In-Chamber Showerhead Cleaning Assembly for High-Temperature Deposits
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Solution Overview
Problem
Current methods for cleaning showerheads in plasma chambers are inefficient, requiring downtime, exposing technicians to harmful contaminants, and not effectively removing deposits at high temperatures, leading to reduced processing efficiency and potential substrate contamination.
Innovation Solution
A self-maintenance system using an adhesive-less polymeric pad with bio-mimicry micro-structures and a vertical movement mechanism to clean the showerhead within the plasma chamber at elevated temperatures without opening it, reducing downtime and ensuring safety by containing contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual wiping with polyester or cotton pads is used to clean the showerhead, then the showerhead can be cleaned, but the plasma chamber must be opened and cooled down, causing 48 hours of downtime
Solution Approach 1:
The showerhead is equipped with a self-cleaning mechanism that automatically removes contaminants during or after the plasma processing cycle, eliminating the need for manual intervention and chamber opening. The system uses the plasma environment itself to facilitate cleaning, allowing continuous operation without 48-hour downtime.
Solution Approach 2:
The manual mechanical wiping process is replaced with an automated cleaning mechanism that uses plasma-generated forces or automated actuators to remove contaminants. This substitution eliminates the need for chamber opening and cooling periods, maintaining continuous operation.
2Ease of manufacture
If polyester cloth pad is used to clean the showerhead, then cleaning can be performed, but it cannot be used at high temperatures above 295°C, limiting cleaning timing options
Solution Approach 1:
The cleaning mechanism uses materials and methods that can operate at the showerhead's actual operating temperatures (above 295°C). The system changes the temperature parameter compatibility by using temperature-resistant materials or by performing cleaning at high temperature rather than requiring cooling first.
3Ease of operation
If manual cleaning is performed, then technicians can remove contaminants, but they are exposed to toxic powders that are harmful if inhaled
Solution Approach 1:
The showerhead performs self-cleaning automatically without technician intervention, eliminating exposure risks. The contaminants are removed by the automated system while contained within the chamber, and technicians are not required to open the chamber or handle contaminated components.
Solution Approach 2:
An automated cleaning mechanism acts as an intermediary between the contaminants and technicians, performing the cleaning function while keeping technicians isolated from harmful exposures. The system mediates the cleaning process through robotic or plasma-based mechanisms that contain contaminants.
4Productivity
If the showerhead is not cleaned frequently, then downtime is minimized, but unwanted materials build up and negatively affect processing efficiency
Solution Approach 1:
The self-cleaning mechanism operates continuously or at optimized intervals during normal production cycles, maintaining processing efficiency without requiring separate cleaning downtime. The cleaning action is integrated into the operational flow, ensuring continuous useful action rather than interrupting for cleaning.
Solution Approach 2:
The system performs preliminary cleaning actions during or immediately after processing cycles, preventing contaminant buildup before it affects efficiency. By addressing cleaning proactively rather than reactively, the system maintains optimal performance without sacrificing productivity.
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 chamber downtime, ensures proper and frequent cleaning, enhances safety, and extends the life of the showerhead by effectively removing contaminants at high temperatures without exposing the chamber to outside air.
Implementation Method 1
The contaminants adhere to the micro-structures on the polymeric pads by Van der Waals forces and/or electrostatic forces.
Implementation Method 2
The contaminants adhere to the micro-structures on the polymeric pads by Van der Waals forces and/or electrostatic forces.
Implementation Method 3
The cleaning assembly is pressed against the shower head by a vertical movement mechanism in the plasma chamber.
Data Source
AI summary
Systems and methods for cleaning a showerhead are described. One of the systems includes a support section and a press plate located above the support section to be supported by the support section. The system further includes a cleaning layer located above the press plate. The cleaning layer moves to clean a showerhead. The support section contacts an arm of a spindle assembly for movement with movement of the arm.