PECVD Coating Apparatus Substrate Positioning for Uniformity
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Solution Overview
Problem
Conventional coating apparatuses using PECVD processes face issues with excessive decomposition of coating forming materials due to direct exposure to plasma, leading to adverse effects on deposition velocity and uniformity of polymer coatings.
Innovation Solution
A coating apparatus and method where the substrate is positioned between the monomer discharge source and the plasma generation source, allowing the coating forming material to reach the substrate before being excited, thereby reducing excessive decomposition and enhancing the quality of the polymer coating by controlling the distance and movement of the substrate relative to both sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the substrate is placed between the discharge source and plasma generation source, then the coating forming material can reach the substrate before excessive decomposition occurs, but the deposition velocity and uniformity are adversely affected by excessive exposure to plasma
Solution Approach 1:
The substrate is made movable relative to both the discharge source and plasma generation source, allowing dynamic adjustment of distances during the coating process. This enables optimization of the balance between material transport and plasma exposure, resolving the contradiction between coating uniformity and deposition velocity
Solution Approach 2:
The invention changes the spatial parameters (distances) between substrate and sources, as well as temporal parameters (exposure time), to optimize the coating process. By adjusting these parameters, the system achieves both high uniformity and acceptable deposition velocity
2Reliability
If the coating forming material is exposed to plasma for excitation, then reactive precursor species are generated for polymer deposition, but excessive decomposition of the coating forming material occurs
Solution Approach 1:
The coating forming material is transported to the substrate before intense plasma exposure occurs. This preliminary action of material delivery precedes the excitation step, ensuring that monomer reaches the substrate in its intact form before any decomposition can occur
Solution Approach 2:
The substrate acts as an intermediary between the discharge source and plasma generation source. It receives the coating forming material from the discharge source before the material is exposed to the plasma generation source, thereby protecting the material from excessive decomposition
3Productivity
If the substrate is positioned closer to the plasma generation source for better coating formation, then polymer deposition is enhanced, but excessive decomposition and substrate damage occur
Solution Approach 1:
The substrate position is made dynamic rather than fixed, allowing it to move between different distance ranges from the plasma generation source during the coating process. This enables the system to achieve high deposition efficiency while avoiding excessive plasma exposure that would cause substrate damage
Solution Approach 2:
The coating process employs periodic alternation between phases of material transport and plasma exposure. During material transport phase, substrate is closer to discharge source; during plasma exposure phase, substrate is positioned to receive activated material without excessive plasma damage
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 configuration reduces material waste, improves the uniformity and quality of the polymer coating by minimizing decomposition, and allows for better control over the polymerization process, resulting in enhanced chemical integrity and performance of the coating.
Implementation Method 1
a plasma generation source for applying an electrical power to the coating forming material so as to excite the coating forming material
Implementation Method 2
A typical coating apparatus implementing a PECVD (Plasma Enhanced Chemical Vapor Deposition) process
Implementation Method 3
reactions between the reactive precursor species and the monomer, or between the reactive precursor species themselves take place and the polymer film is then deposited and formed on the surface of the substrate
Data Source
AI summary
A coating apparatus for coating a plurality of substrates includes a chamber body having a reaction chamber, a monomer discharge source having a discharge inlet for introducing a coating forming material into the reaction chamber of the chamber body, and a plasma generation source disposed at a central area of the reaction chamber of the chamber body for exciting the coating forming material, wherein the plurality of substrates is adapted for being arranged around the plasma generation source within the chamber body, so that the uniformity of the coatings formed on the surfaces of the substrates is enhanced, and the deposition velocity is increased.