CMP Contact Cleaning Units to Cut Transfer and Air Exposure
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Solution Overview
Problem
Transfer and air time in chemical mechanical polishing (CMP) systems contribute to substrate contamination, defects, uneven material removal, and subsurface damage, compromising substrate quality and uniformity.
Innovation Solution
Incorporation of contact cleaning units within the polishing module to reduce transfer and air time, utilizing non-contact cleaning units before polishing and contact cleaning units between polishing stations to minimize contamination and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If substrate transfer time and air exposure time are reduced, then substrate contamination and defects are minimized, but the system complexity increases due to integration of contact cleaning units within the polishing module
Solution Approach 1:
The contact cleaning unit is integrated within the polishing module, merging the cleaning function with the polishing process. This allows substrate cleaning to occur during the polishing operation without requiring separate transfer steps, thereby reducing air exposure time and contamination while avoiding additional system complexity from separate cleaning modules
Solution Approach 2:
The cleaning unit operates continuously during the polishing process, eliminating idle transfer time where the substrate would be exposed to air. The substrate remains in contact with the polishing pad or cleaning surface without interruption, maintaining a continuous protective environment that prevents contamination
2Loss of time
If contact cleaning units are integrated within the polishing module, then transfer time is reduced, but the device complexity increases
Solution Approach 1:
The contact cleaning unit is merged with the polishing module structure, allowing cleaning operations to occur during the polishing cycle without requiring separate transfer mechanisms or additional module interfaces, thus reducing transfer time while limiting complexity increase
Solution Approach 2:
The polishing module is designed to perform both polishing and cleaning functions using shared mechanical structures and control systems. The same substrate handling mechanism serves both operations, eliminating the need for dedicated transfer equipment and reducing overall device complexity despite the added cleaning capability
3Reliability
If air exposure time is minimized, then substrate oxidation and subsurface damage are reduced, but the manufacturing precision requirements increase for precise substrate positioning during contact cleaning
Solution Approach 1:
The substrate is pre-positioned and secured on the polishing pad before the cleaning operation begins. This preliminary positioning ensures that when contact cleaning occurs, the substrate is already in the correct location, reducing the precision requirements during the actual cleaning process while minimizing air exposure time
Data Source
AI summary
Embodiments of the disclosure provided herein include systems and methods for reducing substrate transfer and air time in chemical mechanical polishing systems. The system includes one or more polishing stations disposed within a polishing module, a contact cleaning unit disposed adjacent to the one or more polishing stations, and a controller. The controller is configured to transfer the substrate to a first polishing station of the one or more polishing stations, transfer the substrate to the contact cleaning unit from the first polishing station, and clean the substrate using a contact cleaning method. A method includes placing a substrate on a first non-contact cleaning unit cleaning the substrate using a first non-contact cleaning method, transferring the substrate to a first polishing station, transferring the substrate to a contact cleaning unit from the first polishing station, and cleaning the substrate using a contact cleaning method.