Modular ALD Reactor for Uniform Film Thickness
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Solution Overview
Problem
Current batch Atomic Layer Deposition (ALD) reactors face limitations in increasing deposition throughput and efficient processing of substrates, particularly in pre-heating and post-cooling processes, which affect the uniformity and thickness of deposited thin films.
Innovation Solution
A method and apparatus for processing a batch of substrates using a modular ALD system with a pre-processing module for pre-heating, a reaction chamber module for ALD processing, and a post-processing module for cooling, where substrates are transported in a continuous line with integrated loading and unloading mechanisms, allowing for simultaneous processing of substrate subsets with dedicated gas flow, enhancing heat transport through raised pressure using inactive gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If batch ALD processing is used to increase deposition throughput, then productivity is improved, but manufacturing precision deteriorates due to non-uniform heating and cooling across substrates
Solution Approach 1:
The batch of substrates is divided into multiple substrate subsets, with each subset processed independently in separate reaction zones within the reaction chamber. This segmentation allows for localized control of deposition parameters while maintaining batch processing capability, thereby improving film thickness uniformity without sacrificing productivity
Solution Approach 2:
Different regions of the reaction chamber are provided with independent gas flow paths and heating/cooling control, allowing each substrate subset to receive optimized local conditions. This ensures uniform pre-heating and cooling across all substrates while maintaining high throughput batch processing
2Productivity
If substrates are pre-heated and post-cooled in the same chamber to save time, then productivity is improved, but manufacturing precision deteriorates due to contamination and non-uniform temperature control
Solution Approach 1:
The system is divided into functionally separate modules: a pre-processing module for pre-heating, a reaction chamber module for ALD deposition, and a post-processing module for cooling. This segmentation allows each module to be optimized for its specific function, ensuring uniform temperature control while maintaining efficient batch processing throughput
Solution Approach 2:
Inactive gas serves as an intermediary medium to transport heat uniformly across substrate subsets during pre-heating and cooling phases. The gas flow paths are specifically designed to ensure even heat distribution, maintaining temperature uniformity while enabling efficient thermal processing
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 improves deposition throughput by ensuring uniform pre-heating and cooling, resulting in dense, pinhole-free, and uniformly thick thin films with reduced non-uniformity, such as aluminum oxide or Zn1-xMg xO/ZnO1-xSx buffer layers on solar cell structures.
Implementation Method 1
a pre-processing module for pre-heating
Implementation Method 2
a post-processing module for cooling
Implementation Method 3
enhancing heat transport through raised pressure using inactive gases
Implementation Method 4
The basic growth mechanism of ALD relies on the bond strength differences between chemical adsorption (chemisorption) and physical adsorption (physisorption). ALD utilizes chemisorption and eliminates physisorption during the deposition process.
Data Source
Figure 1A~1C
Figure 1D~1F
Figure 1G~1J
AI summary
The invention relates to a method that includes providing a reaction chamber module of an atomic layer deposition reactor for processing a batch of substrates by an atomic layer deposition process, and loading the batch of substrates before processing into the reaction chamber module via a different route than the batch of substrates is unloaded after processing. The invention also relates to a corresponding apparatus.