Electrostatic Chuck Metal Layer for Temperature Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Variations in the thickness of the heating element in substrate fixing devices can impair the uniformity of the surface temperature of the electrostatic chuck, affecting the uniform heating of wafers in vacuum processes.
Innovation Solution
Incorporating a metal layer with higher thermal conductivity than the insulating layer, positioned closer to the electrostatic chuck than the heating element, to diffuse and uniformize heat generation, thereby improving temperature uniformity across the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating element is buried in an insulating layer, then the electrostatic chuck can be heated, but variations in heating element thickness cause non-uniform heat generation and impair temperature uniformity
Solution Approach 1:
A metal layer with high thermal conductivity is introduced as an intermediary between the heating element and the electrostatic chuck. This metal layer acts as a heat diffusion medium that receives heat from the heating element and redistributes it uniformly across the chuck surface, mediating the thermal transfer process to eliminate temperature non-uniformity caused by heating element thickness variations
Solution Approach 2:
The thermal conductivity parameter is strategically modified by introducing a metal layer with significantly higher thermal conductivity than the insulating layer. This parameter change enables efficient heat diffusion and uniformization, transforming the thermal field distribution from non-uniform to uniform across the electrostatic chuck surface
2Use of energy by moving object
If the heating element is positioned closer to the electrostatic chuck, then heating efficiency improves, but heat distribution uniformity deteriorates
Solution Approach 1:
The metal layer serves as a thermal intermediary that decouples the positioning relationship between the heating element and the electrostatic chuck. By placing the metal layer closer to the chuck, heating efficiency is maintained while the metal layer's high thermal conductivity ensures uniform heat distribution across the chuck surface, resolving the trade-off between efficiency and uniformity
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 metal layer effectively reduces non-uniform heat generation, enhancing the uniformity of the surface temperature of the electrostatic chuck, which is crucial for consistent wafer heating and processing in semiconductor manufacturing.
Implementation Method 1
The metal layer has a higher thermal conductivity than the insulating layer and is positioned closer to the electrostatic chuck than the heating element
Implementation Method 2
a substrate fixing device that attracts and holds a wafer that is an object of attraction using an electrostatic chuck
Data Source
AI summary
A substrate fixing device includes a baseplate, an insulating layer over the baseplate, and an electrostatic chuck on the insulating layer. The insulating layer includes a heating element and a metal layer. The metal layer has a higher thermal conductivity than the insulating layer and is positioned closer to the electrostatic chuck than the heating element.