EUV Pod Cleaning Process with Segmented Chambers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The EUV POD cleaning process faces challenges in efficiently separating and cleaning the inner and outer PODs, particularly due to contamination risks and the complexity of handling delicate EUV masks and pellicles, which are expensive and difficult to store and transport.
Innovation Solution
A POD cleaning process that separates the inner and outer PODs into distinct cleaning and drying chambers, using steam and cleaning solutions, followed by vacuum processing, to ensure thorough cleaning and drying without contamination, and includes the use of exhaust outlets to manage air flow and prevent foreign material introduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inner POD and outer POD are cleaned separately in distinct chambers, then cleaning efficiency and contamination prevention are improved, but device complexity increases
Solution Approach 1:
The cleaning system is divided into separate cleaning chambers for the inner POD and outer POD, allowing independent cleaning operations. This segmentation enables simultaneous processing of both PODs without cross-contamination, improving overall cleaning efficiency and productivity.
Solution Approach 2:
A transfer chamber serves as an intermediary between the cleaning chambers and the assembly chamber. This intermediary space allows for the safe transfer of cleaned PODs without exposing them to contamination sources, facilitating the separation process while maintaining cleanliness.
2Reliability
If cleaning and drying are performed in separate spaces, then contamination prevention is improved, but process complexity increases
Solution Approach 1:
The cleaning and drying processes are segmented into separate spatial zones within the cleaning system. The cleaning chamber removes contaminants while the drying chamber eliminates moisture, preventing re-contamination during the drying phase and improving reliability.
Solution Approach 2:
The system performs preliminary cleaning actions in the cleaning chamber before transferring to the drying chamber. This preliminary action ensures that contaminants are removed before the drying process begins, preventing contamination during subsequent drying operations.
3Productivity
If a one-way cleaning process is used, then cleaning efficiency is improved, but flexibility decreases
Solution Approach 1:
The cleaning process follows a continuous one-way flow from the cleaning chamber through the transfer chamber to the drying chamber, eliminating backtracking and repeated passages. This continuous action improves cleaning efficiency by ensuring all surfaces are processed in a single pass without re-contamination risks.
Solution Approach 2:
The system incorporates dynamic control of transfer mechanisms and chamber access to optimize the one-way process flow. While the cleaning path is fixed, the timing and sequencing of transfers can be dynamically adjusted to accommodate different POD types and cleaning requirements, maintaining flexibility.
4Reliability
If exhaust outlets are used to manage air flow, then contamination prevention is improved, but device complexity increases
Solution Approach 1:
The system uses pneumatic exhaust outlets to actively manage air flow and remove contaminants from the cleaning chambers. By controlling gas flow directions and pressures, the system prevents foreign material introduction while maintaining positive pressure differentials that protect cleaned surfaces.
Solution Approach 2:
The exhaust systems create controlled atmosphere management by removing oxygen and moisture from the cleaning environment. This inert-like environment prevents oxidation and contamination during the cleaning process, improving reliability without requiring actual inert gases.
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 process enhances cleaning efficiency by performing operations in one direction, preventing contamination, and effectively managing air flow to maintain cleanliness, thereby improving the overall efficiency and safety of POD cleaning.
Implementation Method 1
cleaning may include: injecting steam and a cleaning solution and thus cleaning the separation POD
Implementation Method 2
cleaning may include: injecting steam and a cleaning solution and thus cleaning the separation POD
Implementation Method 3
drying the cleaned separation POD preliminarily
Implementation Method 4
drying the cleaned separation POD preliminarily
Implementation Method 5
vacuum-processing the separation POD undergoing the drying
Implementation Method 6
vacuum-processing the separation POD undergoing the drying
Implementation Method 7
exhaust outlets to manage air flow and prevent foreign material introduction
Implementation Method 8
exhaust outlets to manage air flow and prevent foreign material introduction
Data Source
AI summary
Proposed is a POD cleaning process including: separating an introduced POD into an inner POD and an outer POD; cleaning a separation POD, which results from the separation, within a cleaning sub-chamber; drying the separation POD, which undergoes the cleaning, within a drying chamber; vacuum-processing the separation POD undergoing the drying; and assembling the inner POD and the outer POD that undergo the vacuum processing, in which the cleaning and the drying are separately performed.