Ceramic-Coated Quartz Lid Geometry for Chamber Particle Reduction
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Solution Overview
Problem
In semiconductor processing, reducing particle contamination within processing chambers is challenging due to the generation of by-products like polymers during etching processes, which can lead to defects in integrated circuits, and the need for plasma-exposed components to be resistant to corrosive and erosive gases and plasma.
Innovation Solution
A lid for a substrate processing chamber with a central opening having a tapered profile and a trench, coated with yttrium oxide ceramic, and a spacer ring to reduce particle generation, combined with a gas coupling insert with a conical flange, minimizes particle contamination by ensuring smooth gas flow and reducing contact between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lid design is used in the processing chamber, then the structure is simple and easy to manufacture, but particle contamination increases due to by-products generated during etching processes
Solution Approach 1:
The lid is segmented into multiple functional zones: a tapered central opening section, an annular trench section, and a coated surface section. Each segment serves a specific purpose in particle control - the tapered section directs gas flow, the trench traps particles, and the coating provides chemical resistance, collectively reducing particle contamination without requiring complete redesign of the entire lid structure.
Solution Approach 2:
A ceramic coating layer is applied as an intermediary substance on the lid surface, particularly in the trench area. This coating layer acts as a mediator that prevents particle adhesion to the lid surface and provides resistance against corrosive process gases and plasma, thereby reducing particle generation while maintaining structural simplicity.
2Reliability
If the lid components are exposed to corrosive process gases and plasma, then the processing capability is maintained, but the components suffer from chemical attack and erosion
Solution Approach 1:
The lid employs a composite structure combining the base lid material with a ceramic coating layer. The ceramic coating provides exceptional chemical resistance to corrosive process gases and plasma, while the underlying lid structure maintains mechanical strength. This composite approach allows the components to withstand chemical attack and erosion while preserving structural integrity and durability.
3Reliability
If a tapered central opening profile is implemented, then gas flow is improved and particle generation is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The tapered central opening uses specific geometric parameters - a controlled taper angle and defined transition zones - to optimize gas flow patterns. By carefully selecting these parameters, the design achieves effective particle generation reduction through improved gas flow dynamics while keeping the taper angle within manufacturable ranges that balance performance with manufacturing precision capabilities.
4Reliability
If a trench with recess is formed in the lid surface, then particle trapping is enhanced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The trench design extracts and isolates particle-prone areas by creating a recessed annular channel that separates the gas flow path from the lid surface. This extraction of the particle-trapping function into a dedicated trench structure allows particles to be confined and removed from the main processing area, enhancing particle trapping capability while using a relatively simple annular groove geometry that is manageable with standard manufacturing processes.
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 solution effectively reduces particle generation and contamination within the processing chamber, enhancing the resistance of components to corrosive gases and plasma, thereby improving the reliability and efficiency of semiconductor fabrication processes.
Implementation Method 1
a ceramic coating deposited on a second surface of the chamber lid... plasma-exposed components of such apparatuses to be resistant to chemical attack when exposed to such gases and plasma
Data Source
AI summary
Embodiments of the present disclosure include methods and apparatuses utilized to reduce particle generation within a processing chamber. In one or more embodiments, a lid for a substrate processing chamber is provided and includes a cover member, a central opening, and a trench. An inner profile of the central opening contains a first section having a first diameter, a second section having a second diameter, and a third section having a third diameter. The second section is disposed between and connected to the first section and the third section. The first diameter gradually increases from the second section toward the surface of the cover member, the second diameter cylindrically extends from the first section to the third section, and the third diameter is less than the second diameter. The trench surrounds the central opening and is formed along a closed path in the surface of the cover member.