Non-Planar CVD Diamond CMP Pad Conditioner
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Solution Overview
Problem
Conventional CMP pad conditioners face challenges such as high wear rates, inefficient material removal, and damage to polishing pads due to large diamond grit and uneven surfaces, which affect the quality and longevity of polishing operations, especially when processing metal surfaces.
Innovation Solution
A composite ceramic substrate with a CVD diamond coating, featuring non-planar surface features and a carbide-forming material for enhanced adhesion and durability, which reduces the need for additional diamond grit and minimizes surface damage during conditioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional diamond grit is used in CMP pad conditioners, then material removal rate is improved, but pad wear rate increases and pad life decreases
Solution Approach 1:
The invention changes the physical and chemical parameters of the conditioner surface by using CVD diamond coating with controlled roughness (0.03-0.5 micrometer Ra) instead of conventional diamond grit. This parameter change allows efficient material removal while reducing mechanical damage to the pad, thereby extending pad life.
Solution Approach 2:
The invention uses a composite structure combining CVD diamond coating on a substrate, creating a material with superior properties. The CVD diamond layer provides hardness and controlled roughness for effective conditioning, while the substrate provides structural support, resulting in both high productivity and extended pad life.
2Reliability
If large diamond grit particles are used in conditioners, then conditioning effectiveness is improved, but surface damage to the pad increases
Solution Approach 1:
The invention changes the surface roughness parameter to a controlled range (0.03-0.5 micrometer Ra) using CVD diamond coating, which is significantly smoother than conventional diamond grit surfaces. This parameter change maintains conditioning effectiveness while eliminating the harmful surface damage caused by large grit particles.
Solution Approach 2:
The invention replaces the durable but damaging diamond grit with a thinner CVD diamond coating that can be refreshed or replaced more easily, reducing the harm to pads while maintaining conditioning effectiveness through controlled surface properties.
3Ease of manufacture
If conventional nickel-plated conditioners are used, then manufacturing ease is improved, but chemical compatibility with metal slurries deteriorates
Solution Approach 1:
The invention uses a composite structure of CVD diamond coating on a substrate, which provides both chemical inertness to metal slurries and the necessary mechanical properties. This composite material is universally compatible with all slurry types, eliminating the chemical compatibility limitations of nickel-plated conditioners.
Solution Approach 2:
The invention replaces the chemically reactive nickel-plated conditioners with CVD diamond-coated conditioners that have superior chemical stability. The CVD diamond layer provides a chemically inert surface that does not react with metal slurries, expanding adaptability to all CMP applications.
4Strength
If silicon substrate is used for CVD diamond coating, then adhesion is improved, but dimensional stability deteriorates due to bowing
Solution Approach 1:
The invention uses a composite substrate structure (such as metal-ceramic or multi-layer construction) that combines materials with complementary properties. The substrate provides dimensional stability and flatness, while the CVD diamond coating provides adhesion and conditioning functionality, resolving the contradiction between adhesion and dimensional stability.
Solution Approach 2:
The invention changes the substrate material parameters from pure silicon to composite structures with controlled thermal expansion and mechanical properties. This parameter change reduces thermal stress and bowing during CVD processing, maintaining dimensional stability while preserving diamond adhesion through proper surface preparation.
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 extends the life of polishing pads, maintains high wafer removal rates, and provides uniform material removal across the wafer surface, effectively conditioning both metal and oxide surfaces without causing damage, thus improving the overall efficiency and quality of CMP processes.
Implementation Method 1
A chemical vapor deposited diamond coating is disposed on at least a portion of a surface of the substrate
Implementation Method 2
a second phase comprising at least one material having a higher adhesion to chemical vapor deposited diamond than the ceramic material
Data Source
AI summary
The present invention relates to a composite material having non-planar geometries and edge-shaving surfaces comprising a CVD diamond coating applied to a composite substrate made from a ceramic material and a preferably unreacted carbide-forming material of various configurations and for a variety of applications.