Deposition Confinement Chamber Layout for Cleaner Semiconductor Processing
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Solution Overview
Problem
Existing semiconductor processing systems face challenges in achieving uniform material deposition and efficient cleaning due to deposition of materials on chamber components and edge/backside regions of substrates, which can lead to increased cleaning times and potential corrosion.
Innovation Solution
The system includes a chamber body with a substrate support and isolators that define an exhaust path, along with a pumping liner and a fluid source for nitrogen or oxygen, which creates a gas distribution path to isolate deposition precursors and byproducts from the processing region and limits diffusion into chamber components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If precursors are delivered to a processing region for uniform deposition, then material deposition uniformity is improved, but deposition on chamber components and edge/backside regions increases
Solution Approach 1:
The processing chamber is segmented into distinct regions: a processing region above the substrate support where deposition occurs, and a separate exhaust path region below the substrate support where deposition byproducts are removed. The isolators create a physical segmentation that prevents precursor diffusion from the processing region to chamber components, while the exhaust path segments the removal function from the deposition function.
Solution Approach 2:
The exhaust path is extracted as a separate, dedicated pathway below the substrate support, distinct from the main processing region. This extracted exhaust path specifically handles the removal of deposition byproducts and purge gas, separating the deposition function from the exhaust function to prevent byproduct accumulation on chamber components.
2Reliability
If deposition byproducts accumulate on chamber components, then cleaning requirements increase, but cleaning time and complexity increase
Solution Approach 1:
The exhaust path is configured to continuously remove deposition byproducts and purge gas during the deposition process itself, performing the cleaning function preliminarily before byproducts can accumulate on chamber components. This preliminary action prevents the need for extensive post-deposition cleaning operations.
Solution Approach 2:
The exhaust function is extracted as a separate pathway that removes deposition byproducts before they can contaminate chamber components. By taking out the exhaust function into a dedicated path below the substrate support, the system prevents byproduct accumulation on components, thereby reducing cleaning requirements and time.
3Ease of operation
If the chamber design allows access for substrate support, then substrate processing is enabled, but deposition precursors can diffuse to edge and backside regions
Solution Approach 1:
The isolators are positioned to create localized control zones: a processing region with controlled precursor distribution above the substrate support, and a separate exhaust region below the substrate support. This local quality differentiation ensures that precursors are confined to where they are needed for deposition while preventing diffusion to edge and backside regions through the isolator barriers.
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 configuration improves process uniformity by limiting deposition on chamber components and enhances cleaning operations by reducing the need for extensive cleaning in recessed regions, thereby increasing throughput and reducing the risk of component corrosion.
Implementation Method 1
The fluid source may include nitrogen or oxygen. The methods may include flowing a purge gas through a gap defined between a substrate support and an isolator seated on a pumping liner within the processing region
Implementation Method 2
The methods may include forming a plasma of a deposition precursor in a processing region of a semiconductor processing chamber
Implementation Method 3
The one or more isolators may define an exhaust path between the one or more isolators and the chamber body. The exhaust path may extend to the base of the chamber body
Data Source
AI summary
Exemplary semiconductor processing systems may include a chamber body including sidewalls and a base. The system may include a substrate support extending through the base of the chamber body. The chamber body may define an access circumferentially extending about the substrate support at the base of the chamber body. The system may include one or more isolators disposed within the chamber body. The one or more isolators may define an exhaust path between the one or more isolators and the chamber body. The exhaust path may extend to the base of the chamber body. The systems may include a fluid source fluidly coupled with the chamber body at the access extending about the substrate support.