Adjustable Gas Separation Unit for Roll-to-Roll Deposition
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Solution Overview
Problem
Roll-to-roll deposition systems face challenges in achieving effective gas separation, leading to cross-contamination and process instability, especially when processing thinner films and lower drum temperatures, which results in increased costs and risk of mechanical failure due to inadequate adjustment of gas separation slits.
Innovation Solution
A modular deposition apparatus with a self-adjustable gas separation unit that can vary the slit width based on temperature changes, using actuators and sensors to maintain optimal gas separation while preventing mechanical contact with the rotating drum, allowing for improved gas separation factors and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the slit width is reduced to improve gas separation, then gas separation efficiency is improved, but the risk of mechanical contact between separation walls and coating drum increases
Solution Approach 1:
The gas separation unit is made dynamically adjustable through actuators that can change the slit width in real-time. This allows the system to optimize gas separation by reducing slit width when needed while preventing mechanical contact by increasing slit width when thermal expansion occurs, thus resolving the contradiction between gas separation efficiency and mechanical damage risk
Solution Approach 2:
Temperature sensors provide feedback on the coating drum temperature to the control system. When the temperature exceeds the predetermined threshold, the control system automatically adjusts the slit width to prevent mechanical contact. This feedback mechanism ensures gas separation efficiency is maintained under normal conditions while preventing damage under thermal expansion conditions
2Productivity
If multiple deposition sources with different gas mixtures are combined in a single apparatus, then productivity is improved, but cross-contamination risk increases
Solution Approach 1:
The deposition apparatus is segmented into multiple independent deposition sources, each with its own vacuum processing region and gas supply system. The gas separation unit with adjustable slit width creates effective barriers between these segments, preventing cross-contamination while allowing multiple processes to operate simultaneously. This segmentation enables high productivity while maintaining process stability
Solution Approach 2:
The adjustable gas separation unit acts as an intermediary barrier between deposition sources using different gas mixtures. By controlling the slit width, this intermediary structure prevents harmful gas cross-contamination between adjacent deposition regions while allowing the system to maintain high substrate throughput through parallel processing
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 solution enhances gas separation efficiency, reduces the risk of drum damage, and allows for the combination of multiple deposition processes in a single apparatus, increasing substrate throughput and reducing manufacturing costs by maintaining optimal gas separation across varying process conditions.
Implementation Method 1
at least one separation gas inlet (842) having one or more separation gas inlet openings (843), wherein the one or more separation gas inlet openings (843) are provided at opposing sides, with respect to the transport direction, of the surface of the electrode such that the processing gas inlet (612) and the processing gas outlet (614) are provided between the at least one separation gas inlet (842) and the surface of the electrode
Implementation Method 2
one or more vacuum flanges providing at least a further gas outlet between the first deposition source and the at least one second deposition source; wherein the pressure at the at least one vacuum outlet is smaller than the pressure in any area of the first deposition source and the at least one second deposition source
Data Source
Figure 1~2
Figure 3A~3B
Figure 4~5
AI summary
An apparatus for depositing a thin film on a substrate is described. The apparatus includes a substrate support having an outer surface for guiding the substrate along a surface of the substrate support through a first vacuum processing region and at least one second vacuum processing region, a first deposition sources corresponding to the first processing region and at least one second deposition source corresponding to the at least one second vacuum processing region, wherein at least the first deposition source includes: an electrode having a surface, wherein the surface of the electrode opposes the surface of the substrate support, a processing gas inlet and a processing gas outlet, wherein the processing gas inlet and the processing gas outlet are arranged at opposing sides of the surface of the electrode, and at least one separation gas inlet having one or more separation gas inlet openings, wherein the one or more separation gas inlet openings are at least provided at one of opposing sides of the surface of the electrode such that the processing gas inlet and/or the processing gas outlet are provided between the one or more separation gas inlet openings and the surface of the electrode. The apparatus further includes one or more vacuum flanges providing at least a further gas outlet between the first deposition source and the at least one second deposition source.