Bonding Head with Segmented Compartments for Wafer Warpage
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Solution Overview
Problem
Wafer warpage negatively impacts the bonding process in advanced packaging techniques, leading to reduced bonding strength, poor adhesion, moisture resistance, and increased reliability issues in semiconductor device packages.
Innovation Solution
A bonding apparatus with a chuck and a bonding head that includes a divider, pneumatic components, and a diaphragm, which applies controlled pressing forces to substrates through a central and peripheral compartment configuration, calibrating warpage and enhancing bonding strength and hermetic quality by distributing pressure comprehensively and independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wafer-to-wafer bonding is performed on warped substrates, then bonding process can proceed, but bonding strength decreases and adhesion quality deteriorates
Solution Approach 1:
The bonding head is divided into multiple independent pressing regions (central region and peripheral regions) that can apply different pressing forces independently. This segmentation allows differential pressure application to compensate for substrate warpage, enabling reliable bonding even on warped substrates by applying higher pressure to regions with larger gaps and lower pressure to regions that are already close together.
Solution Approach 2:
Different pressing forces are applied to different regions of the substrate based on local warpage characteristics. The system adjusts the pressing force locally rather than applying uniform pressure, matching the pressing intensity to the specific needs of each region to achieve consistent bonding quality across the entire substrate surface despite variations in warpage.
2Reliability
If uniform pressing force is applied across the substrate, then the bonding process is simple, but warpage compensation is insufficient and bonding quality decreases
Solution Approach 1:
The pressing force control system is segmented into multiple independent control zones corresponding to different regions of the bonding head. Each zone can be controlled independently to apply the appropriate pressing force for its specific region, enabling warpage compensation without requiring an overly complex centralized control system.
Solution Approach 2:
The system applies pressing force selectively to specific regions rather than uniformly across the entire substrate. By applying excessive pressure only where needed (in regions with larger gaps due to warpage) and adequate pressure elsewhere, the system achieves good bonding quality without the complexity of precisely controlling every point on the substrate surface.
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 improves wafer-to-wafer bonding strength and hermetic quality, reducing the likelihood of delamination and popcorn effects, thereby increasing the yield and reliability of semiconductor packages.
Implementation Method 1
at least one pneumatic component disposed in at least one of the compartments
Implementation Method 2
The diaphragm is configured to press against the substrates to be bonded when the pneumatic components are inflated
Data Source
AI summary
A bonding apparatus includes a chuck and a bonding head. The chuck is configured to carry a plurality of substrates to be bonded. The bonding head has a cavity facing the chuck and includes a divider, at least one pneumatic component and a diaphragm. The divider is disposed in the cavity and dividing the cavity into a plurality of compartments. The at least one pneumatic component is disposed in at least one of the compartments. The diaphragm covers the cavity and is disposed between the at least one pneumatic component and the chuck.