Wafer Boat Pin Layout to Reduce Bowing and Detachment
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Solution Overview
Problem
The existing wafer boat designs exacerbate wafer bowing and detachment issues due to thermal expansion during high-temperature solar cell manufacturing processes, leading to breakage and process interruptions, and cause interference during loading and unloading.
Innovation Solution
A wafer boat with a novel pin arrangement where pin pairs are positioned at different levels and angles to minimize contact, supporting wafers in a direction that forms a predetermined angle with the wafer's orientation, and are spaced to balance the wafer's load, reducing the risk of bowing and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If three pins are used to support the wafer on the plate, then the wafer can be stably supported during the process, but the wafer bowing phenomenon is deepened and the wafer may be caught or detached from the pin
Solution Approach 1:
The support structure is segmented into multiple pin pairs arranged at different positions and orientations on the plate. Each pin pair supports a specific region of the wafer, distributing the support function across multiple localized contact points rather than relying on a single three-pin configuration. This segmentation reduces the bowing effect by providing distributed support while maintaining reliable attachment.
Solution Approach 2:
Different regions of the wafer are supported by pin pairs with locally optimized configurations. The pins are arranged at specific positions and angles tailored to support different areas of the wafer uniformly, addressing local support needs rather than applying a uniform three-pin configuration across all wafers. This local quality approach mitigates bowing by ensuring even support distribution.
2Productivity
If pins are arranged to support multiple wafers on the plate, then batch processing capability is improved, but interference during wafer loading and unloading occurs
Solution Approach 1:
The pin pairs are arranged in asymmetric patterns with different orientations and positions rather than symmetric configurations. This asymmetric arrangement creates staggered support points that reduce interference between adjacent wafers during loading and unloading operations, while still maintaining the batch processing capability by supporting multiple wafers simultaneously on the same plate.
3Manufacturing precision
If pins are positioned to maximize wafer support coverage, then manufacturing precision is improved, but wafer bowing due to thermal expansion is deepened
Solution Approach 1:
The support configuration transitions from a two-dimensional planar arrangement to a three-dimensional spatial arrangement with pins positioned at different heights and orientations. This dimensional change allows the pin pairs to support the wafer in a manner that compensates for thermal expansion effects, maintaining wafer flatness while ensuring precise positioning for thin film deposition through the added spatial degrees of freedom.
Data Source
AI summary
A wafer boat according to an aspect of the present invention includes: at least one plate on which a plurality of wafers are loaded; and a plurality of pin pairs that are arranged along a first direction from the at least one plate and respectively support corresponding wafers among the plurality of wafers.