Coating Source Segmented Heating Prevents Outlet Deposition
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Solution Overview
Problem
Conventional coating sources for large-scale glass substrates and Si wafers suffer from material deposition at the outlet opening, leading to impaired coating quality and potential material adherence on the substrate surface, which is not effectively addressed by existing technologies.
Innovation Solution
A coating source with two independent heating sources, one for the crucible and coating material, and another for the outlet opening, allowing for controlled temperature management to prevent deposition and facilitate cleaning, using infrared radiation sources and a semi-transparent lid to ensure efficient energy transfer and prevent material condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single heating source is used for the crucible, then the coating material can be vaporized, but material deposits at the outlet opening impairing coating quality
Solution Approach 1:
The heating system is segmented into two independent heating sources: a first heating source for the crucible and coating material, and a second heating source for the outlet opening. This segmentation allows independent temperature control of different zones, preventing material deposition at the outlet opening while maintaining vaporization at the crucible, thereby resolving the contradiction between coating quality and material deposition.
Solution Approach 2:
Different regions of the coating source are assigned different thermal characteristics through localized heating. The outlet opening region is heated to a higher temperature than the crucible region, creating a temperature gradient that prevents condensation and deposition at the outlet. This local quality differentiation eliminates material deposition while preserving coating quality.
2Manufacturing precision
If the outlet opening is heated to prevent deposition, then coating quality improves, but energy consumption increases
Solution Approach 1:
The heating system is divided into two independently controllable heating sources, allowing energy to be applied selectively to only the regions where it is needed. The second heating source targets specifically the outlet opening to prevent deposition, while the first heating source maintains crucible temperature. This segmented approach minimizes overall energy consumption compared to heating the entire system uniformly.
Solution Approach 2:
The temperature parameters are optimized differently for different zones: the crucible is heated to the vaporization temperature of the coating material, while the outlet opening is heated to a higher temperature specifically to prevent condensation. This parameter differentiation ensures energy efficiency by applying only the necessary heating to each region, avoiding excessive energy consumption.
3Productivity
If the crucible is heated to vaporize coating material, then coating process can proceed, but material adheres to the substrate surface from the outlet opening
Solution Approach 1:
The heating system is segmented into two independent sources that can be controlled separately. The first heating source maintains the crucible at vaporization temperature to ensure continuous coating material supply, while the second heating source maintains the outlet opening at a temperature above the condensation point to prevent material adherence. This segmentation allows both coating productivity and substrate surface quality to be maintained simultaneously.
Solution Approach 2:
Different thermal conditions are applied to different locations: the crucible region is heated to enable vaporization for coating productivity, while the outlet opening region is heated to a higher temperature to prevent material adherence to the substrate. This local quality differentiation resolves the contradiction between maintaining coating process efficiency and preventing substrate contamination.
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
This design ensures uniform and clean coatings by preventing material deposition at the outlet opening and guide portion, allowing for effective cleaning and maintaining temperature control, thereby enhancing coating quality and preventing contamination during the process.
Implementation Method 1
The first and/or second IR radiation sources are preferably arranged outside said closed crucible, wherein the lid is at least semi-transparent for the IR radiation of the first and/or second IR radiation sources
Implementation Method 2
the lid is at least semi-transparent for the IR radiation of the first and/or second IR radiation sources... sufficient radiant energy from the IR radiation sources passes through the lid to the coating material or the outlet opening and, on the other hand, sufficient radiant energy is absorbed by the lid
Implementation Method 3
a crucible for vaporizing coating material and at least one outlet opening for vaporized coating material... the outlet opening is heated during the coating process to such an extent that a deposit of coating material in the region of the outlet opening can be effectively prevented
Data Source
AI summary
The present invention relates to a coating source for a coating plant, a coating plant with such a coating source and a method for coating substrates using such a coating source.