Substrate Transfer Area Gas-Tight Seals for Purity Throughput
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Solution Overview
Problem
Conventional substrate processing systems face challenges in achieving high process purity and high production throughput, particularly in meeting the demands of advanced solar cell technology, as they are often limited by thermal processing capabilities and low production speeds due to design constraints such as batch furnaces and single-chamber systems.
Innovation Solution
A substrate processing system with a substrate reloading area that uses gas-tight seals and inert gas filling to maintain cleanliness, coupled with multiple carrier device planes and process chambers, allowing for efficient substrate transfer and processing across multiple levels, enabling high-quality substrate processing and increased production capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If batch furnaces are used for thermal processing, then process purity is improved, but production speed deteriorates due to long heating and cooling times
Solution Approach 1:
The system divides the processing into separate stages: batch processing in vacuum chambers for high-purity thermal treatment, and continuous loading/unloading in atmospheric chambers. This segmentation allows simultaneous high-purity processing and rapid substrate exchange, resolving the contradiction between process purity and production speed.
Solution Approach 2:
The invention introduces a temporal dimension by separating loading/unloading operations from processing operations in time and space. Substrates are pre-loaded in atmospheric chambers while other substrates are being processed in vacuum chambers, enabling continuous production without compromising processing purity or extending heating/cooling cycles.
2Productivity
If continuous coating systems are used, then production speed is improved, but process purity deteriorates due to contamination from gas curtains and open chambers
Solution Approach 1:
The system segments the continuous coating system into atmospheric loading chambers and vacuum processing chambers separated by gas-tight closures. This allows continuous substrate supply while maintaining pure processing environments, resolving the contradiction between production speed and process purity.
Solution Approach 2:
Gas-tight closure devices act as intermediaries between the atmospheric loading/unloading areas and the vacuum processing chambers. These closures enable continuous substrate transfer while preventing contamination, allowing high production speed without sacrificing process purity.
3Productivity
If substrate cassettes are used for mass production, then substrate throughput is improved, but device complexity increases due to multiple carrier device planes and reloading mechanisms
Solution Approach 1:
The atmospheric chambers serve multiple functions: substrate storage, pre-loading, and post-unloading. The carrier devices operate in both atmospheric and vacuum environments, and the gas-tight closures function as both seals and transfer interfaces. This multi-functionality increases throughput while limiting complexity growth.
Solution Approach 2:
The system uses automated carrier devices that self-load substrates from cassettes and self-transfer between chambers. The gas-tight closures automatically seal and unlock, and the vacuum system maintains pressure differententials without constant intervention. This automation increases throughput while reducing operational complexity.
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 system achieves enhanced process purity and high substrate throughput by maintaining a clean atmosphere and utilizing multiple processing levels, allowing for efficient handling and processing of substrates, thereby addressing the limitations of conventional systems in terms of cleanliness and production speed.
Implementation Method 1
a substrate processing system with a substrate reloading area that uses gas-tight seals and inert gas filling to maintain cleanliness
Implementation Method 2
A substrate transfer area is coupled to the substrate loading and unloading area. A gas-tight seal is provided between the substrate loading and unloading area and the substrate reloading area
Data Source
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AI summary
The invention relates to a substrate processing plant which has at least one substrate loading and unloading area for loading and unloading the substrate processing plant with at least one substrate, at least one evacuable process chamber, at least one carrier device with which the at least one substrate can be transported to the at least one process chamber by means of at least one carrier transport device in at least one carrier transport area, and at least one gas-tight sealing device between the at least one process chamber and the carrier transport area, as well as at least one gas-tight sealing device between the substrate loading and unloading area and the carrier transport area.The object of the present invention is to propose a substrate processing plant which allows high-quality substrate processing by providing high process purity and which is also suitable for mass production due to a large substrate throughput.The problem is solved by a substrate processing plant of the type defined above, which is characterized in that a substrate transfer area with a substrate transfer device for transferring the at least one substrate from at least one substrate cassette provided in the substrate loading and unloading area, in which substrates can be arranged in different horizontal cassette planes of the substrate cassette, to the at least one carrier device with which the at least one substrate can be held in a horizontal carrier plane is provided between the substrate loading and unloading area and the carrier transport area, wherein the substrate transfer area can be sealed gas-tight from both the substrate loading and unloading area and the carrier transport area.