Semiconductor Interconnection Layout via Via Swapping
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Solution Overview
Problem
The increasing demand for high-reliability, high-performance semiconductor devices with multiple functions poses challenges in achieving efficient interconnection structures and layout designs that minimize process risks during fabrication, particularly in the integration of metal lines and vias.
Innovation Solution
A semiconductor device layout design method that involves swapping adjacent upper metal patterns and via patterns to reduce process risks, while maintaining the original layout for lower patterns, thereby enhancing integration density without increasing cell size or dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional layout design is used for interconnection structures, then manufacturing process is simpler, but process risks increase during fabrication
Solution Approach 1:
The patent applies inversion by swapping the positions of upper metal patterns and via patterns in the layout design. Specifically, upper metal patterns that would normally be positioned directly above lower metal patterns are instead positioned adjacent to them, and vias are relocated accordingly. This inverted approach redistributes process risks to less critical areas while maintaining electrical connectivity, thereby reducing overall fabrication process risks without significantly increasing layout complexity
Solution Approach 2:
The patent implements preliminary action by performing layout optimization and risk assessment before the actual fabrication process. The design stage incorporates pre-calculated via positions and metal pattern arrangements that anticipate and mitigate potential fabrication issues. This preliminary planning allows the interconnection structure to be manufactured with reduced process risks, as the layout is specifically designed to accommodate variations and challenges that may arise during fabrication
2Productivity
If integration density is increased, then device performance improves, but cell size increases
Solution Approach 1:
The patent applies dimensionality change by utilizing the vertical stacking of metal layers and via connections to increase integration density without expanding the horizontal cell footprint. The interconnection structure employs multiple metal layers (upper and lower metal patterns) connected through vias, creating a three-dimensional routing architecture. This allows signals to be transmitted through vertical and lateral paths within the same planar area, effectively increasing the number of interconnections per unit area without increasing cell dimensions
3Reliability
If upper metal patterns are swapped with via patterns, then process risks are reduced, but layout design complexity increases
Solution Approach 1:
The patent applies universality by creating a standardized layout design methodology that can be applied across different interconnection structures. The swapping technique establishes a universal approach where upper metal patterns and via patterns can be systematically exchanged in various configurations depending on the specific design requirements. This multi-functional layout strategy provides a flexible framework that simplifies the design process by offering proven patterns and rules that can be reused, thereby reducing layout design complexity despite the increased flexibility in pattern arrangement
Data Source
AI summary
A semiconductor device includes a substrate, a gate electrode on the substrate, an insulating layer on the gate electrode, first and second lower vias in the insulating layer, first and second lower metal lines provided on the insulating layer and respectively connected to the first and second lower vias, and first and second upper metal lines provided on and respectively connected to the first and second lower metal lines. When viewed in a plan view, the first lower via is overlapped with the second upper metal line, and the second lower via is overlapped with the first upper metal line.