Two-Chamber ALD Layout for Cleaner Thin Film Deposition
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Solution Overview
Problem
Existing atomic layer deposition (ALD) processes face issues with incomplete evacuation of precursors, leading to contamination of substrates due to reactions on chamber surfaces, necessitating frequent cleaning and affecting product yield.
Innovation Solution
A method and system utilizing two separate chambers for precursor adsorption and reactant reaction, with energy sources to facilitate adsorption and reaction, ensuring reactions occur only on the substrate surface, eliminating contamination scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single chamber is used for ALD process, then the device complexity is reduced, but contamination occurs due to incomplete precursor evacuation leading to film formation on chamber surfaces
Solution Approach 1:
The single chamber is divided into two separate chambers: a first chamber for precursor adsorption and a second chamber for reactant reaction. This segmentation prevents precursor contamination on chamber surfaces by ensuring that reactions occur only in the second chamber where precursors are properly evacuated before reactant introduction.
2Productivity
If frequent chamber cleaning is performed to remove contamination, then product yield is maintained, but productivity decreases due to process interruptions
Solution Approach 1:
The harmful function of precursor reacting on chamber surfaces is eliminated by extracting the reaction process from the first chamber to the second chamber. The second chamber is specifically designed for reactant introduction and reaction, ensuring that no precursor-related contamination occurs on its surfaces, thereby eliminating the need for frequent cleaning.
3Manufacturing precision
If energy is supplied to facilitate reaction between reactant and precursor, then manufacturing precision of thin film is improved, but energy consumption increases
Solution Approach 1:
The precursor is pre-adsorbed on the substrate surface in the first chamber before the substrate is transported to the second chamber for reactant reaction. This preliminary action ensures that the precursor is already positioned on the substrate, allowing energy to be applied only where needed (on the substrate surface) rather than throughout the entire chamber, thus improving energy efficiency while maintaining manufacturing precision.
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
Reduces the need for frequent chamber cleaning, enhances product yield by preventing film formation on chamber surfaces, and allows for controlled, uniform thin film formation with improved thermal budget control and reduced byproducts.
Implementation Method 1
feeding a precursor into the first chamber, the precursor being adsorbed on a top surface of the substrate
Implementation Method 2
supplying energy to at least a part of the top surface of the substrate to facilitate reaction between the reactant and the precursor, thereby forming a thin film on the top surface
Data Source
AI summary
A method for implementing a thin film deposition process includes: transporting a substrate into a first chamber; feeding a precursor into the first chamber, the precursor being adsorbed on a top surface of the substrate; supplying radiant energy to at least a part of the top surface of the substrate to facilitate reaction between the precursor and the top surface of the substrate; transporting the substrate with the top surface being precursor-adsorbed into a second chamber that is separated from the first chamber and that is spatially isolated from the first chamber; feeding a reactant into the second chamber, wherein reaction between the reactant and the precursor results in a thin film forming on the top surface.