Inline Lithography Track Vacuum Interface for Contamination Control
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Solution Overview
Problem
Existing semiconductor manufacturing processes face challenges with stand-alone scanners causing process delays, contamination, and productivity issues due to metal reaction by-products, especially in all-in-one track systems where wafer movement is independent, leading to critical dimension drift and productivity deterioration.
Innovation Solution
A lithography track system with an in-line scanner and interface boxes that transfer wafers under normal pressure to a vacuum state, integrating a transfer module and scanner to maintain vacuum matching, allowing continuous dry photolithography processes without external movement, and including plasma devices for contamination prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stand-alone scanner is used for exposure, then the scanner can be operated independently, but process delays occur and productivity deteriorates
Solution Approach 1:
The scanner is integrated into the all-in-one track system, merging previously separate operations (coating, exposure, baking, developing) into a continuous in-line process. This eliminates independent scanner operation delays while maintaining operational independence through automated sequencing, resolving the contradiction between ease of operation and productivity.
Solution Approach 2:
The system implements continuous wafer processing through the all-in-one track, where wafers move continuously through coating, exposure, baking, and developing modules without interruption. This continuous action eliminates the process delays that occurred with stand-alone scanners, improving productivity while maintaining operational independence through automated control.
2Adaptability or versatility
If a stand-alone scanner is used, then the scanner configuration is flexible, but wafer contamination occurs due to metal reaction by-products
Solution Approach 1:
By merging the scanner into the all-in-one track system, the design eliminates the need for separate wafer transfer between independent modules. This integration prevents metal reaction by-products from contaminating wafers during transfer operations, while the system maintains adaptability through modular process module design that can be configured for different semiconductor fabrication needs.
Solution Approach 2:
The system introduces a controlled environment within the all-in-one track that acts as an intermediary between the scanner and wafer handling processes. This controlled environment prevents metal outgassing and reaction by-products from reaching the wafers, eliminating contamination while preserving scanner configuration flexibility through the modular architecture.
3Device complexity
If independent wafer movement is used between all-in-one track and scanner, then system modularity is maintained, but critical dimension drift occurs
Solution Approach 1:
The scanner is merged into the all-in-one track system as an integrated module, eliminating independent wafer movement between separate systems. This integration prevents critical dimension drift caused by wafer handling and positioning variations, while the system maintains modularity through standardized process modules that can be independently configured and maintained.
Solution Approach 2:
The continuous in-line processing eliminates interruptions and re-positioning of wafers between independent systems. Wafers move continuously through the integrated scanner and process modules, maintaining consistent positioning and preventing critical dimension drift, while the modular architecture preserves system flexibility for different fabrication requirements.
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 ensures continuous photolithography processes, reduces contamination, minimizes process delays, and enhances productivity by maintaining vacuum integrity and reducing the need for additional cleaning devices, thereby refining semiconductor chip patterns effectively.
Implementation Method 1
a scanner at one end of the transfer module and configured to expose a photoresist material on the wafer
Implementation Method 2
a first interface box sharing the transfer module and configured to transfer the wafer to the scanner and to match vacuum degrees or levels of the transfer module and the scanner
Data Source
AI summary
A lithography track system includes a plurality of process modules each configured to perform a photolithography process on a wafer, a transfer module configured to transfer the wafer between the plurality of process modules, a scanner at one end of the transfer module and configured to expose a photoresist material on the wafer, and a first interface box sharing the transfer module and configured to transfer the wafer to the scanner and to match vacuum degrees of the transfer module and the scanner.