Electrostatic Chuck Temperature Sensor Insulation Design
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Solution Overview
Problem
Conventional electrostatic chucks face challenges in accurately detecting the surface temperature due to the temperature sensor being affected by the heating element, leading to inaccurate temperature control.
Innovation Solution
The design includes a substrate with a first and second hole aligned in the thickness direction, where the second hole is closer to the heating part and larger, housing a metal material to diffuse heat away from the temperature sensor, and an air layer between the sensor and the metal material for improved heat insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor is placed close to the heating element for efficient temperature monitoring, then the temperature control response is improved, but the temperature sensor is affected by heat interference from the heating element leading to inaccurate detection
Solution Approach 1:
The patent introduces an insulating structure as an intermediary between the heating element and the temperature sensor. This insulating structure acts as a thermal barrier that blocks heat interference from the heating element while allowing the temperature sensor to accurately detect the substrate temperature without being affected by the heating element's thermal radiation or conduction.
Solution Approach 2:
The patent segments the temperature detection function from the heating function by providing separate structural zones - one for the heating element and another for the temperature sensor, connected through an insulating structure. This segmentation allows each component to perform its function independently without mutual interference, enabling accurate temperature monitoring while maintaining effective heating.
2Measurement precision
If the temperature sensor is positioned away from the heating element to avoid heat interference, then measurement accuracy is improved, but the temperature control response time and effectiveness are reduced
Solution Approach 1:
The insulating structure serves as a thermal mediator that selectively blocks harmful heat interference from the heating element while maintaining thermal coupling between the substrate and the temperature sensor. This allows the temperature sensor to detect substrate temperature accurately and rapidly without being contaminated by the heating element's thermal field, thus achieving both fast response time and high measurement precision.
Solution Approach 2:
The patent applies local quality by creating a localized insulating environment around the temperature sensor or between the heating element and sensor, while maintaining good thermal contact between the substrate and the temperature sensor. This localized insulation strategy ensures that the temperature sensor accurately reflects the substrate temperature with minimal response time delay, without being affected by the heating element's thermal interference.
3Device complexity
If a simple temperature sensing structure is used, then device complexity is reduced, but the ability to shield the sensor from heat interference is insufficient
Solution Approach 1:
The patent introduces an insulating structure as a simple yet effective intermediary component between the heating element and the temperature sensor. This insulating structure can be implemented as a straightforward thermal barrier material or layer, providing adequate heat shielding without requiring complex mechanisms or multiple components, thus maintaining device simplicity while effectively blocking heat interference.
Solution Approach 2:
The insulating structure is designed to provide beforehand cushioning against heat interference by being positioned in advance between the heating element and the temperature sensor. This proactive thermal insulation approach prevents heat interference from reaching the temperature sensor, eliminating the need for complex active compensation or shielding mechanisms while maintaining measurement accuracy.
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
This configuration enhances the accuracy of surface temperature detection and reduces the likelihood of heat interference from the heating element, allowing for precise temperature control and increased heatproof temperature capabilities.
Implementation Method 1
housing a metal material to diffuse heat away from the temperature sensor
Implementation Method 2
an air layer between the sensor and the metal material for improved heat insulation
Implementation Method 3
a substrate fixing device that attracts and holds a wafer using an electrostatic chuck
Data Source
AI summary
An electrostatic chuck includes a heating part, a substrate on the heating part, a temperature sensor, and a metal material. The substrate includes a first surface onto which an object is to be attracted and held, a second surface opposite from the first surface and contacting the heating part, and a first hole and a second hole aligned in a thickness direction of the substrate in communication with each other. The second hole is closer to the heating part than is the first hole, and open at the second surface of the substrate. The second hole is larger than the first hole when viewed in the thickness direction of the substrate. The temperature sensor is at the bottom of the first hole. The metal material is in the second hole with a space between the temperature sensor and the metal material.