Wafer Transfer Layout for Interference-Free Batch-to-Single Processing
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Solution Overview
Problem
Existing substrate processing systems face inefficiencies in transferring substrates between batch and single-wafer processing sections, leading to interference and reduced productivity due to overlapping movement paths of transfer arms.
Innovation Solution
A substrate processing system with a second interface section that includes a second transfer arm to independently operate from a first transfer arm, allowing for simultaneous and interference-free transfer of substrates between batch and single-wafer processing, using a third transfer arm to handle individual substrates, and utilizing a second rinse liquid to prevent pattern collapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transfer arm is used to move substrates between batch and single-wafer processing sections, then the device complexity is reduced, but the productivity decreases due to interference and overlapping movement paths
Solution Approach 1:
The transfer function is segmented into two independent transfer arms: the first transfer arm handles lot-level transfers between batch and single-wafer processing sections, while the third transfer arm handles individual substrate transfers within the single-wafer processing section. This segmentation eliminates movement path interference and enables parallel operations, resolving the contradiction between device simplicity and transfer efficiency.
2Device complexity
If transfer arms share overlapping movement paths, then the device complexity is reduced, but the reliability decreases due to potential interference and operational conflicts
Solution Approach 1:
The transfer system is divided into separate functional zones with dedicated transfer arms: the first transfer arm operates in the lot transfer zone between batch and single-wafer sections, while the third transfer arm operates in the substrate-level zone within the single-wafer processing section. This spatial segmentation eliminates path interference and operational conflicts, ensuring reliable concurrent operations.
Solution Approach 2:
The second rinse bath serves as an intermediary zone where substrates are temporarily held after lot immersion and before individual substrate transfer. This intermediary positioning allows the first and third transfer arms to operate independently without direct path interference, improving operational reliability.
3Manufacturing precision
If substrates are transferred one by one from batch to single-wafer processing, then the manufacturing precision is improved, but the loss of time increases due to sequential handling
Solution Approach 1:
The entire lot of substrates is pre-immersed and pre-processed together in the batch processing section and second rinse bath before individual substrate transfer. This preliminary batch processing maintains manufacturing precision while minimizing the time spent on sequential operations, as the time-consuming immersion process occurs once for the entire lot rather than repeatedly for each substrate.
Data Source
AI summary
A substrate processing method includes: transferring, by a first transfer arm, a wafer lot including a plurality of substrates to a processing bath in which the plurality of substrates in the wafer lot are immersed and processed collectively; receiving, by a second transfer arm, the wafer lot from the first transfer arm, and immersing the wafer lot in an immersion bath in which the plurality of substrates in the wafer lot are immersed collectively; and transferring, by a third transfer arm, the plurality of substrates in the wafer lot to a delivery table one by one. The immersion bath is disposed outside a movement range of the first transfer arm such that the first transfer arm is operated independently from the third transfer arm.