Electrostatic Chuck Sub-Electrode Warpage Compensation
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Solution Overview
Problem
Existing electrostatic chuck assemblies struggle to uniformly fix wafers during semiconductor manufacturing due to warpage, which can lead to uneven electrostatic force distribution and plasma processing inconsistencies.
Innovation Solution
An electrostatic chuck assembly with a circular-shaped electrostatic dielectric layer and a plurality of sub-adsorption electrodes separated in the X and Y directions, along with a control system that adjusts electrostatic voltages to compensate for wafer warpage, ensuring uniform adsorption and processing. Additionally, a gas channel is integrated to control wafer temperature through thermally conductive gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional electrostatic chuck with a single adsorption electrode is used, then the structure is simple, but uniform adsorption of the wafer cannot be achieved due to warpage
Solution Approach 1:
The single adsorption electrode is divided into multiple sub-adsorption electrodes (first, second, third, and fourth sub-adsorption electrodes) arranged in a specific pattern. Each sub-electrode can be independently controlled to compensate for wafer warpage, enabling uniform adsorption across the entire wafer surface despite the increased structural complexity.
2Force
If electrostatic force is increased to improve wafer fixation, then adsorption strength increases, but non-uniform distribution due to warpage causes processing inconsistencies
Solution Approach 1:
Different voltages are applied to different sub-adsorption electrodes based on the local warpage characteristics of the wafer. The control unit adjusts the voltage distribution across the four sub-electrodes to compensate for non-uniform warpage, ensuring that the electrostatic force is uniformly distributed across the wafer surface, thereby maintaining plasma processing consistency.
3Temperature
If wafer temperature is not controlled, then the structure remains simple, but thermal effects cause additional warpage and processing variations
Solution Approach 1:
The electrostatic chuck structure is designed to perform multiple functions: the base serves both as the mounting structure for the electrostatic dielectric layer and as a temperature control component with integrated gas channels. This multi-functionality allows temperature control without significantly increasing overall structural 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 enables uniform wafer adsorption and plasma processing by adjusting electrostatic forces and temperature, effectively addressing warpage issues and improving processing consistency and efficiency.
Implementation Method 1
The wafer is fixed using an electrostatic chuck via electrostatic force
Implementation Method 2
A gas channel is connected to the at least one recess portion to provide a thermally conductive gas through the electrostatic chuck to control a temperature of the wafer
Data Source
AI summary
An electrostatic chuck assembly includes an electrostatic chuck including a circular-shaped electrostatic dielectric layer on which a wafer is mounted and an adsorption electrode in the electrostatic dielectric layer, and a control part configured to control the electrostatic chuck, wherein the adsorption electrode comprises a plurality of sub-adsorption electrodes separated from each other in an X direction and a Y direction perpendicular to the X direction on a plane level from a central portion of the electrostatic dielectric layer.