Substrate Chuck Pin Structure for Void-Free Wafer Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The semiconductor wafer bonding process often results in defects such as voids and overlays due to improper contact and alignment of substrates during bonding.
Innovation Solution
A substrate chuck design featuring a base with support pins and a dam portion, along with vacuum channels and lift holes, ensures precise contact and alignment by minimizing contact area and preventing foreign materials from interfering with bonding, using a SiC material for rigidity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a large contact area is used between substrate and chuck, then stability and support are improved, but alignment precision and bonding quality deteriorate due to deformation and foreign material interference
Solution Approach 1:
The substrate chuck contact surface is segmented into multiple discrete support pins instead of a continuous large-area contact surface. This segmentation provides stable support through multiple points while minimizing the total contact area, preventing substrate deformation and foreign material interference that would occur with large-area contact.
Solution Approach 2:
Different regions of the substrate chuck have different support pin heights creating localized quality variations. First support pins in the first region have heights greater than distances to adjacent pins, while second support pins in the second region have varying heights with descending gradients. This local quality differentiation provides stable support while maintaining precise alignment and preventing deformation.
2Area of stationary object
If support pins are arranged closely together, then substrate support coverage is improved, but foreign material entrapment and bonding defects increase
Solution Approach 1:
The support structure is segmented into discrete pins with spacing between them, creating a pattern that provides coverage while allowing foreign materials to be excluded from bonding interfaces. The segmented pin arrangement covers the necessary substrate areas without creating continuous surfaces where contaminants could be trapped.
Solution Approach 2:
The dam portion acts as an intermediary structure that surrounds the support pins and prevents foreign materials from reaching the bonding interface. This intermediary element blocks contaminants while allowing the support pins to maintain substrate coverage and positioning.
3Ease of manufacture
If uniform support pin heights are used, then manufacturing simplicity is improved, but bonding uniformity and defect prevention deteriorate
Solution Approach 1:
The support pins are designed with non-uniform heights tailored to specific regional requirements. First support pins have heights greater than distances to adjacent pins for optimal support, while second support pins have descending gradients toward the dam portion. This local quality optimization ensures uniform bonding results across different substrate regions.
Solution Approach 2:
The support pin height parameter is varied across different regions and individual pins to optimize bonding uniformity. By changing the height parameter locally rather than maintaining a uniform value, the system achieves precise control over substrate contact and bonding quality across the entire bonding area.
4Ease of operation
If a flat substrate contact surface is used, then ease of operation is improved, but bonding precision and void defect prevention worsen
Solution Approach 1:
The contact surface is segmented into discrete support pins with varying heights rather than a continuous flat surface. This segmentation maintains ease of operation by providing clear positioning points while improving bonding precision through controlled, non-uniform contact that prevents void defects and ensures uniform bonding pressure distribution.
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
This design effectively reduces the occurrence of bonding defects by maintaining precise contact and minimizing deformation, thereby enhancing the bonding process's reliability and quality.
Implementation Method 1
a vacuum channel disposed in the base
Data Source
AI summary
Provided are a substrate chuck and a substrate bonding system including the substrate chuck. The substrate bonding system includes a lower substrate chuck and an upper substrate chuck disposed on the lower substrate chuck. The lower substrate chuck has a non-flat lower substrate contact surface, and the upper substrate chuck has a flat upper substrate contact surface.