Unified Crackstop Structure for Semiconductor Build Gaps
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Solution Overview
Problem
In semiconductor packaging, thermal compression bonding leaves gaps between semiconductor builds where cracks can form, leading to potential separation and catastrophic failure due to external or internal crack growth, delamination, and warpage from chip package interaction.
Innovation Solution
A unified crackstop structure is formed by bonding metal lines to crackstop structures on the peripheries of semiconductor builds, creating a continuous metal wall to prevent crack nucleation and growth, delamination, and warpage, enhancing the rigidity and strength of the semiconductor structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal compression bonding is used to join semiconductor builds, then the bonding process is simple and efficient, but gaps are left between semiconductor builds where cracks can form and propagate
Solution Approach 1:
The patent merges the crackstop structures from two separate semiconductor builds by bonding metal lines from each build together, creating a unified continuous crackstop structure that spans across the interface between builds. This eliminates the gap discontinuity and provides uninterrupted crack propagation blocking while maintaining the simplicity of thermal compression bonding process.
Solution Approach 2:
The metal lines acting as crackstop structures serve as intermediary elements that bridge the gap between semiconductor builds. These metal lines are bonded together to form a unified structure that mediates the stress and crack propagation issues at the interface, preventing cracks from bypassing the crackstop functionality.
2Ease of manufacture
If gap spaces are left between semiconductor builds during bonding, then the bonding process is easier, but cracks can separate the bonded builds or provide entry points for catastrophic failure
Solution Approach 1:
The patent combines the discrete crackstop structures from adjacent semiconductor builds into a single unified metal line structure. This merged structure eliminates the weak gap region and creates a continuous barrier that maintains structural integrity while allowing the bonding process to proceed with standard techniques.
Solution Approach 2:
The unified crackstop structure functions as a composite element combining metal lines from both semiconductor builds, creating a hybrid structure that leverages the strength of metal interconnects to provide enhanced crack resistance and structural integrity at the build interface.
3Reliability
If crackstop structures are placed at the periphery of semiconductor builds, then they can block cracks, but gaps between builds allow cracks to bypass these structures and reach active device regions
Solution Approach 1:
The patent extends the crackstop protection by bonding peripheral metal lines from adjacent semiconductor builds together, creating a continuous unified crackstop structure that eliminates bypass paths. This merging approach maintains the simple peripheral placement strategy while achieving continuous crack blocking coverage across the build interface.
Solution Approach 2:
The unified metal line structure provides continuous crackstop functionality across the entire interface region, ensuring that the crack blocking action is uninterrupted. The bonded metal lines create an unbroken barrier that maintains the useful crackstop action continuously across what would otherwise be a discontinuous gap region.
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 solution effectively blocks external cracks, prevents internal delamination, and enhances the structural integrity by forming a rigid structure that resists shear tearing and pull-apart forces, thereby improving the reliability of semiconductor packages.
Implementation Method 1
two or more semiconductor builds may be joined together by thermal compression bonding
Data Source
AI summary
A unified crackstop structure is described incorporating at least two semiconductor builds, each having a crackstop structure on its periphery and a metal wall or line extending from one crackstop structure to the other.