Bonded Showerhead Assembly for Corrosion-Resistant Processing
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Solution Overview
Problem
Existing showerhead assemblies in etch processing chambers degrade and corrode over time, leading to functional failures and potential unusability when components cannot be replaced due to their complexity.
Innovation Solution
A showerhead assembly design featuring a heat transfer plate with cooling channels and a heater, coupled with a showerhead plate and a gas distribution plate bonded by adhesive, allowing for easy replacement and reduced manufacturing costs through anodization and thinner gas distribution plate construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the showerhead assembly uses complex components to ensure functionality, then the processing chamber can operate effectively, but the components become difficult to replace when corroded
Solution Approach 1:
The showerhead assembly is divided into separate replaceable components including a showerhead plate, gas distribution plate, and heat transfer plate. Each component can be independently removed and replaced when corroded, eliminating the need to disassemble the entire complex assembly. The modular design allows simple snap-fit or screw-based connections that enable easy component swapping while maintaining full processing functionality.
2Strength
If the gas distribution plate is made thick to ensure structural integrity, then the component strength is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The gas distribution plate thickness parameter is optimized to a thinner specification that maintains sufficient structural integrity for the application. This parameter change reduces material consumption and manufacturing complexity while the plate still provides the necessary gas distribution functionality and structural support. The thinner plate is achieved through precision manufacturing processes that ensure uniform thickness and structural adequacy.
3Ease of manufacture
If the gas channels are not anodized to reduce manufacturing steps, then the manufacturing process is simplified, but the corrosion resistance deteriorates
Solution Approach 1:
The gas channels are anodized to create a protective oxide layer on the metal surface, forming a composite structure that combines the base metal with a corrosion-resistant anodized layer. This anodized coating provides excellent corrosion resistance against the harsh plasma environment while being applied through a standard anodizing process that integrates seamlessly into the manufacturing workflow. The anodized layer protects the gas channels from degradation without adding significant complexity to the overall manufacturing process.
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
Facilitates easy replacement of components and reduces manufacturing costs by using anodized gas channels and a thinner gas distribution plate, maintaining processing chamber functionality and efficiency.
Implementation Method 1
maintaining processing chamber functionality and efficiency through anodized gas channels
Implementation Method 2
heat transfer plate having cooling channels formed adjacent the first side of the heat transfer plate
Implementation Method 3
heater formed in the second side of the heat transfer plate
Data Source
AI summary
The present disclosure generally relate to a processing chamber comprising a showerhead assembly. The showerhead assembly comprises a heat transfer plate having a first side and a second side, the heat transfer plate having cooling channels formed adjacent the first side of the heat transfer plate and a heater formed in the second side of the heat transfer plate, a showerhead plate having a first side coupled to the second side the heat transfer plate, a first gas passageway extending through the heat transfer plate to the showerhead plate, and a gas distribution plate (GDP) bonded to a second side of the showerhead plate, the GDP having a first plurality of holes formed therethrough, first ends of the first plurality of holes open to the showerhead plate. The showerhead plate comprises a metal backing and a plurality of anodized gas paths extending within the metal backing.