Microcapsule Polishing Pad Healing Glazing During CMP Dressing
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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, where the microcapsules are designed to break during the dressing process, releasing the polymer material that is then cured with UV light to restore the pad's surface, maintaining its effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the polishing pad is used continuously for CMP processes, then the polishing efficiency decreases due to glazing and pore clogging, but replacing the pad increases operational time loss and cost
Solution Approach 1:
The polishing pad incorporates microcapsules containing polymer material that automatically rupture during the dressing process, releasing the polymer to fill and heal glazed areas on the pad surface. This self-healing mechanism restores porosity and polishing efficiency without requiring manual intervention or pad replacement, allowing the pad to maintain high material removal rates throughout its extended service life.
2Productivity
If the polishing pad surface becomes glazed and pores clog during use, then polishing efficiency drops, but traditional dressing processes only temporarily restore surface texture without addressing underlying degradation
Solution Approach 1:
The invention changes the physical and chemical parameters of the polishing pad surface by incorporating microcapsules filled with polymer material. During dressing, the mechanical action ruptures these microcapsules, causing the polymer to flow out and fill glazed pores, thereby restoring the pad's porosity and surface properties. This dynamic parameter change enables the pad to recover its original polishing efficiency and maintain stable performance over extended periods.
3Reliability
If standard polishing pads are replaced frequently to maintain efficiency, then consistent performance is achieved, but operational costs and downtime increase
Solution Approach 1:
The polishing pad is pre-loaded with microcapsules containing polymer material during manufacturing. These microcapsules are strategically distributed throughout the pad structure to provide proactive healing capability. When the pad undergoes dressing, the pre-positioned microcapsules rupture and release polymer material that immediately begins filling glazed areas, preventing performance degradation before it occurs and eliminating the need for frequent pad replacements.
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 extends its lifetime, maintains high removal rates, and provides stable polishing efficiency, capable of polishing more wafers with consistent performance compared to standard pads.
Implementation Method 1
the microcapsules are designed to break during the dressing process, releasing the polymer material that is then cured with UV light to restore the pad's surface
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.