ALD Plasma Electrode Segmentation for Substrate Coating
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Solution Overview
Problem
In atomic layer deposition (ALD) processes, the limited reactivity of active precursor radicals formed in remote plasma leads to decreased efficiency, and existing apparatuses suffer from precursor reactions occurring on surfaces other than the substrate, causing contamination and increased downtime for cleaning.
Innovation Solution
A method and apparatus where a specific reaction zone is defined within the reaction chamber, with a plasma discharge electrode positioned to generate active precursor radicals only within this zone, preventing precursors from reacting outside the coating area and thus maintaining the apparatus clean.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If remote plasma is used to generate active precursor radicals, then the substrate can be coated with ALD, but the active precursor radicals lose reactivity before reaching the substrate, decreasing process efficiency
Solution Approach 1:
The reaction chamber is segmented into distinct zones: a plasma generation zone where precursors are activated, and a substrate treatment zone where coated deposition occurs. This spatial segmentation allows radicals to be generated close to the substrate without requiring long-distance transport, maintaining reactivity while enabling efficient coating.
Solution Approach 2:
A plasma discharge electrode acts as an intermediary element between the precursor supply and the substrate. The electrode generates plasma that activates precursors in situ within the reaction chamber, serving as a mediator that converts inactive precursors into reactive species right at the coating location, eliminating the need for remote plasma transport.
2Productivity
If precursors are supplied into the reaction chamber, then the substrate coating can proceed, but precursors react on apparatus surfaces outside the substrate area, causing contamination and increased cleaning downtime
Solution Approach 1:
The reaction chamber is designed with localized reaction zones where precursor activation and deposition are confined to specific areas. By controlling plasma discharge location and precursor flow paths, the system ensures that chemical reactions occur only in the designated substrate coating region, preventing unwanted film formation on other chamber surfaces and eliminating cleaning requirements.
Solution Approach 2:
The apparatus is divided into functionally distinct segments: a reaction zone for controlled precursor activation, a substrate support area for coating deposition, and separate gas inlet/outlet pathways. This segmentation prevents precursor leakage and unintended reactions on apparatus surfaces, maintaining continuous operation without cleaning interruptions.
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 reduces interruptions in use by preventing precursor contamination in the apparatus, enhancing the efficiency of the ALD process by ensuring that the coating only occurs on the substrate surface, while keeping other parts of the apparatus free from film deposition.
Implementation Method 1
generating plasma discharge to the reaction zone with the plasma discharge electrode for forming active precursor radicals from the second precursor supplied into the reaction zone
Data Source
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AI summary
The invention relates to a method and an apparatus of coating a substrate (1) by subjecting a surface of the substrate (1) to successive surface reactions of a first precursor and a second precursor according to the principles of atomic layer deposition in a reaction chamber (2). The method comprises the steps of arranging the substrate (1) to the substrate support (2c) in the reaction zone (5); supplying a predetermined amount of the first precursor via the gas inlet (20) to the reaction chamber (2) for providing a flow of the first precursor to the reaction zone (5) such that the first precursor is depleted by the end of the second end (2b); supplying the second precursor via the gas inlet (20) to the reaction chamber (2) for providing a flow of the second precursor through the reaction zone (5) and discharging the second precursor from the reaction chamber (2) via the gas outlet (21), the second precursor being inactive to react with the first precursor; generating plasma discharge to the reaction zone (5) with the plasma discharge electrode (4) for forming active precursor radicals from the second precursor supplied into the reaction zone (5) during the flow of the second precursor through the reaction zone (5), the active precursor radicals being active to react with the first precursor.