Electrostatic Chuck Conduit Check Using Thermochromic Blockage Detection

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Solution Overview

Problem

The build-up of particles in conduits of electrostatic chucks obstructs gas passage, leading to potential damage of semiconductor wafers and negatively impacts wafer quality, requiring manual disassembly for inspection, which is time-consuming and resource-intensive.

Innovation Solution

A conduit check apparatus with a thermochromic structure that automatically identifies conduit statuses by detecting temperature changes due to gas emission, using a heating assembly and thermochromic material to provide visual indications of blockage levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual disassembly is used for conduit inspection, then inspection can be performed, but it is time-consuming and resource-intensive

Engineering Contradiction:

Improveconduit status detectionVSAvoidinspection time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces manual mechanical disassembly with an automated thermal detection system. A heating assembly applies controlled heat to the electrostatic chuck, and thermochromic material visually indicates conduit blockage status through color changes, eliminating the need for manual disassembly while maintaining detection accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system enables self-diagnosis of conduit status through automated thermal response measurement. The electrostatic chuck itself participates in the detection process by responding to applied heat, with the thermochromic material providing visual feedback about conduit blockage without requiring external manual inspection.

Inventive Principle:

Principle #25Self-service

2Measurement precision

If manual disassembly is used for conduit inspection, then conduit blockage can be detected, but it requires significant resources

Engineering Contradiction:

Improveconduit blockage detectionVSAvoidinspection efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent replaces resource-intensive manual disassembly operations with an automated thermal detection system using heating assemblies and thermochromic indicators. This substitution maintains conduit blockage detection capability while dramatically improving inspection efficiency by eliminating manual labor requirements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The thermochromic material serves as an intermediary that translates internal conduit blockage status into visible color changes. This intermediary enables indirect detection of conduit status without requiring physical access to or disassembly of the conduit system, thereby improving productivity while maintaining detection accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If conduit blockage is not detected timely, then resource-efficient inspection is maintained, but wafer damage may occur

Engineering Contradiction:

Improveinspection efficiencyVSAvoidwafer protection

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs preliminary thermal testing to detect conduit blockages before they cause wafer damage. By applying heat and observing thermochromic responses in advance, the system identifies blocked conduits that would otherwise go undetected until wafer processing issues arise, thereby protecting wafer quality while maintaining inspection efficiency.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The thermochromic material provides immediate visual feedback about conduit blockage status through color changes. This feedback mechanism enables operators to quickly identify and address blocked conduits, preventing wafer damage while maintaining high inspection efficiency through rapid, visual status indication.

Inventive Principle:

Principle #23Feedback

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 quick and resource-efficient detection of conduit blockages without disassembling the electrostatic chuck, allowing for timely maintenance and preventing wafer damage.

Implementation Method 1

the first region of the thermochromic structure produces a first visual indication of a first conduit status of the first conduit

Methodology Applied

Scientific EffectThermochromism: Thermochromism

Implementation Method 2

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentUS20250349577A1Conduit check apparatus

Publication Date: 2025.11.13 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

A system includes an electrostatic chuck defining a first conduit configured to emit a first gas. The system includes a conduit check apparatus for identifying a first conduit status of the first conduit. The conduit check apparatus includes a thermochromic structure including a first region positioned relative to a flow path of the first gas emitted from the first conduit. The first region of the thermochromic structure produces a first visual indication of the first conduit status.