Dummy Cell Array for Semiconductor Pattern Uniformity
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Solution Overview
Problem
The increasing complexity of semiconductor devices poses challenges in the precise design and fabrication of dummy cell arrays, leading to issues with pattern uniformity, etching process margins, and mechanical characteristics of interlayer insulating layers, which affect the overall performance and uniformity of semiconductor devices.
Innovation Solution
A semiconductor device design incorporating a dummy cell array with specific arrangements of dummy gate lines, filling patterns, vias, and wiring lines, which are not connected to the active devices, to enhance pattern uniformity and mechanical characteristics, and assist in processes like CMP and thermal annealing, thereby improving the fabrication method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dummy cell array is not precisely designed, then fabrication process becomes simpler, but pattern uniformity deteriorates
Solution Approach 1:
The dummy cell array is segmented into multiple functional components: dummy gate lines extending in the second direction, dummy active patterns crossing in the first direction, dummy filling patterns positioned between gate lines, dummy gate separation lines intersecting gate lines, and dummy wiring lines with vias. Each segment serves a specific function in maintaining pattern uniformity during fabrication processes.
Solution Approach 2:
Different regions of the dummy cell array are designed with specific local characteristics: dummy gate lines provide continuous coverage in the second direction, dummy active patterns provide coverage in the first direction, and dummy filling patterns fill specific gaps between structures. This local differentiation ensures uniform etching and deposition across the entire array.
2Manufacturing precision
If dummy cell array structure is simplified, then manufacturing becomes easier, but etching process margin deteriorates
Solution Approach 1:
The array is divided into etching-resistant dummy gate lines that extend continuously in the second direction, interspersed with dummy active patterns in the first direction. This segmentation creates a balanced pattern density that maintains consistent etching margins throughout the fabrication process.
Solution Approach 2:
The dummy cell array structures are designed and positioned in advance to pre-establish etching process margins before actual device fabrication. The dummy gate lines and active patterns are configured to compensate for potential etching variations, ensuring process robustness.
3Strength
If dummy cell array is not optimally designed, then design process becomes faster, but mechanical characteristics of interlayer insulating layers deteriorates
Solution Approach 1:
Dummy filling patterns are strategically positioned in specific locations between dummy gate lines and dummy active patterns to provide localized mechanical support. This targeted placement reinforces interlayer insulating layers where stress concentration occurs, improving overall mechanical characteristics without requiring uniform reinforcement throughout the entire array.
Solution Approach 2:
The mechanical support function is segmented and distributed through multiple dummy filling patterns positioned at critical locations, rather than using a single continuous support structure. This distributed reinforcement approach maintains mechanical strength while allowing flexibility in the overall array design.
Data Source
AI summary
A semiconductor device is disclosed. The semiconductor device includes a plurality of dummy gate lines parallel to each other in a first direction and extending in a second direction that is orthogonal to the first direction; a plurality of first dummy filling patterns between the plurality of dummy gate lines, the first dummy filling patterns parallel to each other in the first direction, and arranged apart from each other in the second direction; a plurality of first dummy vias on the plurality of first dummy filling patterns; and a plurality of first dummy wiring lines connected to the plurality of first dummy vias, the first dummy vias extending in the second direction, and parallel to each other in the first direction.