Horizontal Scrub Motion in Thermocompression Bonding
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Solution Overview
Problem
Misalignment between conductive structures in thermocompression bonding operations leads to undesirable stress and potential damage during the bonding of semiconductor elements to substrates, particularly when the initial placement offset results in large lateral forces.
Innovation Solution
Implementing a motion system that allows for relative horizontal movement between the semiconductor element and the substrate during thermocompression bonding, utilizing scrub motions to smooth out solder and reduce vertical forces required for bonding, thereby minimizing stress on conductive structures and improving alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermocompression bonding is performed without horizontal motion, then bonding simplicity is maintained, but misalignment between conductive structures causes large lateral forces and potential damage
Solution Approach 1:
The patent applies dynamics by introducing horizontal motion capability to the bonding system. The bonding head or substrate stage is equipped with motion systems that enable dynamic adjustment during the bonding process. This allows the system to actively compensate for misalignment between conductive structures by applying controlled horizontal movements, thereby reducing lateral forces and improving bonding reliability without excessive complexity
Solution Approach 2:
The patent utilizes parameter changes by modifying the bonding process parameters through horizontal motion. By dynamically adjusting the horizontal position of either the bonding head or substrate during bonding, the system can optimize the alignment between conductive structures. This parameter adjustment reduces lateral forces and improves bond quality while maintaining reasonable system complexity
2Manufacturing precision
If horizontal motion is applied during bonding, then lateral forces are reduced and alignment is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamics by integrating motion systems into the bonding apparatus. The bonding head or substrate stage includes actuators that provide controlled horizontal movement during the bonding process. This dynamic capability enables real-time alignment adjustment, significantly improving manufacturing precision while keeping the added complexity manageable through efficient system integration
Solution Approach 2:
The patent applies universality by designing the motion system to serve multiple functions. The same horizontal motion mechanism that improves alignment also helps compensate for thermal expansion, maintains optimal contact pressure distribution, and enables scrubbing actions to improve bond quality. This multi-functionality reduces the need for separate systems, thereby limiting the increase in device complexity
3Productivity
If misalignment occurs between conductive structures, then bonding can still proceed, but large lateral forces cause stress and potential damage to internal layers
Solution Approach 1:
The patent applies preliminary anti-action by implementing horizontal motion capability before the bonding process begins. The motion system is pre-configured to detect and compensate for misalignment between conductive structures at the start of bonding. By applying corrective horizontal movements in advance, the system prevents large lateral forces from developing during compression, thereby eliminating stress and potential damage to internal layers while maintaining bonding productivity
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 horizontal motion system enhances the quality of thermocompression bonds by reducing lateral forces, preventing damage to conductive structures and internal layers, and ensuring precise positional accuracy, thus improving the reliability of semiconductor package interconnections.
Implementation Method 1
heat is applied to the semiconductor element being bonded (e.g., through a heater in a bond head assembly carrying the bond tool)
Implementation Method 2
moving the semiconductor element relative to the substrate along at least one substantially horizontal direction using a motion system
Data Source
AI summary
A method of operating a thermocompression bonding system is provided. The method includes the steps of: bringing first conductive structures of a semiconductor element into contact with second conductive structures of a substrate in connection with a thermocompression bonding operation; and moving the semiconductor element relative to the substrate along at least one substantially horizontal direction using a motion system of at least one of the semiconductor element and the substrate.