MIM Border Structure for CMP Dishing in Semiconductor Fins
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Solution Overview
Problem
The semiconductor industry faces challenges in maintaining integration density and complexity management as feature sizes decrease, leading to issues such as CMP dishing effects in semiconductor manufacturing processes.
Innovation Solution
The implementation of a metal-insulator-metal (MIM) structure in the border regions of semiconductor device structures, which includes a first conductive layer, a dielectric layer, and a second conductive layer, helps reduce CMP dishing effects and conserves metal routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional semiconductor manufacturing processes are used with continuous fin structures across border regions, then manufacturing simplicity is maintained, but CMP dishing effects occur and manufacturing precision deteriorates
Solution Approach 1:
The patent divides the border region into discrete sections by forming separate MIM structures at different locations rather than using a continuous fin structure. This segmentation allows different regions to be processed independently, preventing the propagation of CMP dishing effects across the entire border region while maintaining manufacturing simplicity through standardized MIM structure replication.
Solution Approach 2:
The patent introduces MIM structures as intermediary elements in the border region between first and second regions. These MIM structures act as mediators that disrupt the continuous fin structure, thereby preventing CMP dishing effects from affecting the entire border region while still allowing the border region to serve its function of separating different device regions.
2Quantity of substance
If feature sizes are reduced to increase integration density, then more components can be integrated into a given area, but process complexity increases
Solution Approach 1:
The patent employs MIM structures that serve multiple functions: they act as capacitors for device operation, serve as placeholders during manufacturing processes, and function as region separators in the border area. This multi-functionality allows a single structure type to address multiple requirements, thereby increasing integration density without proportionally increasing process complexity.
Solution Approach 2:
The patent utilizes the MIM structures' ability to be formed with varying parameters (size, position, material composition) to adapt to different design requirements. By changing these parameters rather than creating entirely different structure types, the patent achieves high integration density while maintaining relatively simple manufacturing processes through parameter optimization rather than structural complexity.
Data Source
AI summary
A semiconductor device structure and methods of forming the same are described. In some embodiments, the structure includes a first region including a gate electrode disposed over a semiconductor fin, a second region, and a border region disposed between the first and second regions. The border region includes a metal-insulator-metal (MIM) structure, and the MIM structure includes a first conductive layer disposed over the semiconductor fin, a first dielectric layer in contact with the first conductive layer, and a second conductive layer in contact with the first dielectric layer. A top surface of the second conductive layer and a top surface of the gate electrode may be substantially co-planar.