Wafer Bonder Securing Mechanism for Particle Control
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Solution Overview
Problem
Existing wafer bonding technologies face challenges in applying uniform mechanical pressure and preventing the introduction of undesirable particles during the bonding process of thin and fragile wafers to a carrier plate, which can lead to uneven bonding and contamination.
Innovation Solution
A wafer bonding apparatus with a lid and base member configuration that includes securing mechanisms such as a push rod and support beam, allowing for adjustable pressure application and minimizing particle introduction through a design that separates the bonding chamber from potential sources of debris, using a diaphragm for pressure application and vacuum for secure holding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a lid is used to apply mechanical pressure during wafer bonding, then uniform bonding pressure is achieved, but particles may be introduced into the bonding chamber from the lid or securing mechanisms
Solution Approach 1:
The bonding chamber is segmented from the lid structure by using a transparent window material that separates the pressure application function from the bonding environment. The lid is divided into functional zones: a pressure application region and a bonding chamber region separated by the window, preventing particle generation in the bonding zone while maintaining pressure control.
Solution Approach 2:
A transparent window acts as an intermediary element between the pressure application mechanism and the bonding chamber. This window transmits mechanical pressure from the lid to the wafer-plate assembly while physically isolating the bonding chamber from potential particle sources in the lid structure and securing mechanisms.
2Manufacturing precision
If securing mechanisms are used to apply pressure on the lid, then uniform bonding pressure is achieved, but the complexity of the device increases
Solution Approach 1:
The lid structure is designed to perform multiple functions: it serves as both the pressure application surface and the sealing element for the bonding chamber. The transparent window integrates the pressure transmission function with the chamber enclosure, eliminating the need for separate pressure application mechanisms and reducing overall device complexity.
Solution Approach 2:
The design changes the physical state of the lid material to transparent, allowing visual monitoring and control of the bonding process. This parameter change enables simplified securing mechanisms while maintaining precise pressure control through optical feedback and uniform load distribution across the transparent window surface.
3Ease of operation
If the lid is designed to be easily opened and closed for wafer loading, then ease of operation is improved, but the reliability of maintaining bonding pressure may be compromised
Solution Approach 1:
The bonding chamber is pre-sealed with the transparent window before wafer loading. This preliminary sealing action ensures that once the wafer is placed and the lid closed, the pressure-tight environment is already established, maintaining bonding pressure reliability while allowing easy access during the loading phase when the chamber is not pressurized.
Solution Approach 2:
The transparent window is designed as a thin, flexible yet durable element that can accommodate repeated opening and closing cycles while maintaining its pressure sealing function. This flexible design allows easy lid operation for wafer loading while ensuring reliable pressure maintenance during the bonding process through elastic recovery and consistent sealing contact.
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
Ensures uniform bonding pressure and reduces the likelihood of particle contamination, facilitating efficient and reliable bonding of wafers to carrier plates while maintaining the integrity of the wafer surface.
Implementation Method 1
The pressure pathway can allow gas pressure to be provided to the location to allow the diaphragm to provide the bonding force
Implementation Method 2
The suction opening can be disposed so as to hold the assembly of wafer and plate during the bonding
Data Source
AI summary
Disclosed are various features associated with a securing mechanism for a wafer bonder. In certain situations, operation of securing mechanisms can generate undesirable particles and debris, and some them can be introduced to a wafer being bonded. In certain implementations, a securing mechanism can be configured to reduce the likelihood of such particles and debris being introduced to the wafer.