CMP Pad Texture with Embedded Polymer Particles for Stable Polishing
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Solution Overview
Problem
Existing CMP pads suffer from non-uniform polishing properties over their lifetime, leading to variable and difficult-to-control material removal rates, which affects the reliability and consistency of chemical mechanical planarization processes.
Innovation Solution
A CMP pad with polymer particles embedded in the top polishing layer, which maintains a consistent surface texture and increases polishing surface area through exposed polymer particles and pores, improving CMP performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional CMP pad with uniform polishing surface is used, then the pad structure is simple and easy to manufacture, but the polishing properties become non-uniform over time, leading to variable material removal rates
Solution Approach 1:
The polishing pad incorporates polymer particles distributed throughout the polishing layer, creating local variations in surface topology. These particles protrude from the surface and create localized polishing zones with different characteristics, ensuring consistent polishing performance across the entire pad surface and throughout its service life.
Solution Approach 2:
The polishing pad is constructed as a composite material system combining a polymeric base material with dispersed polymer particles. This composite structure integrates particles with different mechanical properties into the matrix, creating a multi-phase material that maintains uniform polishing characteristics while resisting degradation over time.
2Productivity
If the CMP pad surface becomes smooth during use, then the polishing rate decreases, but frequent conditioning is required which reduces productivity
Solution Approach 1:
The polymer particles embedded in the polishing layer automatically protrude as the pad surface wears during use, continuously self-renewing the polishing surface topology. This self-service mechanism maintains optimal surface roughness and polishing rate throughout the pad's service life without requiring external conditioning interventions, thereby maximizing productivity and minimizing downtime.
3Productivity
If the CMP pad material is soft, then the pad is easier to condition and conform to wafer surface, but the material removal rate is reduced
Solution Approach 1:
The polishing pad utilizes polymer particles with controlled size distribution (0.1-10 micrometers) and varying hardness parameters embedded in the polymeric matrix. By adjusting particle size, concentration, and material composition, the pad achieves optimal balance between hardness for material removal and softness for surface conformance, transforming the单一的 hardness parameter into a multi-parameter system.
Data Source
AI summary
A chemical mechanical polishing pad comprising a polishing portion, the polishing portion comprising: a polymeric body; a plurality of polymer particles embedded within the body of the polymeric body, wherein at least a portion of the plurality of polymer particles is at least partially exposed at a surface of the polymeric body; and a plurality of pores at the surface of the polymeric body.