Wafer Transfer Arm Position Feedback for Uniform Edge Coating
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Solution Overview
Problem
The existing semiconductor manufacturing processes face challenges in achieving uniformity of the coating width of the coating film applied only to the outer peripheral portion of semiconductor wafers due to misalignment and wear in the transfer mechanisms, leading to non-uniform coating.
Innovation Solution
A semiconductor manufacturing apparatus is designed with a position detection unit to correct the position of the transfer arm based on real-time detection, ensuring precise alignment of the wafer to the spin chuck, thereby maintaining uniform coating width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transfer mechanism is used to convey the semiconductor wafer, then the wafer can be transferred from the wafer carrier to the coating unit, but misalignment and wear in the transfer mechanism cause non-uniform coating width
Solution Approach 1:
A position detection unit detects the position of the transfer arm, and the detected position information is fed back to a control unit that calculates correction amounts and adjusts the transfer arm's position, thereby compensating for alignment errors and maintaining uniform coating width
Solution Approach 2:
The patent replaces pure mechanical positioning with a combination of mechanical transfer and optical/electronic position detection, using detection units and control systems to substitute for mechanical precision alone
2Productivity
If the transfer arm is used repeatedly for wafer transfer, then productivity is improved, but wear in the transfer mechanism leads to position misalignment
Solution Approach 1:
The position detection unit continuously monitors the transfer arm's position during repeated operations, and the control unit applies real-time corrections based on detected deviations, compensating for wear-induced misalignment and maintaining positioning accuracy
Solution Approach 2:
The system performs position detection and correction before each coating operation, proactively compensating for accumulated wear effects rather than allowing them to degrade performance
3Device complexity
If the transfer arm position is not corrected, then the device complexity is reduced, but the coating width uniformity deteriorates
Solution Approach 1:
The position detection and correction system provides feedback control that automatically compensates for transfer arm position deviations, achieving high coating uniformity without requiring overly complex mechanical precision
Data Source
AI summary
A semiconductor manufacturing apparatus includes a substrate storage unit configured to store a semiconductor wafer W, a substrate processing unit including a rotation holding unit configured to rotate the semiconductor wafer W while holding the semiconductor wafer W, and a coating liquid supply unit configured to supply a coating liquid onto the semiconductor wafer W, a substrate transfer unit including a transfer arm configured to take out the semiconductor wafer W and transfer the semiconductor water W to the rotation holding unit, and a moving mechanism configured to move the transfer arm, and a position detection unit configured to detect the position of the transfer arm. The moving mechanism moves the transfer arm onto the rotation holding unit while correcting the position of the transfer arm based on the position detection result of the transfer arm by the position detection unit.