Load Lock Interface With Service Tunnel For Maintenance Access
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Solution Overview
Problem
Semiconductor fabrication facilities face challenges in maximizing productivity due to limited and expensive space, requiring efficient space utilization while maintaining adequate access for maintenance and service, which is complicated by the close packing of process modules and limited access to equipment.
Innovation Solution
A compact cluster tool architecture is implemented with a service tunnel defined below the wafer transport assembly, utilizing subfloor space to provide access and flexibility in wafer movement, including buffers that maintain a controlled environment and allow for efficient configuration of wafer transport paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If process modules are closely packed to maximize space utilization, then space efficiency improves, but access for maintenance and service deteriorates
Solution Approach 1:
The service tunnel is positioned beneath the wafer transport assembly, utilizing the vertical dimension and subfloor space to provide maintenance access. This allows process modules to be closely packed on the fabrication floor while technicians can access equipment through the underground tunnel, resolving the contradiction between space utilization and maintenance access
Solution Approach 2:
The service tunnel acts as an intermediary space between the fabrication floor and the equipment requiring maintenance. It provides a dedicated pathway for technicians and materials to reach process modules without disrupting the closely packed layout on the main floor
2Ease of operation
If a service tunnel is defined below the wafer transport assembly, then maintenance access improves, but device complexity increases
Solution Approach 1:
The service tunnel serves multiple functions: it provides maintenance access to process modules, houses gas boxes and utilities, and supports the wafer transport assembly. By consolidating these functions into a single underground structure, the system achieves improved maintenance access without proportionally increasing complexity
Data Source
AI summary
A load lock assembly includes a first load lock connected between an equipment front end module (EFEM) and a wafer transport module, the EFEM being at a lab ambient condition, the wafer transport module being at a vacuum condition, the wafer transport module being part of a wafer transport assembly that is configured to transport wafers to and from one or more process modules that are connected to the wafer transport assembly; a second load lock disposed over the first load lock, the second load lock connected between the EFEM and the wafer transport module; a post-processing module disposed over the second load lock, the post-processing module configured for performing a post-processing operation on a processed wafer that has been processed in at least one of the process modules that are connected to the wafer transport assembly, the post-processing module being configured for connection to the wafer transport module.