Dynamic Transport Sequencing in Semiconductor Cluster Tools
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cluster tools in semiconductor manufacturing face inefficiencies due to static transport sequencing rules, which fail to adapt to dynamic situations such as varying lot sizes and complex process flows, leading to suboptimal tool performance and increased production costs.
Innovation Solution
A dynamic control mechanism for the automated substrate handling system that adjusts transport sequencing rules based on real-time process information, allowing for flexible prioritization and optimization of substrate handling to maximize tool throughput and minimize idle time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If static transport sequencing rules are used in cluster tools, then the control mechanism is simple and stable, but tool performance and throughput are suboptimal due to inability to adapt to dynamic situations
Solution Approach 1:
The patent applies dynamics by transforming the static transport sequencing rules into dynamic rules that can adapt to changing process conditions. The control mechanism now responds to real-time parameters such as lot size variations and process module status, allowing the substrate handling system to optimize throughput dynamically rather than following fixed predetermined sequences.
Solution Approach 2:
The patent implements feedback mechanisms where the substrate handling system continuously monitors process information from multiple sources including process modules, load ports, and transport activities. This feedback loop enables the control mechanism to adjust transport sequencing decisions based on actual system state, improving throughput by responding to dynamic conditions rather than relying on static rules.
2Adaptability or versatility
If static transport sequencing rules are used, then the system is easy to operate and maintain, but it fails to respond to varying lot sizes and complex process flows
Solution Approach 1:
The patent makes the transport sequencing rules dynamic by enabling them to adapt to varying lot sizes and process conditions. The system automatically adjusts substrate transport priorities and sequences based on real-time information about lot characteristics, process module availability, and transport status, thereby achieving versatility without sacrificing operational simplicity.
Solution Approach 2:
The substrate handling system performs self-service by automatically adjusting its own transport sequencing based on monitored process conditions. The control mechanism uses embedded logic to respond to varying lot sizes and process flows without requiring external intervention or complex manual programming, maintaining ease of operation while achieving high adaptability.
3Productivity
If dynamic control mechanism is implemented, then tool performance and throughput are optimized, but the control mechanism becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the control mechanism into modular functional components: substrate handling system, process modules, load ports, and transport sequencing rules. Each component operates with defined responsibilities and interfaces, allowing the dynamic control system to be managed through discrete, manageable units rather than as a monolithic complex system, thereby reducing the practical complexity burden.
Solution Approach 2:
The patent implements universality by designing a control mechanism that performs multiple functions: monitoring process information, determining transport priorities, sequencing substrate movements, and adapting to various lot sizes and process configurations. This multi-functional approach consolidates what could be multiple separate systems into one unified control mechanism, optimizing productivity while containing complexity through functional integration.
Data Source
AI summary
By dynamically adapting the transport sequencing rules of a cluster tool, the overall performance of the tool may be increased. In some illustrative embodiments, the transport sequencing rule for a robot handler may be dynamically changed when a lot of small size is present in one of the load ports in order to increase the window of opportunity for carrier exchange of a standard lot size currently processed. Consequently, by reducing the overall process time for the currently processed lot while delaying the completion of the small lot, the currently processed carrier may be exchanged earlier, thereby reducing the overall cycle time of the currently processed lot and/or providing a next lot earlier to the tool.