Plasma ALD Chamber Layout for Uniform Deposition and Low Contamination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing plasma-enhanced atomic layer deposition (ALD) reactors face challenges in improving processing efficiency and providing alternatives to existing technologies.
Innovation Solution
A substrate processing apparatus is designed with an inner chamber surrounded by an outer chamber, featuring a plasma system that provides plasma species from the top and includes a remote plasma generator for enhanced processing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plasma species are provided from the top side of the inner chamber, then processing efficiency is improved, but plasma distribution uniformity becomes challenging
Solution Approach 1:
The plasma system is segmented into multiple plasma sources positioned at different locations (top side and side walls) of the inner chamber. This segmentation allows plasma to be introduced from multiple directions, improving both processing efficiency and distribution uniformity across the substrate surface.
Solution Approach 2:
Different regions of the inner chamber receive plasma from different sources optimized for their specific needs. The top plasma source provides primary plasma flux to the substrate, while side wall sources ensure uniform plasma distribution along the chamber walls and corners, creating locally optimized plasma quality throughout the chamber.
2Temperature
If the inner chamber is completely surrounded by the outer chamber, then thermal insulation is improved, but access for substrate loading and cleaning becomes difficult
Solution Approach 1:
The outer chamber incorporates movable components including a rotatable substrate support and movable chamber walls or ports. These dynamic elements allow the chamber to transition between a sealed insulated state during processing and an open accessible state for substrate loading and cleaning operations.
Solution Approach 2:
The substrate support system is extracted from complete enclosure, allowing substrates to be loaded and unloaded from the inner chamber while the outer chamber remains partially open. This extraction of the loading path from the enclosed structure maintains thermal insulation during processing while enabling easy access during loading/unloading cycles.
3Object-generated harmful factors
If remote plasma generation is used, then contamination is reduced, but plasma species delivery efficiency decreases
Solution Approach 1:
The system uses an intermediary plasma generation zone located between the remote plasma source and the substrate. This intermediary zone allows plasma species to be generated remotely (reducing contamination) while maintaining a controlled environment that preserves plasma species density and delivery efficiency to the substrate.
Solution Approach 2:
Plasma species are generated in advance in a remote plasma source, allowing the main inner chamber to remain free of plasma generation contaminants. The pre-generated plasma species are then delivered through carefully designed gas flow paths that maintain their reactivity and delivery efficiency without introducing contamination during the deposition process.
4Adaptability or versatility
If the lower portion of the inner chamber extends outside the outer chamber, then substrate support flexibility is improved, but thermal loss increases
Solution Approach 1:
The extension of the inner chamber lower portion outside the outer chamber is designed with flexible thermal insulation layers or thin film thermal barriers. These flexible insulating structures maintain substrate support flexibility and positioning capability while minimizing thermal loss from the exposed chamber portion.
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
The apparatus achieves improved substrate processing by providing uniform plasma distribution, efficient purging, and low contamination, enabling high-quality film deposition and extended reactor utilization without manual cleaning.
Implementation Method 1
a plasma system to provide the inner chamber with plasma species from the top side of the inner chamber
Implementation Method 2
a heater in the outer chamber to heat the upper portion of the inner chamber
Implementation Method 3
a second plasma species is generated remotely. In certain embodiments, the remotely generated plasma species is fed via an in-feed line into the upper portion of the inner chamber
Data Source
AI summary
A substrate processing apparatus includes an inner chamber formed by an upper portion and a lower portion, a substrate support to support a substrate within the upper portion of the inner chamber, a plasma system to provide the inner chamber with plasma species from the top side of the inner chamber, and an outer chamber surrounding the upper portion of the inner chamber. The lower portion of the inner chamber extends to the outside of the outer chamber and remains uncovered by the outer chamber.