Chamber Bellows Coating for Corrosion Control
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Solution Overview
Problem
Semiconductor processing chambers face corrosion from high-temperature corrosive gases, leading to residual particle contamination in the chamber environment, which can adversely affect substrate quality and process integrity.
Innovation Solution
The implementation of chamber components with corrosion-resistant coatings such as polytetrafluoroethylene (PTFE), parylene C, diamond-like carbon, yttria stabilized zirconia, and alumina, applied to components like bellows and valve assemblies, to protect against corrosive gases and high temperatures, along with the use of shields and thermal barriers to mitigate contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high temperatures are used to achieve complete disassociation of process gases and strong film adhesion, then film quality and adhesion are improved, but chamber components suffer corrosion and generate residual particles
Solution Approach 1:
A corrosion-resistant coating is applied to chamber components as an intermediary barrier between the corrosive process environment and the base metal. The coating material (such as ceramic or metal alloy) withstands high temperatures and corrosive gases, preventing direct attack on the underlying chamber component while allowing the process to proceed at elevated temperatures for optimal film quality.
Solution Approach 2:
The chamber component is constructed as a composite structure with a corrosion-resistant coating layer over a metallic substrate. This composite approach combines the high-temperature stability and corrosion resistance of ceramic or specialized coating materials with the mechanical strength and thermal conductivity of metal, enabling operation at high temperatures without component degradation.
2Productivity
If continuous operation is maintained to increase productivity, then output is improved, but residual particle concentration in the chamber increases
Solution Approach 1:
The corrosion-resistant coating on chamber components provides self-protection by preventing the generation of residual particles during continuous operation. The coating acts as a sacrificial or durable barrier that prevents base metal corrosion and particle generation, allowing the chamber to operate continuously without accumulating harmful residues from component degradation.
Solution Approach 2:
The corrosion-resistant coating is applied in advance to chamber components before operation begins. This preliminary protective measure prevents the generation of residual particles during continuous operation, eliminating the need for frequent chamber cleanings and enabling sustained high productivity without quality degradation.
3Reliability
If corrosion-resistant coatings are applied to chamber components, then component protection is improved, but device complexity increases
Solution Approach 1:
The corrosion-resistant coating serves multiple functions simultaneously: it protects against chemical corrosion from process gases, withstands high operating temperatures, prevents residual particle generation, and may provide thermal insulation. This multi-functionality justifies the added complexity by delivering multiple benefits from a single modification to the chamber component.
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 coatings significantly reduce the formation of unwanted byproducts and contamination within the chamber environment, enhancing the quality of films deposited on substrates and extending the lifespan of chamber components by preventing corrosion.
Implementation Method 1
The coating includes of at least one of polytetrafluoroethylene (PTFE), parylene C, parylene D, diamond-like carbon, yttria stabilized zirconia, alumina, or aluminum silicon magnesium yttrium oxygen compound
Data Source
AI summary
Implementations described herein protect a chamber components from corrosive cleaning gases used at high temperatures. In one embodiment, a chamber component includes at least a bellows that includes a top mounting flange coupled to a bottom mounting flange by a tubular accordion structure. A coating is disposed on an exterior surface of at least the tubular accordion structure. The coating includes of at least one of polytetrafluoroethylene, parylene C, parylene D, diamond-like carbon (DLC), yttria stabilized zirconia, nickel, alumina, or aluminum silicon magnesium yttrium oxygen compound. In one embodiment, the chamber component is a valve having an internal bellows.