Multi-Facet Plasma Etching With Aligned ICP Cavities
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Solution Overview
Problem
Existing substrate processing technologies face challenges in achieving high throughput and quality when simultaneously processing multiple facets of substrates, particularly for hard disk drives, due to low etch removal rates and the complexity of applying capacitive coupling for biasing.
Innovation Solution
The use of multiple plasma cavities aligned to specific facets of a substrate within an inductively coupled plasma (ICP) station, along with magnetic flux to inhibit electron travel to grounded surfaces, enables simultaneous processing of multiple facets while maintaining plasma stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If capacitive coupling is used for biasing in plasma processing, then substrate processing can be achieved, but the device complexity increases and etch removal rates decrease
Solution Approach 1:
The patent replaces capacitive coupling (electrical system) with inductive coupling (electromagnetic system) for substrate biasing. The inductively coupled plasma source uses magnetic fields to couple energy to the plasma, eliminating the need for complex capacitive electrodes and wiring, thereby reducing device complexity while maintaining processing capability
Solution Approach 2:
The patent introduces an intermediary electromagnetic field as the mediator between the power source and the substrate. Instead of direct electrical contact through capacitive coupling, the electromagnetic field serves as the intermediary to transfer energy and achieve plasma generation and substrate processing, simplifying the overall system architecture
2Productivity
If multiple plasma cavities are used for simultaneous multi-facet processing, then productivity increases, but device complexity increases
Solution Approach 1:
The patent divides the processing system into multiple independent plasma cavities, each capable of processing a specific facet of the substrate simultaneously. This segmentation allows parallel processing of multiple surfaces, dramatically increasing productivity while each individual cavity remains relatively simple in design
Solution Approach 2:
The patent designs the plasma cavities to be universal components that can process different facets of substrates. Each cavity is configured to handle specific geometric features (flat surfaces, sidewalls, etc.), and the same basic cavity design can be replicated and adapted for different processing needs, managing complexity through standardization
3Stability of the object's composition
If magnetic flux is applied to inhibit electron travel, then plasma stability improves, but energy consumption increases
Solution Approach 1:
The patent optimizes the magnetic flux parameters (strength, distribution, configuration) to achieve the minimum necessary field intensity for stabilizing plasma while minimizing energy consumption. By carefully tuning magnetic field parameters, the system achieves plasma stability without excessive energy input
Solution Approach 2:
The patent applies magnetic flux locally in specific regions where plasma instability occurs, rather than uniformly throughout the entire chamber. This localized application of magnetic fields targets problem areas specifically, reducing overall energy consumption while maintaining plasma stability where needed
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 significantly enhances etch removal rates and processing efficiency, allowing for uniform and high-quality processing of both sides of substrates, such as hard disk drives, while preventing plasma instability and conductive shorts.
Implementation Method 1
inductively coupled plasma (ICP) station
Implementation Method 2
a magnetic field generator is positioned around the chamber to generate magnetic flux in an annular region of the chamber
Data Source
AI summary
In an apparatus and related method, a substrate that has multiple facets is held in a chamber of a plasma reactor that has multiple plasma cavities. The substrate is positioned by a transport arrangement with each plasma cavity of the plasma reactor aligned to a facet of the substrate. A plasma is generated in each plasma cavity, to apply simultaneous plasma processing to multiple facets of the substrate.