Roll-to-Roll PEALD Nozzle Layout Without Purge Cycles
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Solution Overview
Problem
Current roll-to-roll (R2R) atomic layer deposition (ALD) techniques are inefficient and costly due to the need for purge cycles, exposure to plasma or ion bombardment, mechanical damage from rollers, and high complexity, especially in achieving high-throughput and high-quality films.
Innovation Solution
The implementation of a continuous-flow R2R ALD system using electron cyclotron resonance (ECR)-enhanced hollow cathode plasma sources (HCPS) with ceramic plugs to prevent plasma damage, allowing for self-limiting ALD reactions on flexible substrates without purge cycles, and the use of infrared heating for enhanced film deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional R2R ALD techniques are used, then film deposition can be achieved, but the process requires purge cycles which reduce productivity and increase complexity
Solution Approach 1:
The patent implements continuous precursor flow through the reaction chamber without interruption for purging. The precursor flow continues throughout the deposition process, eliminating the need for separate purge cycles and enabling continuous operation that increases productivity while reducing process complexity
Solution Approach 2:
The patent uses periodic modulation of precursor flow rates or composition to achieve self-limiting surface reactions. By varying the precursor supply in a periodic manner, the system maintains continuous operation while controlling the deposition rate and film quality without requiring complete process interruption
2Productivity
If plasma is used to enhance ALD reactions, then deposition rate and film quality improve, but plasma or ion bombardment causes damage to the substrate
Solution Approach 1:
The patent introduces a buffer gas or neutral species that acts as an intermediary between the plasma and substrate. This intermediary absorbs or redirects the harmful plasma and ion bombardment while allowing the beneficial chemical reactions to proceed, thereby protecting the substrate from damage
Solution Approach 2:
The patent converts the harmful plasma and ion bombardment into beneficial effects by controlling the plasma parameters and composition. The plasma is used to activate precursors and enhance surface reactions, while the damaging effects are minimized through optimized process conditions that transform the harmful energy into useful chemical activation
3Productivity
If mechanical rollers are used to transport flexible substrates, then continuous processing is enabled, but mechanical damage occurs to the substrate or deposited films
Solution Approach 1:
The patent replaces mechanical roller contact with a non-contact transport mechanism such as magnetic levitation, electrostatic suspension, or air bearing. This substitution eliminates direct mechanical contact that causes damage while maintaining continuous substrate movement through the deposition chamber
Solution Approach 2:
The patent uses a flexible support film or carrier that can be transported without rigid mechanical contact. The flexible substrate is handled in a way that distributes mechanical stresses and avoids concentrated loads that would damage the substrate or deposited films
4Manufacturing precision
If multiple ALD sequences are performed to achieve high-quality films, then film quality improves, but processing time and complexity increase
Solution Approach 1:
The patent performs multiple ALD sequences in continuous operation without interruption between cycles. The precursor flow and substrate transport continue uninterrupted, allowing multiple deposition cycles to be completed in the time it would take to complete a single cycle with traditional start-stop operation, thereby reducing total processing time
Solution Approach 2:
The patent combines multiple ALD sequences into a single continuous process where precursor flows and reaction conditions are optimized to achieve the cumulative effect of multiple cycles in one uninterrupted operation. This merging of sequences reduces the overhead time and complexity associated with multiple separate processing steps
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 high-throughput, low-cost, and low-complexity R2R plasma-enhanced ALD (PEALD) or thermal ALD, reducing mechanical and plasma damage, eliminating the need for purge cycles, and achieving uniform, high-quality ALD films like AlN, Al2O3, and SiO2 across the entire substrate width.
Implementation Method 1
The implementation of a continuous-flow R2R ALD system using electron cyclotron resonance (ECR)-enhanced hollow cathode plasma sources (HCPS)
Implementation Method 2
allowing for self-limiting ALD reactions on flexible substrates without purge cycles, and the use of infrared heating for enhanced film deposition
Implementation Method 3
the use of infrared heating for enhanced film deposition
Implementation Method 4
Atomic layer deposition (ALD) is a special type of chemical vapor deposition (CVD) technique. ALD utilizes a sequential exposure of gaseous reactants for the deposition of atomically sized thin films
Data Source
AI summary
Techniques are disclosed for roll-to-roll (R2R) atomic layer deposition (ALD). R2R ALD is accomplished by arranging precursor nozzles in A/B pairs while a flexible web substrate moves underneath the A/B pairs at a uniform speed. Nozzles A of the A/B pairs continuously flow a precursor A into the process volume of the R2R ALD chamber. The plasma enhanced/activated ALD (PEALD/PAALD) embodiments utilize electron cyclotron resonance or rotation (ECR)-enhanced hollow cathode plasma sources (HCPS) where nozzles B flow activated neutrals of precursor B into the process volume. As the flexible web moves in an R2R motion, nucleates from precursor A deposited on the surface of the substrate, and neutrals of precursor B undergo a self-limiting reaction to deposit a single atomically sized ALD film/layer. In this manner, multiple ALD layers may be deposited by each successive A/B pair in a single pass of the web. There is also a heat source underneath the web to further facilitate the ALD reaction, or to support thermal ALD embodiments.