Electrostatic Chuck Heating Structure for Wafer Temperature Uniformity
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Solution Overview
Problem
Existing electrostatic chuck apparatuses struggle to maintain uniform temperature distribution on wafer substrates during high-temperature processing, leading to significant temperature imbalances that affect semiconductor manufacturing precision.
Innovation Solution
The apparatus incorporates a base with cooling flow paths, an adiabatic layer, a uniform heating plate, an insulating layer, a conductive layer, and a dielectric layer, each with specific materials and configurations to ensure even heat transfer and minimize thermal expansion, thereby reducing temperature imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating element is used to heat the wafer substrate to high temperature, then the driving energy for etching is increased, but temperature imbalance on the wafer substrate occurs
Solution Approach 1:
The heating system is segmented into multiple independent heating zones (first heating zone and second heating zone) with separate heating elements, allowing independent temperature control of different regions to achieve uniform overall heating
Solution Approach 2:
Different heating elements are applied to different regions of the wafer substrate based on local heating requirements, with the first heating element for the first heating zone and the second heating element for the second heating zone, enabling localized temperature optimization
2Temperature
If a cooling flow path is added to the base, then temperature control capability is improved, but device complexity increases
Solution Approach 1:
The cooling flow path is merged with the base structure, integrating the cooling function directly into the existing support structure rather than adding a separate cooling system, thereby controlling temperature without significantly increasing complexity
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 solution effectively reduces temperature imbalances on wafer substrates to within ±3°C, enhancing the precision and reliability of semiconductor processing by maintaining consistent heating across the substrate.
Implementation Method 1
a base including a cooling flow path, the cooling flow path configured to have a refrigerant flow therethrough
Implementation Method 2
an adiabatic layer on the base
Implementation Method 3
a uniform heating plate on the adiabatic layer and configured to uniformly transfer heat from the adiabatic layer to an upper portion of the uniform heating plate
Implementation Method 4
an insulating layer on the uniform heating plate and including a ceramic; a conductive layer on the insulating layer; and a dielectric layer on the conductive layer and including a ceramic
Data Source
AI summary
An electrostatic chuck apparatus is provided that is capable of effectively reducing temperature imbalance of a wafer substrate that is heated to a high temperature. The electrostatic chuck apparatus includes a base including a cooling flow path through which a refrigerant may flow, an adiabatic layer on the base, a uniform heating plate on the adiabatic layer, a heating element between the adiabatic layer and the uniform heating plate, an insulating layer on the uniform heating plate and including a ceramic, a conductive layer on the insulating layer and having an area smaller than an area of the insulating layer, and a dielectric layer on the conductive layer and including a ceramic.