Thermal Evaporation Substrate Actuator for Large-Area Coating
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Solution Overview
Problem
Conventional thermal evaporation systems face challenges in coating large areas efficiently without contaminating the coating, as they require opening the reaction chamber, which increases processing time and risks contamination.
Innovation Solution
A thermal evaporation system with a substrate holder and actuator that moves the substrate relative to the source within the reaction chamber, allowing for continuous coating of large areas without opening the chamber, while preventing deposition on the chamber window by positioning the substrate between the source and the chamber window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the substrate is spatially fixed and the distance between source and coating area is maximized, then large area coating is enabled, but the reaction chamber must be opened which increases contamination risk and processing time
Solution Approach 1:
The substrate is made movable relative to the source through a substrate holder with actuator, allowing the substrate to be dynamically repositioned within the reaction chamber. This enables large area coating by moving different portions of the substrate through the coating region without opening the chamber, thus maintaining vacuum integrity and preventing contamination.
Solution Approach 2:
The solution introduces movement in the spatial dimension by enabling substrate translation relative to the source. Instead of fixing the substrate at a single position, the substrate can be moved along a path that brings different areas into the coating region, effectively expanding the coating area while maintaining a closed chamber system.
2Area of stationary object
If the substrate is spatially fixed and the distance between source and coating area is maximized, then large area coating is enabled, but processing time increases due to chamber opening requirements
Solution Approach 1:
The coating process is made continuous by enabling substrate movement within the closed reaction chamber. Different portions of the substrate can be sequentially brought into the coating region without interrupting the vacuum environment or opening the chamber, allowing uninterrupted deposition and significantly reducing processing time compared to batch processing requiring chamber openings.
3Manufacturing precision
If the substrate is positioned to receive coating material, then coating is achieved, but chamber window contamination occurs due to deposition on the window
Solution Approach 1:
The substrate is repositioned into the direct line of sight between the source and chamber window, creating a geometric arrangement where coating material preferentially deposits on the substrate rather than the window. This spatial rearrangement uses the line-of-sight geometry to redirect the deposition flux onto the substrate surface, preventing window contamination while maintaining coating quality.
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
Enables efficient and contamination-free coating of large areas by maintaining the reaction chamber closed during the process, reducing processing time and extending the system's service life by preventing chamber window contamination.
Implementation Method 1
coating a coating region on a front surface of a substrate with a source material thermally evaporated and/or sublimated from a source by electromagnetic radiation
Implementation Method 2
coating a coating region on a front surface of a substrate with a source material thermally evaporated and/or sublimated from a source by electromagnetic radiation
Implementation Method 3
a chamber window for coupling the electromagnetic radiation provided as one or more incident radiation beams into the reaction chamber
Data Source
AI summary
The present invention relates to an apparatus (100) for a thermal evaporation system (200) and to a thermal evaporation system (200), respectively, for coating a coating region (58) on a front surface (56) of a substrate (50) with a source material (40) thermally evaporated and/or sublimated from a source (30) by electromagnetic radiation (80). Further, the present invention relates to a method coating a coating region (58) on a front surface (56) of a substrate (50) with a source material (40) from a source (30) thermally evaporated and/or sublimated by electromagnetic radiation (80).