Maglev Substrate Transfer Chamber for Bidirectional Vacuum Handling
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Solution Overview
Problem
Conventional substrate transfer systems in semiconductor manufacturing are limited by their unidirectional movement capabilities and large footprints, which restrict flexibility and efficiency in moving substrates between process chambers and load locks without breaking vacuum.
Innovation Solution
A bi-directional magnetic levitation platform with two facing tracks, one at the top and one at the bottom of the transfer chamber, allows substrate carriers with dual magnet configurations to move in both directions, facilitated by lift pin assemblies that maintain vacuum integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional substrate carriers with single-direction tracks are used, then the system structure is simple, but the movement flexibility and adaptability are limited
Solution Approach 1:
The patent transitions from a single-plane horizontal track system to a three-dimensional system with horizontal tracks at different heights (first height and second height) connected by vertical lift mechanisms. This dimensional change enables bidirectional movement and flexible substrate routing between process chambers without increasing horizontal footprint, resolving the contradiction between movement flexibility and system complexity.
2Area of stationary object
If conventional substrate carriers with large footprint are used, then all movement directions can be accommodated, but the space utilization is inefficient
Solution Approach 1:
By introducing vertical dimension with lift pins and multiple elevated tracks, the system achieves bidirectional substrate movement capabilities without expanding horizontal footprint. The vertical stacking of tracks at different heights allows substrates to be transported in multiple directions within a compact footprint, efficiently resolving the space utilization versus movement flexibility contradiction.
3Productivity
If vacuum breaks are required for substrate loading/unloading, then the load lock operations are simplified, but the processing continuity and productivity are reduced
Solution Approach 1:
The patent replaces mechanical contact-based substrate transfer (requiring vacuum breaks) with magnetic levitation technology. The magnetically levitated substrate carrier can be transferred through the load lock without breaking vacuum, as the magnetic field penetrates the load lock barrier. This substitution maintains processing continuity and productivity while managing vacuum requirements, resolving the contradiction between processing continuity and vacuum maintenance complexity.
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 solution enables flexible, bidirectional substrate movement within a compact, vacuum-maintained environment, enhancing throughput and reducing the need for vacuum breaks during processing.
Implementation Method 1
a first magnetic levitation track disposed at a first height within the transfer chamber, wherein the first magnetic levitation track has a face-up orientation configured to generate a first magnetic field above the first magnetic levitation track
Implementation Method 2
a second magnetic levitation track disposed at a second height within the transfer chamber, wherein the second magnetic levitation track has a face-down orientation configured to generate a second magnetic field below the first magnetic levitation track
Implementation Method 3
each substrate carrier of the plurality of substrate carriers comprises a first magnet on a bottom of the substrate carrier to interact with the first magnetic field
Implementation Method 4
a second magnet on a top of the substrate carrier to interact with the second magnetic field
Implementation Method 5
at least one lift pin assembly configured to move the plurality of substrate carriers in a vertical direction between the first magnetic levitation track and the second magnetic levitation track
Data Source
AI summary
Disclosed herein are systems and methods relating to a transfer chamber for an electronic device processing system. The transfer chamber can include a first magnetic levitation track having a face-up orientation and a second magnetic levitation track spaced from the first magnetic levitation track and having a face-down orientation. The system can include substrate carriers that move along the first and second magnetic levitation tracks where each substrate carrier includes a magnet on a bottom portion to interact with a first magnetic field and a second magnet on a top portion to interact with a second magnetic field. The system also can include at least one lift pin assembly to move the substrate carriers in a vertical direction between the first and second magnetic levitation tracks.