Ceramic End Effector Thermal Expansion Control

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Solution Overview

Problem

Existing robotic end effectors in semiconductor processing systems face challenges with thermal expansion and heat transfer issues, leading to positional inaccuracies and substrate damage due to increased operating temperatures.

Innovation Solution

A ceramic robotic end effector with arcuate lips and contact pads minimizes thermal expansion and heat transfer by using a single mass of ceramic for the body and pads, reducing contact area with the substrate and incorporating a clamp system for secure mounting, thereby maintaining positional accuracy and facilitating easy replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a traditional metal end effector is used, then the robot can operate in high temperature environments, but thermal expansion causes positional inaccuracies

Engineering Contradiction:

Improveoperating temperatureVSAvoidsubstrate placement accuracy

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The patent changes the material parameter from metal to ceramic to fundamentally alter the thermal expansion characteristics. Ceramic materials have significantly lower coefficients of thermal expansion compared to metals, allowing the end effector to maintain dimensional stability and positional accuracy in high temperature environments without requiring complex compensation mechanisms.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite construction by integrating ceramic contact pads with a ceramic body, creating a unified ceramic component. This composite ceramic structure ensures uniform thermal expansion behavior across all contact surfaces, preventing differential expansion that would cause misalignment, while maintaining the low thermal expansion properties essential for precision substrate handling.

Inventive Principle:

Principle #40Composite materials

2Productivity

If the end effector operates at high temperatures, then processing capability is improved, but thermal heat transfer to the substrate causes damage

Engineering Contradiction:

Improveprocessing capabilityVSAvoidthermal contamination

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The ceramic contact pads serve as a thermal intermediary between the robot end effector and the substrate. Ceramic materials possess low thermal conductivity, which acts as a natural thermal barrier. This intermediary property allows the end effector to operate in high temperature environments while preventing excessive heat transfer to the substrate, thereby avoiding thermal damage and contamination.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the thermal conductivity parameter of the end effector material from metal to ceramic. This fundamental material parameter change reduces heat transfer capability while maintaining mechanical functionality, enabling the system to operate at high temperatures without transferring harmful amounts of heat to the substrate during handling operations.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If the end effector is made from multiple components, then manufacturing flexibility is improved, but assembly complexity increases

Engineering Contradiction:

Improvemanufacturing flexibilityVSAvoidassembly complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent merges the contact pads and the end effector body into a single integrated ceramic component. This unification eliminates the need for separate assembly steps, reduces the number of parts, and simplifies manufacturing while maintaining the functional benefits of contact pads. The integrated design leverages ceramic material properties to provide both structural support and contact functionality in one monolithic piece.

Inventive Principle:

Principle #5Merging (Combining)

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 ceramic end effector enhances substrate handling repeatability and reduces thermal contamination, maintaining positional accuracy and allowing for flexible robot motion in high-temperature environments.

Implementation Method 1

these strategies for increasing the accuracy of the robot generally do not compensate for thermal expansion for expansion and contraction experienced by the end effector (e.g., blade) robot as heat is transferred to the end effector from hot wafers and from hot surfaces within the process chambers

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 2

heat is transferred to the end effector from hot wafers and from hot surfaces within the process chambers

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Data Source

PatentUS7717481B2High temperature robot end effector

Publication Date: 2010.05.18 APPLIED MATERIALS INC

AI summary

A robotic end effector or blade suitable for transferring a substrate in a processing system is provided. In some embodiments, an end effector can include a body having opposing mounting and distal end, the body fabricated from a single mass of ceramic. The body can include a pair of arcuate lips extending upward from an upper surface of the body. Each lip is disposed on a respective finger disposed at the distal end of the body. An arcuate inner wall extends upward from the upper surface at the mounting end of the body. The inner wall and lips define a substrate receiving pocket. A plurality of contact pads extend upward from the upper surface of the body for supporting the substrate thereon. A recess is formed in a bottom surface of the body to accommodate a mounting clamp.