PECVD Hydrophobic Coating with Hybrid Plasma Density Control
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Solution Overview
Problem
Existing plasma reaction devices, such as capacitive coupling plasma (CCP) and inductively coupled plasma (ICP), suffer from low plasma density and stability issues, leading to poor material processing quality and surface modification due to high electric potential and sputtering effects.
Innovation Solution
A PECVD coating system that combines inductive coupling and a bias electric field to generate plasma, utilizing an ICP generator and bias power supply to enhance plasma density and uniformity, allowing for the formation of organic hydrophobic coatings on various substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If capacitive coupling plasma device is used, then plasma can be generated, but plasma density is low (about 10^9/cm^3) and surface is easily bombarded by active ions
Solution Approach 1:
The patent combines inductive coupling and capacitive coupling methods into a hybrid plasma generation system. The inductive coupling coil generates a magnetic field that induces high-density plasma, while the capacitive coupling electrodes apply a controlled electric field. This merging of two plasma generation mechanisms achieves both high plasma density and controlled ion energy, resolving the contradiction between quantity of plasma and quality of surface treatment.
Solution Approach 2:
The patent changes the operating parameters by introducing radio frequency power to the inductive coupling coil and controlling the electric field strength between capacitive electrodes. By adjusting these parameters, the system achieves optimal plasma density while controlling ion bombardment energy, transforming the plasma characteristics from low-density/high-bombardment to high-density/controlled-bombardment.
2Quantity of substance
If inductively Coupled Plasma (ICP) is used, then high plasma density can be achieved, but electrostatic coupling effect causes sputtering of high-energy ions on the coil and discharge device
Solution Approach 1:
The patent introduces capacitive coupling electrodes as an intermediary element between the inductive coupling coil and the plasma. These electrodes serve as a buffer that controls ion acceleration and reduces direct ion-sputtering on the coil structure. The intermediary capacitive structure manages ion energy distribution, preventing harmful sputtering while maintaining high plasma density.
3Productivity
If conventional plasma processing is used, then material processing can be performed, but high temperature requires limited substrate materials
Solution Approach 1:
The patent changes the plasma generation parameters by using inductive coupling with radio frequency power, which generates plasma at lower temperatures compared to conventional capacitive coupling. This parameter change allows processing of temperature-sensitive materials like polymers (PC, PMMA, ABS) while maintaining effective coating deposition, thus expanding substrate material versatility without sacrificing processing capability.
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 high-density, stable plasma with directional ion acceleration, enabling the deposition of dense, transparent, and durable organic hydrophobic coatings on substrates at low temperatures, suitable for a wide range of polymer materials.
Implementation Method 1
an inductively coupled electric field promotes excitation to generate plasma
Implementation Method 2
a bias electric field ionizes a gas through a glow discharge effect
Implementation Method 3
forming an organic hydrophobic coating by means of plasma enhanced chemical vapor deposition
Data Source
AI summary
Provided in the present disclosure are a PECVD coating system and coating method. In the coating method, deposition is performed on a surface of a substrate by means of a PECVD coating device so as to form an organic hydrophobic membrane, and deposition and coating involve the steps of: (A) providing an inductively coupled electric field for a reaction cavity of the PECVD coating device by means of an ICP generator of the PECVD coating device, so as to form a coupled magnetic field; and (B) providing a bias electric field for the reaction cavity by means of a bias power supply of the PECVD coating device.