Electroplating Seal Inspection Using Rotating Laser Plate-Up Detection
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Solution Overview
Problem
Conventional methods for inspecting and cleaning electroplating seals in semiconductor processing are inefficient, leading to inconsistent cleaning, increased operating costs, and potential substrate damage due to residue buildup, as they rely on manual visual inspection and labor-intensive processes that are time-consuming and prone to errors.
Innovation Solution
An automated system with a module that rotates the seal and uses a laser and receiver to detect residual material by scanning the exterior surface, producing a smoothed signal to identify slope changes indicative of plate-up, triggering a cleaning operation or preventing repositioning within the electroplating chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual visual inspection is used to detect plate-up, then operational simplicity is maintained, but detection precision and consistency deteriorate
Solution Approach 1:
The patent replaces manual visual inspection with an automated optical detection system using a laser scanner and photodetector. The laser beam scans the seal surface and detects plate-up through light reflection changes, eliminating the need for manual inspection while significantly improving detection precision and consistency.
Solution Approach 2:
The system enables self-detection and self-cleaning functionality where the automated detection system identifies plate-up conditions and triggers the cleaning mechanism automatically, without requiring manual intervention for either detection or cleaning operations.
2Reliability
If automated cleaning operations are performed, then cleaning consistency improves, but mechanical wear and operating costs increase
Solution Approach 1:
The system uses feedback control where the detection system continuously monitors the seal surface and provides real-time information about plate-up conditions. The controller adjusts cleaning operations based on actual contamination levels, enabling cleaning only when necessary and reducing mechanical wear while maintaining consistency.
Solution Approach 2:
Instead of performing continuous or frequent cleaning operations, the system applies cleaning actions only when plate-up is detected above threshold levels. This partial action approach reduces mechanical wear on cleaning elements while maintaining sufficient cleaning effectiveness.
3Reliability
If frequent cleaning operations are performed, then seal cleanliness is improved, but processing downtime increases
Solution Approach 1:
The detection system continuously monitors the seal surface for plate-up conditions before they reach critical levels. By detecting contamination early and triggering cleaning operations proactively, the system prevents substrate damage while minimizing interruptions to processing operations.
Solution Approach 2:
The optical detection system enables precise identification of plate-up conditions without requiring frequent manual inspections or preventive cleaning cycles, reducing processing downtime while maintaining seal cleanliness through targeted automated cleaning only when necessary.
4Productivity
If manual inspection intervals are extended, then productivity is improved, but substrate damage risk increases
Solution Approach 1:
The automated optical detection system continuously or frequently monitors the seal surface between substrate processing operations, enabling early detection of plate-up conditions without interrupting production. This eliminates the trade-off between inspection frequency and productivity while preventing substrate damage through timely cleaning.
Solution Approach 2:
The continuous feedback from the detection system allows for real-time monitoring of seal condition during production runs, enabling proactive cleaning decisions that prevent plate-up from reaching levels that would cause substrate damage, thereby maintaining both high productivity and substrate safety.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides consistent and rapid identification of residual material, reducing processing downtime and minimizing wafer loss by ensuring thorough cleaning and preventing substrate damage through precise automated inspection and cleaning.
Implementation Method 1
The detector may be or include a laser and a receiver mounted on a post extending from a deck plate of the module. The laser may be or include a light beam characterized by a light beam width. The receiver may be configured to receive reflected light of the laser from the seal.
Data Source
AI summary
Systems for electroplating seal inspection may include a module configured to support a seal for inspection. The module may include a set of supports positioned to contact an interior rim of the seal. The module may be configured to rotate the seal about a central axis. The system may also include a detector positioned on the module. The detector may be positioned to scan an exterior surface of the seal.