CMP Pad Disulfide Bridges for Thermal Stress Durability
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Solution Overview
Problem
Conventional chemical mechanical polishing (CMP) pads experience breakdown due to thermal and mechanical stress, leading to reduced lifetimes and inconsistent performance during CMP processes.
Innovation Solution
A CMP pad with a disulfide bridge in a polyurethane matrix that undergoes chain exchange reactions at high temperatures, rearranging bonds instead of breaking them, thereby enhancing durability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CMP pad materials are used, then initial polishing performance is achieved, but the pads experience breakdown due to thermal and mechanical stress, resulting in decreased lifetime and inconsistent performance
Solution Approach 1:
The patent changes the chemical composition parameters of the CMP pad material by incorporating disulfide bonds into the polymer matrix. This compositional parameter change enables the material to undergo chain exchange reactions at elevated temperatures, transforming the material's thermal response characteristics from degradation to self-repair, thereby maintaining performance consistency and extending lifetime under thermal and mechanical stress
Solution Approach 2:
The patent creates a composite material system combining polymer chains with disulfide bonds integrated into the matrix structure. This composite approach merges the mechanical properties of the polymer base material with the thermal stability and self-healing capabilities of disulfide bond networks, resulting in a material that simultaneously achieves initial polishing performance and resistance to thermal-mechanical breakdown
2Productivity
If high temperature and high mechanical stress conditions are applied during CMP processes, then material removal is achieved, but conventional CMP pads experience breakdown and performance degradation
Solution Approach 1:
The patent converts the harmful effect of high temperature (which causes conventional pad breakdown) into a beneficial effect by utilizing the temperature-dependent chain exchange reaction of disulfide bonds. The thermal energy that would normally degrade the material instead activates the self-healing mechanism, allowing the pad to maintain structural integrity and performance stability while achieving high material removal rates under demanding CMP conditions
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 CMP pad exhibits improved material removal rates and extended lifespan, maintaining performance under high stress conditions with reduced need for conditioning and increased resilience.
Implementation Method 1
The disulfide bridge may include a disulfide bond capable of undergoing a chain exchange reaction at temperatures experienced during chemical mechanical polishing processes, resulting in rearrangement of nearby disulfide bonds during the chemical mechanical polishing processes rather than breakage of these bonds
Data Source
AI summary
A precursor for preparing a chemical mechanical polishing pad includes a prepolymer, a disulfide-containing component, and a curative. The chemical mechanical polishing pad prepared from the precursor includes a disulfide bridge in a polymer matrix. The disulfide bridge may include a disulfide bond capable of undergoing a chain exchange reaction at temperatures experienced during chemical mechanical polishing processes, resulting in rearrangement of nearby disulfide bonds during the chemical mechanical polishing processes rather than breakage of these bonds.