Interpenetrating Network CMP Pad for Slurry Flow and Planarization
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Solution Overview
Problem
Conventional chemical mechanical polishing (CMP) pads have suboptimal contact area with substrates and inefficient slurry flow, leading to defects and reduced planarization efficiency, and require frequent conditioning due to irregular surface texture and debris accumulation.
Innovation Solution
A CMP pad with an interpenetrating network of a continuous non-fugitive phase and a co-continuous fugitive phase, featuring a reticulated structure that maintains a consistent polishing surface and reduces the need for conditioning by distributing shear and heat, enhancing both contact area and slurry flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional polishing pads are used, then polishing can be performed, but the real contact area with substrate is insufficient leading to reduced polishing efficiency
Solution Approach 1:
The polishing pad is divided into discrete polishing elements arranged in an array, creating a segmented structure that increases the real contact area with the substrate. Each polishing element acts as an independent contact point, collectively providing enhanced surface coverage and polishing efficiency.
Solution Approach 2:
The polishing pad employs a porous foam substrate that allows slurry penetration and distribution. The porous structure increases the effective contact area by providing multiple pathways for slurry flow and enhancing the interaction between polishing elements and substrate surface.
2Productivity
If conventional polishing pad structures are used, then polishing can proceed, but slurry flow is inefficient leading to debris accumulation and defects
Solution Approach 1:
The polishing pad incorporates hydrodynamic channels that utilize fluid flow mechanics to efficiently transport slurry across the polishing surface. The channel geometry is designed to optimize slurry distribution and facilitate debris removal, preventing accumulation and maintaining polishing quality.
Solution Approach 2:
The porous foam structure provides interconnected voids that facilitate slurry penetration and debris evacuation. The porous network allows efficient fluid dynamics, enabling continuous removal of polishing debris and preventing defect formation.
3Productivity
If polishing continues, then planarization is achieved, but the polishing surface becomes glazed and requires conditioning
Solution Approach 1:
The polishing pad structure is designed to self-maintain its polishing surface characteristics through the reticulated foam architecture. The open-cell structure prevents glazing by allowing continuous slurry access and debris removal, reducing the frequency and intensity of conditioning operations required.
Solution Approach 2:
The polishing pad combines a porous foam substrate with an array of polishing elements to create a composite structure that maintains surface texture consistency. The composite design provides both mechanical stability and surface renewal capabilities, reducing glazing effects.
4Productivity
If polishing elements are added to increase contact area, then polishing efficiency improves, but device complexity increases
Solution Approach 1:
The polishing pad merges the substrate structure with the polishing element array into an integrated composite. The polishing elements are embedded within or attached to the foam substrate, combining structural support and polishing function into a single unified component, thereby managing complexity.
Solution Approach 2:
The foam substrate serves multiple functions: providing mechanical support, facilitating slurry distribution through its porous structure, and anchoring the polishing elements. This multi-functionality reduces the need for separate components, managing overall device complexity while enhancing polishing efficiency.
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 solution achieves higher real contact area and improved slurry flow, reducing defects and extending pad life while maintaining planarization efficiency and uniformity.
Implementation Method 1
distributing shear and heat, enhancing both contact area and slurry flow efficiency
Implementation Method 2
a continuous non-fugitive phase and a substantially co-continuous fugitive phase
Data Source
AI summary
Chemical mechanical polishing pads are provided, wherein the chemical mechanical polishing pads have a polishing layer comprising an interpenetrating network including a continuous non-fugitive phase and a substantially co-continuous fugitive phase. Also provided are methods of making the chemical mechanical polishing pads and for using them to polish substrates.