Vacuum Substrate Transport Preventing Oxidation
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Solution Overview
Problem
During substrate processing in microelectronic device fabrication, substrates undergo oxidation when transitioning from a vacuum environment to atmospheric pressure, requiring degas and preclean procedures that cause processing delays.
Innovation Solution
The development of a substrate transfer chamber system that maintains a vacuum environment throughout the transfer process by fluidly coupling the substrate transfer chamber to a load lock chamber, using an adapter plate and lift actuator to support and move substrate cassettes, minimizing exposure to atmospheric pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If substrate is transferred from vacuum chamber to atmospheric pressure chamber, then substrate can be loaded/unloaded from processing system, but substrate undergoes oxidation requiring additional degas/preclean steps
Solution Approach 1:
A transfer chamber is introduced as an intermediary component between the vacuum processing chamber and atmospheric load lock. The transfer chamber maintains vacuum conditions while enabling substrate cassette exchange, preventing oxidation during the transfer operation. This mediator chamber allows operators to load/unload substrates at atmospheric pressure in the load lock while the transfer chamber remains under vacuum, eliminating the need for additional degas/preclean steps.
2Ease of operation
If substrate is exposed to atmospheric pressure during transfer, then substrate can be accessed for processing, but oxidation forms on substrate surface
Solution Approach 1:
The system is segmented into distinct pressure zones: a vacuum processing chamber, a vacuum transfer chamber, and an atmospheric load lock. The transfer chamber acts as a vacuum barrier that segments the atmospheric environment from the vacuum environment. Substrate cassettes are transferred through this segmented interface, allowing substrate accessibility for loading/unloading at atmospheric pressure while maintaining vacuum isolation to prevent oxidation during the critical transfer phase.
3Reliability
If additional degas and preclean procedures are added, then oxidation is removed from substrates, but processing efficiency decreases
Solution Approach 1:
The transfer chamber performs the protective action preliminarily by maintaining vacuum conditions during substrate transfer before the substrate enters the processing sequence. This preliminary vacuum protection prevents oxidation from occurring in the first place, rather than requiring corrective degas/preclean actions afterward. The substrate arrives at the processing chamber already protected, eliminating redundant steps and improving overall processing efficiency while maintaining substrate quality.
Data Source
AI summary
Embodiments of substrate transfer apparatus are provided herein. In some embodiments, an apparatus for storing and transporting at least one substrate in a vacuum includes a carrying case for storing one or more substrates, wherein the carrying case includes a vacuum port and a plurality of holders to hold one or more substrates within an inner volume of the carrying case; and a vacuum source in fluid connection with the carrying case via the vacuum port.