Cooled Showerhead Faceplate for Substrate Processing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Showerheads in substrate processing systems are not cooled during deposition and cleaning processes, leading to premature film flaking and increased defects, which results in frequent cleaning cycles and reduced substrate processing capacity and showerhead lifespan.
Innovation Solution
A cooled showerhead design with coolant channels within the faceplate, connected to a coolant assembly and temperature controller, which maintains the showerhead at a predetermined temperature during both deposition and cleaning processes, preventing premature film flaking and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the showerhead is not cooled during deposition and cleaning processes, then the structure remains simple and manufacturing is easier, but premature film flaking occurs and defects increase
Solution Approach 1:
The showerhead is segmented into multiple functional zones with separate coolant channels distributed across the faceplate. This segmentation allows different regions to be cooled independently, preventing thermal gradients that cause film flaking while maintaining a manageable structural complexity through modular channel design.
Solution Approach 2:
Coolant channels are strategically positioned at specific locations on the faceplate where heat accumulation is most problematic. This local quality approach applies cooling only where needed rather than uniformly across the entire showerhead, preventing film flaking at critical areas while minimizing overall structural complexity.
2Productivity
If the showerhead is not cooled during deposition processes, then the manufacturing process is simpler, but cleaning frequency increases due to premature film flaking
Solution Approach 1:
The coolant channels are pre-integrated into the showerhead faceplate during manufacturing, establishing the cooling capability before the showerhead enters service. This preliminary action prevents film flaking from occurring in the first place, thereby maintaining high substrate processing capacity without requiring complex post-manufacturing modifications or frequent cleanings.
Solution Approach 2:
The introduction of coolant channels changes the thermal parameter of the showerhead faceplate, maintaining it at a controlled temperature during deposition. This parameter change prevents film flaking and reduces cleaning frequency, improving productivity while the manufacturing complexity increase is offset by the use of standard cooling channel fabrication techniques.
3Temperature
If coolant channels are integrated within the faceplate, then the cooling efficiency is improved, but the faceplate structure becomes more complex
Solution Approach 1:
The coolant channels are nested within the faceplate structure, with channels positioned in recesses or cavities of the faceplate body. This nesting approach achieves efficient thermal contact between the coolant and faceplate surface for improved temperature control, while the channels are integrated into the existing faceplate geometry rather than adding separate external components.
Solution Approach 2:
The coolant channels utilize hydraulic flow principles to distribute cooling fluid efficiently across the faceplate. By designing channels that leverage fluid dynamics for uniform heat removal, the system achieves effective temperature control with a relatively simple channel network, minimizing the increase in faceplate structural complexity.
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 cooled showerhead allows for a thicker film buildup before flaking, reducing the frequency of cleaning cycles, increasing substrate processing capacity and extending the showerhead's lifespan by minimizing wear and extending the period between replacements.
Implementation Method 1
coolant channels that: fluidly connect the first outer plenum with the second outer plenum; are located within the faceplate between the first and second surfaces
Data Source
AI summary
A showerhead for a substrate processing chamber includes: inner walls; an inner plenum between the inner walls; and a faceplate having a first surface and a second surface that is opposite the first surface. Holes through the faceplate extend from the first surface to the second surface. A first inlet is fluidly connected to the inner plenum. A first outer plenum is between the inner walls and outer walls. A second outer plenum is between the inner walls and the outer walls. Coolant: fluidly connect the first outer plenum with the second outer plenum; are located within the faceplate between the first and second surfaces; and are fluidly isolated from the holes. The showerhead also includes a second inlet that is fluidly connected to the first outer plenum.