CMP Manifold Anti-Adsorption Coating to Prevent Wafer Scratches
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Solution Overview
Problem
Chemical mechanical polishing processes in semiconductor manufacturing cause scratches on substrates, leading to defects such as wiring bridge and residue sticking, which deteriorate the reliability and electrical characteristics of semiconductor devices.
Innovation Solution
Incorporation of an anti-adsorption layer made of hydrophobic materials on the manifold and arm surfaces of the chemical mechanical polishing apparatus to prevent chemical mechanical polishing slurry and contaminants from being adsorbed, combined with a polishing liquid supply and temperature control system to manage slurry distribution and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical mechanical polishing is performed without anti-adsorption treatment, then polishing process can be conducted, but slurry and contaminants are adsorbed on manifold causing scratches on substrate
Solution Approach 1:
An anti-adsorption layer is formed on the manifold surface before the polishing process begins. This layer pre-prevents the adsorption of slurry and contaminants by creating a hydrophobic barrier, thereby eliminating the harmful effect of slurry adhesion and subsequent substrate scratches during the polishing operation.
Solution Approach 2:
The anti-adsorption layer acts as an intermediary substance between the slurry and the manifold surface. It provides a hydrophobic interface that prevents direct contact and adhesion between the polar slurry components and the manifold, thereby preventing contamination without affecting the polishing function.
2Reliability
If anti-adsorption layer is added to prevent slurry adsorption, then substrate reliability is improved, but device complexity increases
Solution Approach 1:
A thin anti-adsorption film is applied to the manifold surface. This film provides the necessary hydrophobic properties to prevent slurry adsorption while maintaining a simple and compact apparatus structure. The thin film approach avoids complex mechanical modifications to the polishing device.
Solution Approach 2:
The anti-adsorption layer can be implemented as a disposable or easily replaceable coating on the manifold. This approach simplifies the overall device design by using a low-cost, non-structural component that can be renewed rather than designing complex anti-adhesion mechanisms into the permanent apparatus structure.
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
Prevents scratches on substrates during polishing, enhancing the reliability and electrical properties of semiconductor devices by minimizing slurry adhesion and solidification on apparatus components.
Implementation Method 1
an anti-adsorption layer configured to prevent a chemical mechanical polishing slurry or other contaminants existing on the platen from being adsorbed on the manifold
Data Source
AI summary
A chemical mechanical polishing apparatus includes: a polishing pad on a platen; an arm extending from an edge of the polishing pad to a center of the polishing pad or at least near the center of the polishing pad; a base configured to support the arm so that the arm is spaced apart from the polishing pad; a manifold on a lower surface of the arm; and an anti-adsorption layer configured to at least partially cover a lower surface of the manifold, wherein the anti-adsorption layer is configured to prevent a chemical mechanical polishing slurry or other contaminants existing on the platen from being adsorbed on the manifold.