Dual-Arm Substrate Transfer for Shorter Cool-Down Cycles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The reduced thickness of epitaxial layers in semiconductor manufacturing has shifted the limiting time factor from deposition operations to substrate loading and unloading, leading to prolonged downtime and reduced throughput due to delays in substrate handling.
Innovation Solution
A transfer robot with two arms is used to manage substrates, allowing simultaneous handling of a first substrate in a processing chamber and a second substrate in a cool-down chamber, with an adjusted cool-down time determined by accounting for wait times in a transfer chamber using a cooling variable to optimize substrate cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If substrate loading and unloading operations are performed sequentially using a single-arm transfer robot, then device complexity is reduced, but productivity decreases due to prolonged downtime and reduced throughput
Solution Approach 1:
The transfer robot is configured with two independently controllable arms that can operate dynamically and simultaneously. The first arm handles substrate removal from the processing chamber while the second arm handles substrate loading, allowing parallel operations that reduce overall cycle time and improve throughput without requiring a complete system redesign
Solution Approach 2:
The transfer robot is segmented into two separate arms with distinct functions: the first arm is dedicated to substrate removal operations while the second arm is dedicated to substrate loading operations. This segmentation allows each arm to specialize in its specific task and operate independently, eliminating the sequential bottlenecks of a single-arm system
2Ease of operation
If substrates are held in the transfer chamber for extended periods, then ease of operation is improved by allowing flexible scheduling, but loss of time increases due to prolonged cool-down requirements
Solution Approach 1:
The system performs preliminary cooling actions by allowing substrates to cool partially in the transfer chamber before moving them to the cool-down chamber. The controller tracks the wait time in the transfer chamber and uses this information to adjust the subsequent cool-down time, effectively performing some cooling work earlier in the process
Solution Approach 2:
The controller implements a feedback mechanism that monitors the actual wait time of substrates in the transfer chamber and uses this information to dynamically adjust the cool-down time. By determining a cool-down factor based on the tracked wait time, the system optimizes the total cooling duration and reduces unnecessary cooling time
Data Source
AI summary
A method and apparatus for reducing cool-down times within a cool-down chamber are described herein. The method and apparatus include a process chamber, a transfer chamber, a dual-handled transfer robot within the transfer chamber, and a cool-down chamber. The dual-handled transfer robot it utilized to transfer a substrate between the process chamber and the cool-down chamber. The amount of time the substrate is disposed on the dual-handled transfer robot before being moved into the cool-down chamber is multiplied by a correction factor and subtracted from an original cool down time to achieve an adjusted cool down time. The adjusted cool down time is determined separately for each substrate being cooled within the cool-down chamber.