Guard Ring Structure for Semiconductor Structural Integrity
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Solution Overview
Problem
Semiconductor devices face challenges in maintaining structural integrity and preventing delamination of low dielectric constant and extra-low k insulating materials as device sizes decrease, leading to potential mechanical weakness and noise interference.
Innovation Solution
Incorporating novel guard rings formed in metallization layers with conductive lines and vias, which provide structural support, reduce stress on insulating materials, and act as noise shields, while being easily integratable into existing manufacturing processes without additional lithography masks or steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If device size is reduced to improve integration density, then more components can be integrated into a given area, but structural integrity and mechanical strength deteriorate
Solution Approach 1:
The device structure is segmented into functional regions separated by guard rings. The guard rings act as independent structural elements that provide mechanical support to each segmented region, preventing overall structure failure while allowing high integration density within each segment.
Solution Approach 2:
The guard rings are formed using composite material structures combining conductive materials (copper, aluminum, or doped polysilicon) with insulating materials (dielectric layers). This composite approach provides both mechanical strength for structural integrity and electrical functionality for noise shielding while maintaining compact size.
2Reliability
If low dielectric constant and extra-low k insulating materials are used to improve device performance, then electrical performance is enhanced, but delamination and mechanical weakness occur
Solution Approach 1:
Guard rings are positioned around functional regions before interconnect structures are fully assembled. These pre-positioned structural elements provide mechanical cushioning and support to the low-k dielectric materials, preventing stress-induced delamination while allowing the beneficial electrical properties of these materials to be maintained.
Solution Approach 2:
The guard rings provide localized mechanical reinforcement specifically at critical interfaces where low-k dielectric materials are most vulnerable to delamination. This local quality enhancement allows the use of low-k materials in regions where they provide electrical performance benefits without compromising overall structural stability.
3Strength
If guard rings are added to provide structural support and noise shielding, then mechanical robustness and noise resistance improve, but device complexity increases
Solution Approach 1:
The guard rings serve multiple functions simultaneously: they provide mechanical structural support to prevent delamination, act as electrical noise shields through their conductive material composition, and define functional region boundaries. This multi-functionality reduces the need for separate dedicated structures for each function, thereby limiting the increase in device complexity.
Solution Approach 2:
The guard ring structure merges structural support and noise shielding functions into a single integrated element. By combining what would otherwise require separate structural reinforcements and noise shield components, the overall device complexity is minimized while achieving both mechanical robustness and electromagnetic interference protection.
Data Source
AI summary
In some embodiments, an integrated circuit (IC) device includes a substrate having a first functional region, a second functional region and a third functional region. The IC device also includes a plurality of dielectric layers over the substrate, a first guard ring in the plurality of dielectric layers and around the first functional region, and a second guard ring in the plurality of dielectric layers and around the second functional region. The second guard ring is separate from the first guard ring, and the third functional region is free of a guard ring. The IC device further includes a seal ring in the plurality of dielectric layers. The seal ring encircles the first and the second guard rings, and is separate from the first and the second guard rings.