Wafer Bonding Apparatus with Deformable Pressure Profile Control
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Solution Overview
Problem
Existing wafer bonding apparatuses do not effectively absorb variations in wafer thickness during pressurizing and heating, which hinders the improvement of flatness at the bonding interface.
Innovation Solution
A wafer bonding apparatus with a pressure profile control module that includes a hollow portion to control pressure, allowing the deformation of the pressure profile control module to absorb wafer thickness variations, and a heater unit with multiple heating modules to transmit these deformations to the top plate, enabling the adjustment of the pressurizing surface shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pressurizing and heating are performed with a fixed pressurizing surface, then the bonding process can be completed, but the flatness of the wafer bonding interface deteriorates due to unabsorbed wafer thickness variations
Solution Approach 1:
The pressurizing surface is made dynamically adjustable through a pressure profile control module that can change its shape in response to detected wafer thickness variations. The module includes multiple pressure control regions that can independently adjust local pressure distribution, transforming a static pressurizing system into a dynamic one that adapts to real-time wafer conditions to maintain bonding interface flatness.
Solution Approach 2:
The pressure distribution parameters across the pressurizing surface are changed dynamically based on wafer thickness measurements. The pressure profile control module adjusts local pressure values in different regions to compensate for thickness variations, thereby optimizing the bonding interface flatness without requiring physical modification of the pressurizing surface structure.
2Manufacturing precision
If pressure is applied uniformly across the wafer surface, then the bonding process is simple, but wafer thickness variations cannot be absorbed and bonding interface flatness deteriorates
Solution Approach 1:
The pressurizing surface is segmented into multiple pressure control regions, each capable of independent pressure adjustment. This segmentation allows localized pressure compensation for thickness variations in different wafer areas while maintaining overall process simplicity through automated control of each segment.
Solution Approach 2:
Different pressure values are applied to different regions of the wafer surface based on local thickness characteristics. The pressure profile control module implements local quality by adjusting pressure distribution to match the specific topography of each wafer region, optimizing bonding interface flatness without complicating the overall operation.
3Manufacturing precision
If the pressurizing surface shape is changed to absorb wafer thickness variations, then bonding interface flatness improves, but the device structure becomes more complex
Solution Approach 1:
The mechanical system for changing pressurizing surface shape is replaced with a pressure control system. Instead of using complex mechanical actuators to physically deform the pressurizing surface, the invention uses a pressure profile control module that achieves shape adaptation through controlled pressure distribution, simplifying the mechanical structure while maintaining the ability to absorb wafer thickness variations.
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 solution allows for improved flatness of the wafer bonding interface by dynamically adjusting the pressurizing surface to compensate for wafer thickness variations, enhancing the bonding process.
Implementation Method 1
a change in shape generated in a surface of the pressure profile control module is brought to a surface of the top plate
Implementation Method 2
The wafers are, for example, heated to activate the electrode bonding surfaces
Implementation Method 3
a hollow portion is provided in the pressure profile control module such that a pressure in the hollow portion can be controlled
Data Source
AI summary
Provided is a wafer bonding apparatus which performs pressurization and heating and eliminates nonuniformity of wafer thickness by changing the shape of a pressurizing surface so that planarity of a wafer bonding surface is improved. The wafer bonding apparatus places a plurality of wafers to be bonded between an upper unit (101U) and a lower unit (101L), and bonds the wafers by applying pressure and heat by the upper unit and the lower unit. The wafer bonding apparatus is provided with a top plate (111), a pressure profile control module (131), and a heater section arranged between the top plate and the pressure profile control module for heating. Shape change generated on the surface of the pressure profile control module causes change of the surface of the top plate.