS and PMOS regions, reducing the number of manufacturing steps by forming isolation features, buffer layers, and fin structures in a coordinated manner, using epitaxial growth and planarizing processes to define fin structures and minimize excess material, thereby simplifying the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple patterning and etching steps are used to manufacture FinFET devices, then device performance and density are improved, but manufacturing complexity and cycle time increase
Solution Approach 1:
The patent combines the formation of isolation features, buffer layers, and fin structures into a single coordinated epitaxial growth process. Multiple regions (NMOS and PMOS) are processed simultaneously in one manufacturing step rather than through multiple sequential patterning and etching steps, thereby reducing manufacturing complexity while maintaining device performance
Solution Approach 2:
The epitaxial growth process serves multiple functions simultaneously: it forms isolation features, creates buffer layers for stress management, and defines fin structures for both NMOS and PMOS devices. This multi-functional approach eliminates the need for separate processing steps for each feature type
2Manufacturing precision
If multiple patterning and etching steps are used to manufacture FinFET devices, then device density is improved, but production cycle time increases
Solution Approach 1:
The patent implements continuous epitaxial growth that simultaneously forms multiple device features without interruption. The process maintains continuous useful action by processing entire wafers in one step rather than through multiple sequential operations, significantly reducing cycle time while achieving high device density
Solution Approach 2:
The buffer layers are formed preliminarily during the epitaxial growth process before final device fabrication steps. This preliminary formation of stress-managed buffer layers eliminates the need for subsequent time-consuming etching and patterning steps to create fin structures
3Manufacturing precision
If multiple patterning and etching steps are used to manufacture FinFET devices, then manufacturing precision is improved, but production cost increases
Solution Approach 1:
By merging the formation of isolation features, buffer layers, and fin structures into a single epitaxial growth step, the patent reduces the total number of manufacturing operations. This consolidation maintains precise device performance while lowering production costs by eliminating multiple costly patterning and etching steps
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 minimizes manufacturing steps, reduces cycle time, and provides cost savings without compromising device performance, allowing for efficient production of CMOS FinFET devices with reduced complexity.
Implementation Method 1
forming a buffer layer over the recessed substrate and between the isolation features
Implementation Method 2
using epitaxial growth and planarizing processes to define fin structures and minimize excess material
Data Source
AI summary
A semiconductor device and method for fabricating a semiconductor device is disclosed. An exemplary semiconductor device includes a substrate including a first region and a second region. The semiconductor device further includes a first buffer layer formed over the substrate and between first and second isolation regions in the first region and a second buffer layer formed over the substrate and between first and second isolation regions in the second region. The semiconductor device further includes a first fin structure formed over the first buffer layer and between the first and second isolation regions in the first region and a second fin structure formed over the second buffer layer and between the first and second isolation regions in the second region. The first buffer layer includes a top surface different from a top surface of the second buffer layer.