CMP Steam Treatment Station for Pad Temperature Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Chemical mechanical polishing (CMP) processes face issues with temperature variations in the polishing pad, leading to non-uniformity in substrate polishing, and the accumulation of debris and slurry on components, which can cause defects and hinder temperature uniformity.
Innovation Solution
The use of steam, generated by boiling, for cleaning and preheating components in the CMP system, including carrier heads and conditioner disks, to efficiently remove polishing by-products and maintain temperature consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If steam treatment is applied to clean and preheat carrier heads and substrates, then temperature uniformity and cleaning effectiveness are improved, but system complexity and energy consumption increase
Solution Approach 1:
The steam treatment system is segmented into multiple independently controllable nozzle groups positioned at different locations (first nozzle for outer surface, second nozzle for interior surface, third and fourth nozzles for top and bottom surfaces). This segmentation allows targeted steam application to different carrier head and substrate surfaces, improving temperature uniformity while enabling selective activation of nozzle groups to manage system complexity.
Solution Approach 2:
Steam treatment is applied as a preliminary action before the carrier head enters the polishing chamber and before polishing begins. The system preheats carrier heads and substrates to the desired temperature in advance, ensuring temperature uniformity is achieved before the polishing process starts, thereby eliminating the need for complex real-time temperature control during polishing.
2Manufacturing precision
If steam is used for cleaning and preheating, then polishing defect reduction and cleanliness are improved, but energy consumption and operational complexity increase
Solution Approach 1:
The system changes the physical state parameter of water from liquid to steam phase to achieve both cleaning and preheating functions simultaneously. Steam condensation on carrier heads and substrates provides both cleaning action and heat transfer, improving polishing uniformity while the phase change efficiency reduces overall energy consumption compared to using separate heating and cleaning systems.
Solution Approach 2:
The steam treatment system performs multiple functions simultaneously: cleaning carrier heads and substrates, preheating them to target temperature, and removing moisture. This multi-functionality reduces the need for separate cleaning and heating systems, thereby reducing total energy consumption while maintaining high polishing uniformity.
3Temperature
If multiple nozzles are positioned to treat different surfaces of carrier head and substrate, then temperature uniformity and cleaning coverage are improved, but device complexity increases
Solution Approach 1:
The nozzle system is segmented into four independently positioned nozzles, each targeting a specific surface: first nozzle for outer surface, second nozzle for interior surface, third nozzle for top surface, and fourth nozzle for bottom surface. This segmentation ensures comprehensive temperature uniformity and cleaning coverage across all surfaces while allowing selective operation of individual nozzles based on process requirements, thereby managing device complexity.
Solution Approach 2:
Each nozzle is positioned to deliver steam to a specific local area of the carrier head or substrate surface. The first nozzle targets the outer surface, the second nozzle targets the interior surface, the third nozzle targets the top surface, and the fourth nozzle targets the bottom surface. This local quality approach ensures uniform temperature distribution across different regions while using a modular nozzle configuration that manages overall device complexity.
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
Steam effectively dissolves and removes debris, reduces polishing defects, and maintains temperature uniformity, improving within-wafer and wafer-to-wafer uniformity by controlling temperature variations in the polishing process.
Implementation Method 1
steam, generated by boiling
Implementation Method 2
Steam effectively dissolves and removes debris
Implementation Method 3
maintains temperature uniformity, improving within-wafer and wafer-to-wafer uniformity by controlling temperature variations
Data Source
AI summary
An apparatus for steam treatment of a conditioner head and/or conditioner disk in a chemical mechanical polishing system includes a conditioner cleaning cup, a boiler to generate steam, one or more nozzles positioned to direct steam inwardly into a cavity defined by the load cup, and a supply line running from the boiler to the one or more nozzles to supply steam to the one or more nozzles.