Bond Chuck Segmentation for Adhesive Uniformity
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Solution Overview
Problem
Conventional semiconductor bonding processes result in significant total thickness variation (TTV) of adhesive films, leading to increased vertical footprint and warpage of semiconductor devices due to uneven adhesive distribution across the substrate.
Innovation Solution
The use of bond chucks with individually-controllable regions that can move and be heated independently, allowing for precise control over adhesive distribution by adjusting the position and temperature of these regions to achieve a more even adhesive thickness and mitigate warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If adhesive is spun onto the center portion of the substrate and the semiconductor die is moved toward the substrate, then the adhesive is displaced laterally toward peripheral portions, but the distribution of adhesive to peripheral portions is limited resulting in significant thickness variation
Solution Approach 1:
The bond chuck is divided into multiple independently controllable regions (e.g., first region, second region, third region) that can be moved relative to one another. This segmentation allows different zones of the substrate to receive customized adhesive distribution patterns, enabling precise control over adhesive thickness across the entire substrate area and reducing total thickness variation.
Solution Approach 2:
The bond chuck regions are made dynamically adjustable, allowing the relative positions of different regions to be changed during the bonding process. This dynamic reconfiguration enables optimization of adhesive flow patterns and distribution for each specific bonding operation, achieving more uniform adhesive thickness compared to static conventional bond chucks.
2Volume of moving object
If adhesive is concentrated at center portions of the substrate, then the vertical footprint of the semiconductor device increases, but this concentration is a result of limited adhesive displacement to peripheral portions
Solution Approach 1:
By segmenting the bond chuck into multiple independently controllable regions, the system can create optimized adhesive distribution patterns that spread adhesive more evenly across the substrate including peripheral areas. This reduces adhesive concentration at the center, thereby minimizing the vertical footprint of the final semiconductor device while maintaining uniform thickness.
Solution Approach 2:
The system changes the positional parameters of different bond chuck regions relative to one another to optimize adhesive flow patterns. By adjusting these parameters, the adhesive can be more effectively distributed to peripheral portions, reducing both thickness variation and overall adhesive volume required, which decreases vertical footprint.
3Stability of the object's composition
If adhesive distribution is uneven across the substrate, then warpage of the semiconductor device occurs, but this is caused by significant total thickness variation of the adhesive film
Solution Approach 1:
Segmenting the bond chuck allows independent control of different regions to compensate for warpage-prone areas. By adjusting the position and movement of individual regions, the system can achieve more uniform adhesive thickness distribution, which directly reduces differential stress and minimizes warpage of the bonded semiconductor device.
4Device complexity
If conventional bonding processes are used, then the process is simple, but the total thickness variation is approximately ten percent of the overall adhesive film thickness
Solution Approach 1:
While segmentation of the bond chuck into multiple controllable regions increases device complexity, it dramatically improves adhesive thickness uniformity by enabling region-specific control of adhesive distribution. The patent accepts this increased complexity as necessary to achieve TTV reduction from 10% to below 5%.
Solution Approach 2:
The dynamic adjustability of bond chuck regions provides a controllable mechanism to optimize bonding outcomes. Although this adds complexity to the bonding process, it enables precise control over adhesive distribution that reduces TTV and improves manufacturing precision.
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 approach reduces TTV to less than 5% of the total adhesive thickness and effectively minimizes warpage by ensuring a uniform adhesive distribution across the substrate, improving the manufacturing process for semiconductor devices.
Implementation Method 1
the first region is configured to be heated to a first temperature within a first temperature range, the second region is configured to be heated to a second temperature within a second temperature range, and the third region is configured to be heated to a third temperature within a third temperature range
Data Source
AI summary
A bond chuck having individually-controllable regions, and associated systems and methods are disclosed herein. The bond chuck comprises a plurality of individual regions that are movable relative to one another in a longitudinal direction. In some embodiments, the individual regions include a first region having a first outer surface, and a second region peripheral to the first region and including a second outer surface. The first region is movable in a longitudinal direction to a first position, and the second region is movable in the longitudinal direction to a second position, such that in the second position, the second outer surface of the second region extends longitudinally beyond the first outer surface of the first region. The bond chuck can be positioned proximate a substrate of a semiconductor device such that movement of the first region and/or second region affect a shape of the substrate, which thereby causes an adhesive on the substrate to flow in a lateral, predetermined direction.