Hydrophobic Coating on CMP Clamp Ring
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Solution Overview
Problem
Chemical mechanical polishing (CMP) processes face challenges with slurry particles adhering to and agglomerating on carrier head components, leading to substrate defects due to particle dislodgement and scratching during polishing.
Innovation Solution
An external clamp ring for CMP carrier heads is designed with a hydrophobic coating on its outer and inner cylindrical walls to prevent slurry particle adherence and agglomeration, utilizing materials like stainless steel and featuring a flexible membrane retention mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the carrier head surfaces are made smooth and accessible for rinsing, then slurry particle adhesion is reduced, but structural complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies a disposable or replaceable coating layer on the clamp ring surface that prevents slurry adhesion. This coating can be applied economically and replaced when worn, avoiding the need for complex permanent structural modifications to the carrier head.
Solution Approach 2:
The patent uses composite material structure by combining the base clamp ring material with a specialized coating layer that has anti-adhesion properties. This allows the clamp ring to maintain its structural function while the coating provides the anti-fouling surface.
2Manufacturing precision
If hydrophobic coating is applied to prevent slurry adhesion, then substrate defect rate decreases, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the surface energy parameters of the clamp ring by applying a hydrophobic coating. This modifies the wettability and adhesion characteristics of the surface, preventing slurry particles from adhering. The coating can be applied using standard industrial techniques.
Solution Approach 2:
The hydrophobic coating is applied as a relatively simple, cost-effective layer that can be reapplied or replaced without replacing the entire clamp ring, making the manufacturing process more economical.
3Ease of manufacture
If the clamp ring is made with simple cylindrical geometry, then manufacturing is easier, but slurry particle agglomeration increases on the surface
Solution Approach 1:
Instead of modifying the basic cylindrical geometry of the clamp ring, the patent applies a disposable or replaceable coating that prevents agglomeration. This maintains the simple, easy-to-manufacture geometry while adding the anti-adhesion functionality through the coating layer.
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 hydrophobic coating significantly reduces slurry particle adhesion and agglomeration on the clamp ring, minimizing substrate defects by preventing particles from falling onto the polishing pad and causing scratches.
Implementation Method 1
The clamp ring includes an outer cylindrical wall configured to prevent adherence and agglomeration of slurry particles to the clamp ring
Data Source
Figure 1
Figure 2~3
AI summary
An external clamp ring for a chemical mechanical polishing (CMP) carrier head having a hydrophobic coating, and a carrier head having the same are described herein. In one embodiment, an external clamp ring is provided that includes a cylindrical body having an outer cylindrical wall and an inner cylindrical wall. A hydrophobic layer disposed is on the outer cylindrical wall.