Mechanically Flexible Interconnects for Irregular 3D Chip Stacks
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Solution Overview
Problem
In 3D integrated circuits and dense multi-die packages, thermal and physical stresses at connection points between chips pose challenges due to irregular chip shapes and varying distances, requiring interconnects with varying lengths to maintain mechanical compliance and reduce stress.
Innovation Solution
Mechanically flexible interconnects (MFIs) with different geometries, materials, and pitches are fabricated on a single substrate to ensure similar compliance, allowing for effective contact across varying distances without causing undue stress, even on irregularly shaped chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interconnects with varying lengths are used to accommodate irregular chip shapes and varying distances, then mechanical compliance and stress reduction are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by creating interconnects with varying geometries (different lengths, widths, and profiles) at specific locations on the substrate. Each interconnect is customized to match the local requirements for mechanical compliance and stress distribution, allowing irregular chip shapes and varying distances to be accommodated without requiring complex custom fabrication for each interconnect individually.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying interconnect dimensions (length, width, thickness, profile height) based on their position and function. This allows a continuous range of mechanical compliance values to be achieved across the substrate, enabling adaptation to irregular chip geometries while maintaining manufacturability through standardized fabrication processes.
2Reliability
If interconnects are customized for each chip position to handle irregular shapes, then connection reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent achieves universality by using a single substrate and standardized fabrication process to create multiple interconnects with different geometries. The same manufacturing platform produces all interconnect variants, eliminating the need for separate custom fabrication processes and reducing precision requirements compared to individually customized interconnects.
Solution Approach 2:
The patent introduces additional geometric dimensions (profile height, curvature radius, width variations) beyond simple length adjustment. This multi-dimensional geometry control provides more degrees of freedom for achieving desired mechanical compliance while maintaining manufacturability through conventional fabrication techniques.
3Adaptability or versatility
If mechanically flexible interconnects with varying geometries are fabricated on a single substrate, then adaptability to irregular chip shapes improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the substrate into multiple regions, each containing interconnects optimized for local chip placement requirements. This modular approach allows different interconnect geometries to be systematically distributed across the substrate, improving adaptability to irregular chip shapes while maintaining organized, manufacturable structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of MFIs with varying geometries and materials ensures similar mechanical compliance, reducing stress during chip connections and enabling effective contact across different distances, thus addressing the challenges of irregular chip shapes and thermal coupling.
Implementation Method 1
metallizing on the at least one shape of photoresist and the surface of the substrate to form a plurality of mechanically flexible interconnects
Data Source
AI summary
Disclosed are various embodiments that involve mechanically flexible interconnects, methods of making mechanically flexible interconnects, methods of using mechanically flexible interconnects, and the like.