Vertical Wafer Transfer Layout for High-Density Cluster Tools
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Solution Overview
Problem
Conventional wafer transfer systems in semiconductor processing cluster tools are inadequate for efficiently handling substrates, leading to reduced throughput and inefficiencies as the number of processing chambers increases, and they can cause thermal non-uniformity and particle contamination.
Innovation Solution
The introduction of a substrate processing system with a transfer chamber and chamber system that includes a robot with rotatable transfer apparatus and vertically translatable substrate supports, allowing for simultaneous processing and transfer of multiple substrates within a defined footprint, eliminating the need for conventional wafer carriers and enhancing access to additional processing chamber locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wafer transfer systems are used in cluster tools, then the system structure is simple, but substrate throughput decreases and thermal non-uniformity occurs
Solution Approach 1:
The patent transitions from conventional lateral wafer transfer to vertical substrate support movement. The substrate support moves vertically between a transfer region (accessible by robot) and processing regions, enabling multiple processing chambers to be accessed without increasing lateral footprint. This dimensional change allows higher throughput while maintaining manageable system complexity.
Solution Approach 2:
The processing system is segmented into distinct regions: a transfer region vertically accessible to the robot and multiple processing regions positioned at different vertical levels. The substrate support acts as a mobile platform that segments the transfer function from processing functions, allowing independent optimization of each region and improving overall throughput.
2Productivity
If the number of processing chambers is increased, then processing capacity improves, but thermal non-uniformity and particle contamination increase
Solution Approach 1:
By arranging processing regions vertically rather than laterally, the patent reduces the horizontal spread of the system. This vertical stacking minimizes thermal gradients across the system and reduces the risk of particle contamination from lateral transfers, while still accommodating multiple processing chambers for high capacity.
Solution Approach 2:
The substrate support acts as an intermediary carrier that isolates substrates from direct exposure to thermal gradients and contamination sources. By transferring substrates vertically through a controlled environment, the system minimizes thermal non-uniformity and particle contamination risks while maintaining high processing capacity.
3Adaptability or versatility
If conventional wafer carriers are used, then substrate handling is simple, but access to additional processing chamber locations is limited
Solution Approach 1:
The substrate support is designed as a dynamic, vertically translatable platform rather than a static carrier. This dynamic movement capability allows the support to access multiple processing chamber locations at different vertical levels, significantly increasing adaptability while the robot provides the necessary complexity for precise positioning.
Solution Approach 2:
The substrate support serves multiple functions: it acts as a carrier for substrates, a mobile platform for accessing different processing regions, and a positioning mechanism. This multi-functionality increases adaptability to various processing chamber configurations without proportionally increasing overall system complexity.
Data Source
AI summary
Exemplary substrate processing systems may include a factory interface and a load lock coupled with the factory interface. The systems may include a transfer chamber coupled with the load lock. The transfer chamber may include a robot configured to retrieve substrates from the load lock. The systems may include a chamber system positioned adjacent and coupled with the transfer chamber. The chamber system may include a transfer region laterally accessible to the robot. The transfer region may include a plurality of substrate supports disposed about the transfer region. Each substrate support of the plurality of substrate supports may be vertically translatable. The transfer region may also include a transfer apparatus rotatable about a central axis and configured to engage substrates and transfer substrates among the plurality of substrate supports. The chamber system may also include a plurality of processing regions vertically offset and axially aligned with an associated substrate support.