Wafer Transfer Control for Substrate Processing
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Solution Overview
Problem
Conventional substrate processing apparatuses face productivity degradation due to the need for long maintenance times and disassembly/installation tasks, as production wafers are prevented from being loaded into process chambers during quality control checks, leading to inefficient operation modes.
Innovation Solution
Implementing a method that allows for separate operation modes within the substrate processing apparatus, including a maintenance mode, a quality control (QC) mode, and a production mode, where the transfer mechanism inhibits the transfer of production wafers during QC checks and quality control wafers during production, enabling efficient processing by designating specific process chambers for each task and ensuring QC checks are completed before processing production wafers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the process chamber is separated during QC check to prevent production wafers from being loaded, then the quality control is ensured, but the maintenance time becomes long and productivity is degraded
Solution Approach 1:
The patent segments the wafer transfer control into different modes: maintenance mode where no wafers are transferred, QC mode where only QC wafers are transferred, and production mode where production wafers are transferred. This segmentation allows simultaneous QC checks and production operations in different chambers, resolving the contradiction between ensuring quality control and maintaining productivity.
Solution Approach 2:
The system dynamically switches between different operation modes (maintenance mode, QC mode, production mode) based on the current state of process chambers. The transfer mechanism adaptively controls wafer transfers according to the selected mode, enabling flexible operation that maintains both quality control and productivity.
2Ease of repair
If disassembling and installation work of the process chamber is required during maintenance, then the maintenance can be performed, but the maintenance time is long
Solution Approach 1:
The patent divides the maintenance operations into chamber-level segments where individual chambers can be maintained independently without affecting others. The transfer mechanism continues to operate in other chambers during maintenance, eliminating the need for complete system shutdown and reducing overall maintenance time.
Solution Approach 2:
The system maintains continuous production operations in chambers that are not undergoing maintenance while maintenance is performed on specific chambers. The transfer mechanism operates continuously across the system, ensuring that useful actions (wafer processing) continue without interruption in unaffected chambers.
Data Source
AI summary
Only a wafer for QC check may be transferred and a production wafer may prevent from being transferred into an assigned process chamber whose QC check is not completed after a maintenance task, and the production wafer may be processed the assigned process chamber after the completion of the QC check. The wafer for QC check is transferred while inhibiting a transfer of the production wafer into the assigned process chamber, and the production wafer is transferred into each of the process chambers of the plurality except the assigned process chamber.