Resonant Frequency Detection for Substrate Bonding Control
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Solution Overview
Problem
In semiconductor device manufacturing, existing substrate bonding processes face challenges in accurately controlling the bonding propagation distance between substrates, leading to potential misalignment and reduced productivity due to the lack of precise monitoring of resonant frequencies during the bonding process.
Innovation Solution
A substrate bonding apparatus is developed, incorporating a first and second bonding chuck, a resonant frequency detector, a vibration sensor, an analyzer, and a controller to detect the resonant frequency and bonding propagation distance of the bonded structure, allowing for real-time control of the bonding process and enhancing precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If substrate bonding process is performed without resonant frequency monitoring, then the bonding process can be completed, but the bonding propagation distance cannot be accurately controlled
Solution Approach 1:
The patent implements a feedback mechanism where the resonant frequency detector continuously monitors the resonant frequency of the bonded structure during the bonding process. This real-time feedback enables the controller to adjust the bonding parameters to maintain accurate control of the bonding propagation distance, resolving the contradiction between precision and complexity by adding a targeted monitoring function rather than a complete system overhaul.
Solution Approach 2:
The patent replaces traditional mechanical measurement methods for monitoring bonding propagation with a non-contact resonant frequency detection system. By using vibrational characteristics and resonant frequency analysis, the system achieves precise measurement of bonding propagation distance without complex mechanical sensors or direct physical contact, reducing overall device complexity while maintaining high precision.
2Productivity
If traditional bonding process is used without resonant frequency detection, then the process is simpler, but productivity decreases due to misalignment and rework
Solution Approach 1:
The real-time resonant frequency monitoring provides continuous feedback on bonding propagation, enabling immediate detection and correction of alignment issues. This prevents misalignment and rework, directly improving productivity by ensuring correct bonding on the first attempt while maintaining measurement precision through the detector system.
Solution Approach 2:
The system performs preliminary detection of bonding propagation distance through resonant frequency analysis during the bonding process, allowing for early identification of potential alignment issues before they result in defective bonds. This preliminary monitoring action prevents the need for rework and improves overall productivity.
3Manufacturing precision
If resonant frequency detector and vibration sensor are added to the bonding apparatus, then bonding precision is improved, but device complexity increases
Solution Approach 1:
The resonant frequency detector serves multiple functions: it monitors bonding propagation distance, detects completion of bonding, and provides feedback for process control. By making this single component multi-functional, the patent achieves high bonding precision without adding numerous separate devices, thereby limiting the increase in device complexity.
Solution Approach 2:
The vibration sensor acts as an intermediary that translates mechanical vibrations of the bonded structure into electrical signals that can be analyzed by the controller. This intermediary component enables precise measurement of bonding propagation through resonant frequency analysis without requiring direct mechanical contact or complex measurement systems, balancing precision improvement with controlled complexity increase.
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 apparatus enables precise control of the bonding process, improving the accuracy of substrate bonding and increasing productivity by monitoring resonant frequencies and adjusting the bonding propagation distance, thereby enhancing the precision and efficiency of semiconductor device manufacturing.
Implementation Method 1
a vibration sensor detecting a vibration of a bonded structure with the first substrate and the second substrate which are at least partially bonded to each other
Implementation Method 2
a resonant frequency detector detecting a resonant frequency of a bonded structure with the first substrate and the second substrate which are at least partially bonded to each other
Data Source
AI summary
A substrate bonding apparatus for bonding a first substrate to a second substrate includes a first bonding chuck supporting the first substrate, a second bonding chuck disposed above the first bonding chuck and supporting the second substrate, a resonant frequency detector detecting a resonant frequency of a bonded structure with the first substrate and the second substrate which are at least partially bonded to each other, and a controller controlling a distance between the first bonding chuck and the second bonding chuck according to the detected resonant frequency of the bonded structure.