Pumping Ring Aperture Layout for Uniform CVD Chamber Exhaust
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Solution Overview
Problem
Existing semiconductor processing systems face challenges in maintaining uniform gas flow and preventing substrate defects due to large pressure transitions within processing chambers, which can lead to undesirable byproducts interacting with the substrate.
Innovation Solution
The implementation of a pumping ring with a flange that defines a plurality of apertures, where the apertures are arranged to alter the gas flow path vertically away from the substrate, minimizing the risk of substrate defects during pressure transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If gas is exhausted from the processing region during pressure transitions, then pressure control is improved, but undesirable byproducts may interact with the substrate causing defects
Solution Approach 1:
A flow diverter is introduced as an intermediary component between the exhaust outlet and the substrate. This flow diverter redirects the exhaust gas flow path so that gas flows vertically away from the substrate through the flow diverter structure, preventing direct interaction between exhaust byproducts and the substrate while maintaining effective pressure control
Solution Approach 2:
The exhaust gas flow is redirected from a horizontal path (parallel to substrate) to a vertical path (perpendicular to substrate) using the flow diverter. This dimensional change in flow direction ensures that exhaust byproducts are removed away from the substrate rather than allowing them to interact with the substrate surface
2Device complexity
If conventional pumping rings are used, then structure simplicity is maintained, but gas flow uniformity and substrate protection are compromised
Solution Approach 1:
The pumping ring is segmented into distinct functional sections: a flow diverter section with vertically oriented flow paths, and an exhaust outlet section. This segmentation allows each section to perform its specific function optimally - the flow diverter protects the substrate while the exhaust outlet maintains pressure control
Solution Approach 2:
The flow diverter acts as an intermediary structure within the pumping ring that modifies the gas flow pattern. It redirects horizontal flow to vertical flow, creating a protective barrier between the exhaust path and the substrate without requiring complete redesign of the pumping ring system
Data Source
AI summary
Gas distribution assemblies, processing chambers, and methods for processing substrates are provided. A substrate processing chamber includes a chamber body having a first end and a second end, a lid coupled to the first end of the chamber body, an isolator disposed on an upper surface of the lid, a faceplate disposed on an upper surface of the isolator, a substrate support disposed on a shaft extending through the second end of the chamber body, a pumping ring positioned within the chamber body, and an exhaust outlet in fluid communication with a system foreline and the plurality of apertures. The processing chamber defines a processing region between the substrate support and the faceplate. The pumping ring includes a flange extending in a plane generally parallel with a top surface of the substrate support that defines a plurality of apertures.