Wafer Polishing-to-Cleaning Transfer for Precise Wet Bath Loading
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Solution Overview
Problem
Current semiconductor wafer processing systems lack automation in transferring wafers from polishers to wet baths for cleaning, leading to inefficiencies and increased production costs due to the need for manual handling, which can result in wafer damage.
Innovation Solution
A semiconductor wafer processing system that includes a controller, a transfer robot, a wet bath, and an automated guided vehicle (AGV) to automate the transfer and cleaning of wafers, using a cassette to hold the wafers and ensuring precise positioning to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual transfer using vacuum pencils is used, then wafer handling is simple and equipment cost is low, but production efficiency is low and wafer damage risk increases
Solution Approach 1:
The system enables automated self-service transfer where the robot arm with vacuum pencil automatically picks up wafers from the polisher and places them in the wet bath without human intervention, thereby increasing productivity while maintaining relatively simple equipment structure
Solution Approach 2:
The robot arm serves multiple functions: it transfers wafers between different stations (polisher to wet bath), positions cassettes, and handles various wafer manipulation tasks, replacing multiple specialized manual operations with a single multi-functional device
2Productivity
If automated robot transfer is implemented, then production efficiency increases, but wafer damage risk increases due to lack of precision handling
Solution Approach 1:
The system replaces manual mechanical handling with automated robotic manipulation controlled by a PLC, using vacuum pencils for contactless or minimal-contact wafer handling, thereby maintaining wafer integrity while achieving automation
Solution Approach 2:
The controller receives feedback from sensors and operators to adjust robot arm movements and vacuum pencil positioning, ensuring precise and gentle wafer handling that prevents damage while maintaining high transfer speed
3Ease of manufacture
If manual wafer transfer is used, then equipment cost is low, but production cost increases due to lower efficiency
Solution Approach 1:
The automated transfer system is divided into modular components (robot arm, vacuum pencils, controller, cassette system) that can be independently manufactured and assembled, reducing overall equipment cost while enabling automated high-efficiency operation
Data Source
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AI summary
A semiconductor wafer processing system for processing a set of semiconductor wafers includes a controller, a transfer robot controlled by the controller, a wet bath for containing a cleaning solution, and a cassette positioned in the wet bath for holding the set of wafers. The transfer robot transfers the wafer from a transfer location to the cassette and the controller controls the transfer robot during the transfer.