Instrumented Wafer Sensing for Semiconductor Tool Condition Inspection

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Solution Overview

Problem

Existing semiconductor equipment calibration and inspection methods are inefficient and lack comprehensive evaluation of tool conditions, particularly in assessing components like showerheads and chamber internals.

Innovation Solution

A sensor-equipped wafer with optical, ambient atmospheric, and sound sensors, capable of being transported within a semiconductor processing tool, provides detailed evaluations of tool conditions by capturing images and measuring environmental parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If wafers are instrumented with accelerometers and downward-facing cameras for calibration and inspection, then wafer movement characterization and wafer centering operations are assisted, but the evaluation of tool conditions and components like showerheads and chamber internals remains insufficient

Engineering Contradiction:

Improvewafer movement characterization precisionVSAvoidcomprehensive evaluation capability

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The wafer is designed with multiple types of sensors (accelerometers, downward-facing cameras, upward-facing cameras, ambient atmospheric sensors, and sound sensors) that enable it to perform multiple functions: characterizing wafer movement, centering operations, evaluating tool conditions, monitoring showerheads, and inspecting chamber internals. This multi-functional sensor array resolves the contradiction by providing both precise wafer movement characterization and comprehensive tool condition evaluation through a single integrated system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If comprehensive sensor arrays are deployed on wafers to evaluate tool conditions, then monitoring precision for wear and contamination is improved, but device complexity increases

Engineering Contradiction:

Improvetool condition monitoring precisionVSAvoidsensor device complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Multiple sensor types (accelerometers, cameras, atmospheric sensors, sound sensors) are merged into a single integrated wafer device. This consolidation allows comprehensive tool condition monitoring with high precision while managing complexity by combining sensors that would otherwise require separate systems. The wafer itself serves as the platform for all sensors, eliminating the need for multiple separate measurement devices.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The wafer serves as both the processed material and the measurement platform. By instrumenting the wafer itself with sensors, the system uses the wafer to monitor its own processing conditions and tool state, eliminating the need for separate complex monitoring systems. The wafer's own movement and position data are used for calibration, and its sensor readings provide tool condition evaluation.

Inventive Principle:

Principle #25Self-service

3Loss of information

If upward-facing optical sensors are added to monitor showerheads and chamber internals, then comprehensive data on tool conditions is provided, but processing time and energy consumption increase

Engineering Contradiction:

Improvetool condition information completenessVSAvoidprocessing time

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

The upward-facing optical sensors continuously capture images of showerheads and chamber internals during wafer processing operations. This continuous monitoring provides complete tool condition information without requiring separate inspection steps, as the sensing occurs concurrently with normal processing. The system captures images at appropriate intervals during wafer transport and processing, ensuring comprehensive data collection while maintaining processing continuity.

Inventive Principle:

Principle #20Continuity of useful action

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 precise monitoring of tool components for wear and contamination, facilitating timely maintenance and improving processing efficiency by providing comprehensive data on tool conditions.

Implementation Method 1

one or more optical sensors, each optical sensor oriented so as to have an upward-facing field of view

Methodology Applied

Scientific EffectLight detection: Light

Data Source

PatentUS20260005054A1Mobile sensor devices for semiconductor fabrication equipment

Publication Date: 2026.01.01 LAM RES CORP

AI summary

Systems and techniques for obtaining various types of sensor information regarding operational aspects of a semiconductor processing tool are disclosed. Such systems and techniques may involve an instrumented wafer that includes one or more different types of sensors, including, for example, pressure sensors, oxygen (or other gas) sensors, humidity sensors, upward- and/or outward-facing imaging sensors or optical sensors, microphone sensors, and so forth.