FinFET Adhesion Sheath for Isolation and Metal Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As semiconductor devices continue to shrink, traditional planar transistor structures face challenges in maintaining operation speed, leading to the development of non-planar structures like FinFETs with elevated vertical fins. However, these structures require precise manufacturing processes to ensure effective gate stack formation, spacer creation, and metal connector integration, which is complicated by the need for precise etching and isolation to maintain device performance and reliability.
Innovation Solution
The manufacturing process for FinFET devices involves forming a gate stack structure on a substrate with spacers, followed by a dielectric layer and metal connectors. A conformal adhesion layer is used to form sheath structures within contact openings, which exposes the source and drain regions while maintaining isolation, allowing for accurate metal connector placement and enhancing device reliability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional planar transistor structures are used, then manufacturing process is simpler, but operation speed decreases as gate width and channel length shrink
Solution Approach 1:
The patent transitions from planar two-dimensional transistor structures to three-dimensional FinFET structures with vertical fins. This dimensional change allows the gate to control the channel from three sides, improving carrier control and operation speed while accommodating continued scaling of gate dimensions without proportionally increasing manufacturing complexity
2Speed
If FinFET structures with elevated vertical fins are used, then operation speed increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs preliminary patterning steps including mandrel formation and spacer deposition before final gate stack definition. These preliminary structures serve as templates that guide subsequent etching and deposition processes, ensuring precise FinFET gate stack formation while reducing the complexity of direct high-precision patterning
Solution Approach 2:
The patent introduces intermediate structures such as spacers and mandrels that mediate between the patterning process and final gate stack formation. These intermediary elements enable indirect definition of critical dimensions, relaxing direct lithography precision requirements while maintaining fine feature size control
3Speed
If FinFET structures with elevated vertical fins are used, then operation speed increases, but device isolation and connector integration become more complicated
Solution Approach 1:
The patent segments the device structure into distinct functional regions with dedicated dielectric layers for isolation between gate stacks and around contact openings. This segmentation allows independent optimization of isolation structures from active device regions, simplifying the integration of metal connectors while maintaining FinFET performance
Data Source
AI summary
A fin-type field effect transistor device including a substrate, at least one gate stack structure, spacers and source and drain regions is described. The gate stack structure is disposed on the substrate and the spacers are disposed on sidewalls of the gate stack structure. The source and drain regions are disposed in the substrate and located at opposite sides of the gate stack structures. A dielectric layer having contact openings is disposed over the substrate and covers the gate stack structures. Metal connectors are disposed within the contact openings and connected to the source and drain regions, and adhesion layers are sandwiched between the contact openings and the metal connectors located within the contact openings.