Steam Preheating of CMP Components for Uniform Polishing
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Solution Overview
Problem
Chemical mechanical polishing (CMP) processes face challenges with temperature variations in the polishing pad, leading to non-uniformity and defects due to heat sinks and polishing by-products, which affect polishing performance and substrate integrity.
Innovation Solution
The use of steam, generated by boiling, for cleaning and pre-heating components in the CMP system, including carrier heads and conditioner disks, to control temperature and remove polishing by-products effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cleaning methods are used for CMP components, then cleaning process is simple, but cleaning efficiency is low and residue accumulates
Solution Approach 1:
The patent applies phase transition by using steam (gaseous water) to clean CMP components. The steam condenses upon contact with cooler surfaces, providing effective cleaning through the phase change from gas to liquid, which removes residue and debris more efficiently than conventional liquid cleaning methods.
Solution Approach 2:
The patent changes the temperature parameter of the cleaning medium by using heated steam instead of ambient temperature liquid. This temperature parameter change enhances the cleaning effectiveness by dissolving and removing organic and inorganic residues that would not be effectively removed by cooler liquids.
2Manufacturing precision
If components are preheated before polishing, then temperature control improves, but energy consumption increases
Solution Approach 1:
The patent utilizes the latent heat of condensation during steam phase transition to transfer thermal energy efficiently to CMP components. When steam condenses on component surfaces, it releases substantial heat energy, achieving effective preheating with lower overall energy input compared to direct heating methods.
Solution Approach 2:
The steam cleaning and preheating process is integrated into the existing CMP workflow, where the same steam generation system serves dual purposes of cleaning and temperature control. This self-service approach reduces the need for separate heating systems and optimizes energy utilization.
3Reliability
If steam is used for cleaning, then residue removal improves, but system complexity increases
Solution Approach 1:
The patent implements a multi-functional steam generation system that performs both cleaning and preheating operations. The same steam delivery infrastructure serves dual purposes: removing residues through condensation and preparing components for polishing through controlled heating, thereby reducing the need for separate cleaning and heating systems.
Solution Approach 2:
The patent introduces steam as an intermediary medium that bridges the gap between cleaning and temperature control functions. The steam acts as a carrier that simultaneously achieves residue removal through condensation and component preheating through heat transfer, simplifying the overall system architecture.
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 reduces temperature variations, improves polishing uniformity, and minimizes defects by efficiently cleaning and pre-heating components, enhancing the predictability and consistency of the CMP process.
Implementation Method 1
directing a gas that includes steam from an orifice onto a component in the polishing system while the component is spaced away from a polishing pad of the polishing system to raise a temperature of the component to an elevated temperature
Implementation Method 2
a boiler, a treatment station spaced from the polishing pad and having a plurality of nozzles to direct steam from the boiler onto a body positioned in the treatment station
Data Source
AI summary
A method of temperature control for a chemical mechanical polishing system includes directing a gas that includes steam from an orifice onto the component in the polishing system while the component is spaced away from a polishing pad of the polishing system to raise a temperature of the component to an elevated temperature, and before the component returns to an ambient temperature, moving the component into contact with the polishing pad.