Partitioned Wafer Bonding Chuck for Saddle Warpage Compensation
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Solution Overview
Problem
Existing wafer bonding devices face challenges in achieving precise alignment and bonding accuracy due to warpage, particularly saddle warpage, which occurs in wafers mounted on lower chucks during the wafer-to-wafer bonding process for flash memory devices.
Innovation Solution
A chuck for a wafer bonding device featuring a body with a partitioned internal space, controlled by valves and sensors, allowing for asymmetrical deformation of the wafer surface to accommodate warpage, by adjusting pneumatic pressure in separate regions to match the wafer's shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional chuck with uniform internal space is used, then the structure is simple, but it cannot accommodate saddle warpage of wafers resulting in low bonding accuracy
Solution Approach 1:
The internal space of the chuck is divided into multiple regions by partitions, allowing independent pneumatic control of each region. This segmentation enables asymmetric deformation of the deformable plate to accommodate saddle warpage of wafers, thereby improving bonding accuracy without excessive complexity
Solution Approach 2:
Different regions of the internal space are provided with different pneumatic pressures through independently controlled valves. This creates local variations in the deformable plate's shape, allowing precise compensation for saddle warpage in specific areas while maintaining overall structural simplicity
2Manufacturing precision
If asymmetrical deformation capability is added to accommodate saddle warpage, then bonding accuracy improves, but the device complexity increases
Solution Approach 1:
The chuck's internal space is divided into a predetermined number of regions (e.g., 4 regions) with partitions and corresponding valves/sensors. This moderate segmentation provides sufficient asymmetric deformation capability for saddle warpage compensation while avoiding excessive device complexity
Solution Approach 2:
Sensors are installed in each region to detect the actual shape of the deformable plate, providing feedback to the control system. This enables closed-loop control that automatically adjusts pneumatic pressure to achieve the desired asymmetric deformation, improving bonding accuracy without requiring complex mechanical adjustment mechanisms
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
Enhances bonding accuracy by enabling asymmetrical deformation of the wafer surface to compensate for warpage, improving alignment and bonding precision.
Implementation Method 1
a valve installed on the body and that provides pneumatic pressure to each divided internal space. The valve adjusts and supplies pneumatic pressure to the divided internal space so that a shape of an upper surface of a deformable plate of the chuck portion is deformed
Data Source
AI summary
A chuck for a wafer bonding device includes a body, a chuck portion installed on the body and that forms an internal space together with the body, and that includes a partition that divides the internal space, a valve installed on the body and that provides pneumatic pressure to each divided internal space, and a sensor disposed on the body at a lower portion of the partition. The valve adjusts and supplies pneumatic pressure to the divided internal space so that a shape of an upper surface of a deformable plate of the chuck portion is deformed.