Conductive Coating for Insulating Workpiece Plasma Processing
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Solution Overview
Problem
Insulating workpieces pose challenges during plasma processing due to charge buildup, which affects ion penetration and coating uniformity, particularly in thicker materials where negative charge impedes implant energy and repeatability.
Innovation Solution
A method involving the implantation of insulating workpieces with specific ion species to form hydrophobic or hydrophilic regions, followed by the deposition of a conductive coating that preferentially adheres to these regions, allowing for controlled plasma processing and uniform charge distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ion implantation is performed on insulating workpieces, then impurity material is introduced into the workpiece, but charge buildup occurs on the surface
Solution Approach 1:
A conductive coating layer is introduced as an intermediary between the ion source and the insulating workpiece. This coating layer accepts the ion implantation dose and allows the underlying insulating workpiece to remain electrically isolated while still receiving the desired impurity material, thus preventing charge buildup on the workpiece surface
Solution Approach 2:
The system is segmented into two distinct functional layers: a conductive coating layer that handles the plasma processing and ion implantation, and the insulating workpiece that receives the impurity material without direct plasma exposure. This segmentation allows each layer to perform its optimal function without the harmful effects of charge buildup on the workpiece
2Quantity of substance
If ion implantation is performed on thicker insulating workpieces, then impurity material is introduced, but ion penetration is prevented due to negative charge
Solution Approach 1:
The conductive coating acts as an intermediary that absorbs the ion implantation process, allowing ions to penetrate through the coating and reach the insulating workpiece without the coating itself becoming charged. This enables successful ion penetration into thicker insulating workpieces that would otherwise be blocked by charge buildup
3Productivity
If conventional plasma processing is applied to insulating workpieces, then processing is performed, but coating uniformity is compromised
Solution Approach 1:
The conductive coating is applied selectively to specific regions of the insulating workpiece where plasma processing is required. This localized application ensures that only the necessary areas receive the coating, allowing for uniform coating deposition in those regions while maintaining the insulating properties of the rest of the workpiece
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 approach enables effective plasma processing of insulating workpieces by managing charge distribution and ensuring uniform coating, enhancing ion penetration and coating uniformity, and allowing for precise control over implantation parameters and coating thickness.
Implementation Method 1
implanting a part of a surface of an insulating workpiece with a first ion species
Implementation Method 2
A conductive coating is deposited on the workpiece. The coating is preferentially formed on non-implanted regions adjacent the implanted regions
Data Source
AI summary
A surface of an insulating workpiece is implanted to form either hydrophobic or hydrophilic implanted regions. A conductive coating is deposited on the workpiece. The coating may be a polymer in one instance. This coating preferentially forms either on the implanted regions if these implanted regions are hydrophilic or on the non-implanted regions if the implanted regions are hydrophobic.