Laser-Textured Gas Diffuser Plate for Uniform Thin Film Deposition
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Solution Overview
Problem
Existing thin film deposition systems, particularly in cyclic deposition chambers, face challenges with non-uniform precursor distribution and temperature fluctuations, leading to reduced productivity and film uniformity.
Innovation Solution
A gas diffuser plate with a laser-textured surface is introduced, featuring microstructures that provide an emissivity between 0.2 and 0.9, and a corrosion-resistant coating to reduce particle contamination and enhance temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional smooth-surface gas diffuser plate is used, then the device structure is simple and manufacturing is easy, but temperature fluctuations occur and film uniformity deteriorates
Solution Approach 1:
The gas diffuser plate applies local quality by creating laser-textured regions with specific microstructures (dimples, grooves, or roughened surfaces) in areas where gas distribution and thermal stability are critical, while maintaining smoother surfaces in other areas. This localized texturing improves precursor distribution and temperature stability without requiring the entire plate to be complex.
Solution Approach 2:
The laser-textured surface introduces dynamic thermal management by creating microstructures that enhance radiative heat transfer and thermal equilibration. The textured regions have increased surface area and emissivity, allowing the diffuser plate to dynamically respond to temperature variations and maintain more stable operating conditions during deposition cycles.
2Reliability
If the gas diffuser plate operates without corrosion-resistant coating, then the manufacturing process is simpler, but particle contamination increases and reliability deteriorates
Solution Approach 1:
The gas diffuser plate employs composite materials by combining the base plate material (e.g., aluminum or stainless steel) with a corrosion-resistant coating layer (e.g., fluoropolymer or ceramic coating). This composite structure provides both the mechanical integrity of the base material and the chemical resistance of the coating, preventing particle generation from corrosion while maintaining manufacturability.
Solution Approach 2:
The corrosion-resistant coating acts as a sacrificial protective layer that can be applied relatively simply and replaced if necessary. While the coating adds a manufacturing step, it prevents far more expensive failures from particle contamination and equipment damage, effectively serving as a cost-effective protection strategy.
3Stability of the object's composition
If laser texturing is applied to the gas diffuser plate, then temperature stability improves and film uniformity increases, but manufacturing complexity and processing time increase
Solution Approach 1:
The laser texturing is applied as a preliminary surface treatment step before the diffuser plate enters service. By pre-texturing the surface with microstructures that enhance thermal stability, the system achieves improved temperature control from the first use, eliminating the need for extended in-situ conditioning time that would otherwise be required to develop thermal stability.
Solution Approach 2:
The laser texturing process replaces extended thermal conditioning cycles with a controlled surface modification process. Instead of relying on prolonged operational conditioning to achieve thermal stability, the laser-induced microstructures immediately provide the desired thermal characteristics, reducing overall system preparation time.
4Manufacturing precision
If the emissivity of the gas diffuser plate is not controlled, then the device design is simpler, but temperature fluctuations increase and deposition uniformity worsens
Solution Approach 1:
The gas diffuser plate controls emissivity by changing the surface parameter through laser texturing, which modifies the surface roughness, area, and material properties in the textured regions. This parameter change increases emissivity in critical areas, enhancing radiative heat transfer and thermal stability without requiring complex active control mechanisms.
Solution Approach 2:
The diffuser plate surface is segmented into different regions with different emissivity characteristics through selective laser texturing. High-emissivity textured regions are placed where thermal control is most needed, while other areas maintain lower emissivity, creating a zoned thermal management system that improves deposition uniformity without requiring the entire plate to be uniformly complex.
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 laser-textured gas diffuser plate improves the uniformity of thin film deposition by stabilizing temperature fluctuations and reducing particle contamination, thereby enhancing productivity and film quality.
Implementation Method 1
the laser-textured surface comprises microstructures to provide an emissivity of the gas diffuser plate between about 0.2 and about 0.9
Implementation Method 2
a gas diffuser plate having a laser-textured surface configured to face a substrate when present in the cyclic deposition chamber
Data Source
AI summary
A gas diffuser plate configured to diffuse gases delivered into a cyclic deposition chamber is disclosed. The gas diffuser plate as fabricated comprising a gas diffuser plate having a laser-textured surface configured to face a substrate when present in the cyclic deposition chamber. The laser-textured surface comprises microstructures that serve to provide an emissivity of the gas diffuser plate between about 0.2 and about 0.9. The gas diffuser plate further comprises a corrosion-resistant material coating the laser-textured surface. The emissivity of the gas diffuser plate is at least partially based on the parameters of the processing laser.