Integrated Wafer Inspection Station for Real-Time Defect Detection

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Solution Overview

Problem

Conventional semiconductor workpiece inspection methods do not allow for real-time defect detection during processing, leading to potential damage and waste of unfinished wafers.

Innovation Solution

Integration of defect sensors within the processing workstation to inspect semiconductor workpieces during transport and processing, utilizing various types of sensors such as optical, weight, and temperature sensors, and implementing inspection stations with rotating pedestals for comprehensive defect analysis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If inspection is performed after processing is completed, then the inspection equipment can be separate and simple, but semiconductor workpieces may become damaged or unusable during transport and processing without detection

Engineering Contradiction:

Improveworkpiece integrityVSAvoidinspection system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the inspection station with the processing workstation by integrating defect sensors into the existing processing chamber and transfer chamber. The inspection chamber shares physical space and infrastructure with processing operations, allowing simultaneous inspection and processing without requiring separate standalone inspection equipment.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The processing workstation is designed to perform multiple functions: it can process semiconductor workpieces in the processing chamber, transport them via the robotic arm, and inspect them for defects using defect sensors in both the processing and transfer chambers. This multi-functional design eliminates the need for dedicated separate inspection equipment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Loss of time

If inspection is performed during transport and processing, then real-time defect detection is achieved, but the workstation structure becomes more complex with additional sensors and inspection chambers

Engineering Contradiction:

Improvetime to detect defectsVSAvoidworkstation structure

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The defect sensors are positioned to continuously inspect workpieces during their entire journey through the workstation - both during transport in the transfer chamber and during processing in the processing chamber. This continuous inspection approach detects defects in real-time without interrupting the normal flow of workpiece processing.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The patent uses the existing robotic arm and chamber structures as intermediaries to enable inspection. The defect sensors are integrated into the chamber walls and transfer paths, using the existing mechanical infrastructure as a platform for inspection rather than requiring completely separate inspection machinery.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If multiple defect sensors are deployed in processing and transfer chambers, then comprehensive defect detection is achieved, but the number of components and system complexity increases

Engineering Contradiction:

Improvedefect detection accuracyVSAvoidnumber of sensors

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Different defect sensors are strategically positioned in different locations within the processing and transfer chambers to detect specific types of defects relevant to each zone. The inspection system is configured with sensors oriented to detect defects from multiple angles and positions, providing comprehensive coverage without uniformly distributing sensors throughout the entire workstation.

Inventive Principle:

Principle #3Local quality

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

Enables real-time detection of defects, reducing wafer damage and improving fabrication yield by identifying and remediating issues promptly.

Implementation Method 1

utilizing various types of sensors such as optical, weight, and temperature sensors

Methodology Applied

Scientific EffectOptical sensing:

Implementation Method 2

utilizing various types of sensors such as optical, weight, and temperature sensors

Methodology Applied

Scientific EffectWeight sensing:

Implementation Method 3

utilizing various types of sensors such as optical, weight, and temperature sensors

Methodology Applied

Scientific EffectTemperature sensing:

Data Source

PatentUS12482682B2Systems and methods for inspection stations

Publication Date: 2025.11.25 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

A workstation includes: a processing chamber configured to process a workpiece; a load port configured to interface with an environment external to the workstation; a robotic arm configured to transfer the workpiece between the load port and the processing chamber; and a defect sensor configured to detect a defect along a surface of the workpiece when transferred between the load port and the processing chamber.