Suction Cup Wafer Transfer Between Mismatched Carriers
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Solution Overview
Problem
Existing loading and unloading systems for photovoltaic production face challenges in increasing capacity while maintaining coating uniformity and film thickness, particularly in transferring wafers between different carriers like cassettes and carrying boats.
Innovation Solution
A loading and unloading system with a carrying boat and cassette, utilizing a suction cup assembly that includes multiple suction cup groups and a driving mechanism to transfer wafers efficiently between these carriers, allowing for varying wafer capacities and orientations, and a support assembly to facilitate wafer placement and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of rows in the carrying boat is increased to boost capacity, then the wafer carrying capacity is improved, but coating uniformity and film thickness become uneven
Solution Approach 1:
The carrying boat is divided into multiple independent stations (first station, second station, third station, fourth station) along the length direction, with each station capable of carrying wafers independently. This segmentation allows the system to handle different wafer quantities at different stations, maintaining coating uniformity while increasing overall capacity through parallel processing capabilities.
2Adaptability or versatility
If multiple different carriers are used for different operations, then process requirements are met, but wafer transfer operations become frequent and complex
Solution Approach 1:
The carrying boat is designed with a universal structure that can accommodate different types of wafers and work with various process equipment. The standardized station design with uniform clamping mechanisms allows the same carrying boat to be used across different operations (deposition, annealing, etc.), reducing the need for multiple specialized carriers and simplifying wafer transfer operations.
3Quantity of substance
If stations are stacked along the length direction to increase capacity, then wafer capacity is improved, but the system footprint increases
Solution Approach 1:
Instead of stacking stations only along the length direction (one dimension), the carrying boat utilizes both the length direction and width direction for station arrangement. Multiple stations are distributed across the surface area of the carrying boat, creating a two-dimensional layout that increases capacity without proportionally increasing the system footprint.
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
Enhances wafer loading efficiency and system capacity by enabling flexible wafer transfer and alignment, improving coating uniformity and reducing system footprint.
Implementation Method 1
a suction cup assembly that includes a plurality of suction cups and a driving mechanism
Data Source
AI summary
A loading and unloading system, a carrying boat, and a suction cup assembly are provided. The loading and unloading system includes a carrying boat, a cassette, and a suction cup assembly. The suction cup assembly is configured to transfer wafers between the carrying boat and the cassette. The carrying boat includes multiple stations defined along a first direction. Each station is configured to accommodate M wafers. The cassette is configured to accommodate N wafers. M and N are not equal.