Buffer Chamber Time-Out Control for Semiconductor Substrate Handling
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Solution Overview
Problem
In semiconductor processing systems, substrates often become stranded in the buffer chamber for extended durations due to unavailability of destination chambers, leading to reduced throughput and potential quality issues.
Innovation Solution
Implementing a buffer chamber time-out operation that suspends substrate movement from load lock chambers to transfer chambers and identifies a destination chamber for substrates that have been in the buffer chamber longer than a predetermined duration, allowing for their removal and re-routing to available processing chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If substrates are stored in the buffer chamber when destination chambers are unavailable, then substrate storage capacity is improved, but substrate residence time increases leading to quality degradation
Solution Approach 1:
The controller continuously monitors substrate residence time in the buffer chamber and compares it against a predetermined threshold. When the threshold is exceeded, the controller automatically initiates a time-out operation to suspend load lock operations and prevent further substrate accumulation, thereby resolving the contradiction between storage capacity and residence time by implementing closed-loop feedback control
Solution Approach 2:
The system preemptively suspends substrate loading into the buffer chamber before quality degradation occurs by monitoring residence time and triggering the time-out operation when the predetermined duration is reached. This preliminary action prevents the worsening of substrate quality while maintaining optimal buffer utilization
2Productivity
If substrates are continuously transferred to the buffer chamber, then throughput is improved, but substrate quality deteriorates due to excessive residence time
Solution Approach 1:
The system dynamically adjusts the buffer chamber operation mode between normal transfer and time-out suspension based on real-time substrate residence time conditions. The controller switches operational states to maintain optimal balance between throughput and quality, implementing dynamic control rather than static operation
Solution Approach 2:
The controller uses feedback from substrate residence time monitoring to dynamically control the transfer operation, suspending transfers when quality thresholds are approached and resuming when conditions improve, thereby maintaining high throughput while preventing quality degradation
Data Source
AI summary
Implementations described herein generally relate to a method and apparatus for processing substrates in a processing system. The method includes identifying, in a buffer chamber coupled to a transfer chamber of a processing system, a first substrate that has been in the buffer chamber longer than a predetermined duration and identifying a first destination chamber of the processing system for the first substrate. After identifying the first substrate, a buffer chamber time-out operation is performed. The buffer time out operation includes suspending movement of substrates from a load lock chamber to the transfer chamber and removing the first substrate from the buffer chamber.