CMP Pad Conditioner with Radial Apertures for Uniform Solution Distribution
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Solution Overview
Problem
Conventional conditioning systems for polishing pads in CMP processes fail to uniformly distribute the conditioning solution, leading to incomplete removal of waste material and non-uniform surface texture, resulting in uneven planarization and potential glazing issues.
Innovation Solution
The proposed solution involves a conditioner with a member having a plurality of apertures or spray nozzles arranged in a uniform pattern to ensure even distribution of the conditioning solution across the polishing pad, combined with a movable end effector and arm system to rub the pad, ensuring uniform contact and effective waste removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional conditioner with a single conditioning solution delivery point is used, then the structure is simple, but the conditioning solution is not uniformly distributed across the polishing pad
Solution Approach 1:
The conditioner's conditioning solution delivery system is segmented into multiple delivery points arranged in a radial pattern across the polishing pad surface. This segmentation allows the conditioning solution to be distributed uniformly across different regions of the pad, resolving the non-uniform distribution problem while maintaining reasonable structural complexity
Solution Approach 2:
Different regions of the polishing pad are provided with conditioning solution through locally positioned delivery points. The radial arrangement ensures that each region receives appropriate conditioning solution flow, creating local quality improvements that collectively achieve uniform overall distribution
2Reliability
If the conditioning solution is delivered at a fixed location, then the delivery system is simple, but waste material is not completely removed from the pad
Solution Approach 1:
The single fixed conditioning solution delivery point is segmented into multiple radial delivery points. This allows waste material removal to occur across multiple locations simultaneously, ensuring complete waste material removal from the entire polishing pad surface while keeping the overall system relatively simple
Solution Approach 2:
The conditioning solution delivery transitions from a single-point (0D) or line (1D) approach to a radial two-dimensional arrangement. This dimensional change enables comprehensive coverage of the polishing pad surface, ensuring complete waste material removal across all regions
3Manufacturing precision
If a conventional conditioner is used, then the device is simple to operate, but the planarizing surface becomes glazed with accumulations of waste material
Solution Approach 1:
The conditioning function is segmented into multiple radial delivery points that work simultaneously to prevent waste material accumulation and glazing across the entire polishing pad. This segmentation maintains uniform planarization while requiring minimal operational complexity, as the system operates automatically during polishing
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 ensures a uniform distribution of the conditioning solution across the polishing pad, maintaining consistent planarization and preventing glazing, thereby improving the CMP process's accuracy and efficiency by effectively removing waste material from the pad.
Implementation Method 1
Conditioning involves delivering a conditioning solution to chemically remove waste material from the planarizing pad
Implementation Method 2
moving a conditioner across the pad. The conventional conditioner includes an abrasive end effector generally embedded with diamond particles
Implementation Method 3
The typical end effector removes a thin layer of the planarizing pad material in addition to the waste matter to form a more planar, clean planarizing surface
Data Source
AI summary
Apparatuses and methods for conditioning polishing pads used in polishing micro-device workpieces are disclosed herein. In one embodiment, an end effector for conditioning a polishing pad includes a member having a first surface and a plurality of contact elements projecting from the first surface. The member also includes a plurality of apertures configured to flow conditioning solution to the polishing pad. The apertures can extend from the first surface to a second surface opposite the first surface. The member can further include a manifold that is in fluid communication with the apertures. In another embodiment, a conditioner for conditioning the polishing pad includes an arm having at least one spray nozzle configured to spray conditioning solution onto the polishing pad and an end effector coupled to the arm. The end effector includes a first surface and a plurality of contact elements projecting from the first surface.