3D Printed CMP Pad Thickness Uniformity via Layered Deposition
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Solution Overview
Problem
Conventional polishing pads exhibit non-uniform thickness, leading to variations in pressure and defects such as micro-scratches during chemical mechanical polishing, particularly at low pressures, due to their manufacturing methods which struggle to maintain uniformity and precision.
Innovation Solution
The use of 3D printing to fabricate polishing pads by successively depositing and solidifying thin layers of pad material, allowing for precise control of thickness and formation of recesses and grooves, resulting in improved thickness uniformity and adaptability in pad configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional molding or casting methods are used to manufacture polishing pads, then manufacturing simplicity is maintained, but thickness uniformity deteriorates leading to non-uniform pressure and defects
Solution Approach 1:
The polishing pad is manufactured as a single integrated piece using 3D printing, eliminating the need for separate molding or casting operations. The layer-by-layer deposition process inherently segments the manufacturing into controlled incremental steps, achieving uniform thickness without complex post-processing
Solution Approach 2:
Traditional mechanical molding or casting processes are replaced with a 3D printing system that uses controlled material deposition and solidification. This substitution of manufacturing methodology enables precise thickness control through digital modeling while simplifying the overall manufacturing process
2Manufacturing precision
If standard molding processes are used, then production speed is maintained, but thickness variation increases causing non-uniform polishing performance
Solution Approach 1:
The 3D printing process continuously deposits and solidifies material layers without interruption, maintaining consistent thickness throughout the polishing pad. This continuous fabrication process eliminates the thickness variations inherent in traditional molding while keeping production efficient through automated layer-by-layer construction
3Adaptability or versatility
If grooves are machined into polished pads after manufacturing, then pad functionality is improved, but thickness uniformity deteriorates due to machining variations
Solution Approach 1:
The grooves and surface features are designed into the polishing pad during the 3D printing process itself, rather than being added afterward. This preliminary formation of functional features through controlled material deposition ensures uniform thickness is maintained while achieving the desired pad functionality
Solution Approach 2:
The manufacturing process and feature formation are merged into a single 3D printing operation. The grooves, channels, and surface patterns are all created simultaneously with the pad structure through programmed material deposition, eliminating separate machining steps that would compromise thickness uniformity
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
This approach enables the production of polishing pads with tight thickness tolerances, improved uniformity across the substrate, reduced defects, and cost-effective manufacturing, particularly effective at low pressures, while allowing for faster and more versatile pad configurations.
Implementation Method 1
In a 3D printing process a thin layer of pad precursor, e.g., a powder, is progressively deposited and fused to form a full 3-dimensional polishing pad
Implementation Method 2
each layer of the plurality of polishing layers deposited by ejecting a pad material precursor from a nozzle and solidifying the pad material precursor to form a solidified pad material
Data Source
AI summary
A method of fabricating a polishing layer of a polishing pad includes successively depositing a plurality of layers with a 3D printer, each layer of the plurality of polishing layers deposited by ejecting a pad material precursor from a nozzle and solidifying the pad material precursor to form a solidified pad material.