Multi-disk CMP Pad Conditioner with Gimbal Mounts
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Solution Overview
Problem
Chemical mechanical polishing (CMP) pads become less effective over time due to glazing from slurry by-products and material accumulation, requiring frequent conditioning that disrupts substrate processing and reduces throughput.
Innovation Solution
A multi-disk pad conditioner system with independently mounted conditioning elements and a gimbal connection allows for efficient retexturing and abrasive removal from the polishing pad, utilizing multiple conditioning surfaces to concurrently contact the pad and reduce conditioning time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single conditioning element is used to condition the polishing pad, then the device complexity is low, but the conditioning time is excessive and substrate throughput decreases
Solution Approach 1:
The conditioner is divided into multiple independent conditioning elements (first conditioning element, second conditioning element, etc.) that can simultaneously contact different regions of the polishing pad. This segmentation allows parallel conditioning operations, reducing total conditioning time and improving substrate throughput without requiring a single complex mechanism
2Reliability
If multiple conditioning elements are mounted on a rigid structure, then the conditioning effectiveness increases, but the ability to conform to pad surface variations decreases
Solution Approach 1:
Each conditioning element is mounted on an independent compliant mechanism that can dynamically adjust its position and contact pressure. The conditional elements can independently conform to pad surface variations while maintaining reliable contact, ensuring consistent conditioning effectiveness across the entire pad surface
3Manufacturing precision
If conditioning is performed frequently to maintain pad effectiveness, then the polishing quality is maintained, but the substrate processing time is reduced
Solution Approach 1:
The multi-element conditioner can rapidly condition the entire polishing pad surface in a single operation by having multiple elements work simultaneously across different regions. This continuous coverage reduces the frequency and duration of conditioning interruptions, maintaining polishing quality while minimizing loss of substrate processing time
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 system significantly reduces conditioning process time, improves substrate throughput, and extends the life of conditioning elements by providing more efficient and aggressive conditioning compared to conventional methods.
Implementation Method 1
A pad conditioner may include an abrasive head that can be rubbed against a surface of the polishing pad to remove unwanted accumulations and to retexture the pad
Implementation Method 2
a first pad conditioner assembly and a second pad conditioner assembly each compliantly attached to the main assembly
Data Source
AI summary
A pad conditioner may include multiple independently mounted conditioning elements configured to condition a polishing pad used in, e.g., a chemical mechanical polishing (CMP) process. In some embodiments, the pad conditioner may include a main assembly disk and a main assembly base plate attached to the main assembly disk via a gimbal connection. A plurality of pad conditioner assemblies may be attached to the main assembly base plate. In some embodiments, each pad conditioner assembly may include a pad conditioner disk attached to the main assembly base plate, a pad conditioner base attached to the pad conditioner disk via a gimbal connection, and a conditioning element attached to the pad conditioner base. Methods of conditioning a polishing pad are also provided, as are other aspects.