Microcapsule Polishing Pad for UV Self-Healing CMP Surfaces
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Solution Overview
Problem
Chemical Mechanical Polishing (CMP) processes face efficiency reduction due to glazing, where pores in the polishing pad become clogged, leading to a decrease in material removal rate and overall efficiency.
Innovation Solution
A self-healing polishing pad with embedded microcapsules containing a polymer material and a photoinitiator, which breaks during the dressing process, allowing the polymer to be released and polymerized by UV light to heal and maintain the pad's surface, thereby extending its lifespan and maintaining high removal rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a standard polishing pad is used, then the initial polishing efficiency is high, but the pad quickly glazes and pores become clogged, leading to reduced material removal rate
Solution Approach 1:
Microcapsules containing polymer material are pre-embedded throughout the polishing pad structure. During the dressing process, these microcapsules break and release the polymer material onto the pad surface before polishing begins, enabling the pad to self-heal and maintain pore openness throughout its service life, thus sustaining high material removal rates over extended periods
Solution Approach 2:
The polishing pad contains embedded microcapsules that automatically break during dressing and release polymer material that flows into and opens clogged pores. This self-healing mechanism occurs without external intervention, allowing the pad to maintain its own performance and extend its operational life while sustaining high productivity
2Duration of action of stationary object
If the polishing pad operates for extended periods, then productivity is maintained, but glazing occurs and pores become clogged, reducing efficiency
Solution Approach 1:
The embedded microcapsules are designed to break at regular intervals during the dressing process, periodically releasing polymer material that flows into pores to prevent or reverse glazing. This periodic self-healing action maintains pore openness and material removal rate throughout the pad's extended operational life
Solution Approach 2:
The pad automatically performs maintenance through embedded microcapsules that break during dressing and release polymer material to heal the surface and open pores. This self-service mechanism ensures continuous high productivity over extended operational periods without external intervention
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 self-healing polishing pad significantly increases its lifetime and maintains stable, high removal rates, capable of polishing more wafers with consistent efficiency compared to standard pads, with a normalized removal rating within +/-0.05.
Implementation Method 1
microcapsules containing a polymer material and a photoinitiator, which breaks during the dressing process, allowing the polymer to be released and polymerized by UV light
Data Source
AI summary
Provided herein are polishing pads in which microcapsules that include a polymer material and are dispersed, as well as methods of making and using the same. Such microcapsules are configured to break open (e.g., when the polishing pad is damaged during the dressing process), which releases the polymer material. When contacted with ultraviolet light the polymer material at least partially cures, healing the damage to the polishing pad. Such polishing pads have a longer lifetime and a more stable remove rate when compared to standard polishing pads.