Bipolar Electrostatic Chuck Electrode Layout for Wafer Temperature Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional substrate support systems in semiconductor manufacturing face challenges with temperature non-uniformity, leading to film thickness issues due to uneven current flow and resistive heating, which can cause hotspots and plasma-related problems like arcing and substrate discoloration.
Innovation Solution
The substrate support assemblies incorporate a configuration of bipolar electrodes with a spoked connector and RF-powered electrodes, ensuring uniform current distribution and reducing resistive heating, while maintaining bipolar chucking capabilities and supporting RF modulation to enhance temperature uniformity and plasma deposition across the wafer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional substrate support systems are used, then substrate processing can be performed, but temperature non-uniformity occurs leading to film thickness issues
Solution Approach 1:
The substrate support system divides the electrode structure into multiple bipolar electrodes arranged in a segmented pattern across the substrate surface. This segmentation allows independent control of different regions, enabling compensation for temperature variations and achieving more uniform heating across the entire substrate, thereby improving both temperature uniformity and film thickness consistency
Solution Approach 2:
The bipolar electrode configuration provides different electrical properties at different locations on the substrate support. By varying the electrode arrangement and connectivity patterns in different regions, the system can deliver localized heating control to address specific temperature non-uniformity issues in different areas of the substrate
2Productivity
If higher temperatures are used to increase deposition rates, then productivity improves, but temperature non-uniformity worsens causing film thickness issues
Solution Approach 1:
The bipolar electrode system enables dynamic control of heating patterns by adjusting the electrical connectivity and polarity of different electrode segments in real-time. This dynamic capability allows the system to optimize temperature distribution during high-rate deposition processes, maintaining uniformity even at elevated temperatures that increase productivity
3Device complexity
If conventional electrode configurations are used, then device complexity is low, but hotspots and plasma-related problems occur
Solution Approach 1:
The bipolar electrode arrangement creates equipotential regions across the substrate support surface by strategically configuring the electrode connections. This equipotential design distributes electrical field intensity more uniformly, preventing concentration of current that would otherwise create hotspots and reduce plasma-related issues such as arcing
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 improves temperature uniformity across the substrate, reduces hotspots, and minimizes plasma-related issues such as arcing and substrate discoloration, resulting in more consistent film deposition and improved semiconductor processing outcomes.
Implementation Method 1
maintaining bipolar chucking capabilities
Implementation Method 2
supporting RF modulation to enhance temperature uniformity and plasma deposition across the wafer
Data Source
AI summary
Exemplary substrate support assemblies may include an electrostatic chuck body defining a substrate support surface that defines a substrate seat. The assemblies may include a support stem coupled with the electrostatic chuck body. The assemblies may include a first bipolar electrode embedded within the electrostatic chuck body. The assemblies may include a second bipolar electrode embedded within the electrostatic chuck body. An entirety of the second bipolar electrode may be radially inward of at least a portion of the first bipolar electrode. The first bipolar electrode and the second bipolar electrode may be coaxial with one another. Each of the first bipolar electrode and the second bipolar electrode may be coupled with at least one RF power supply. Each of the first bipolar electrode and the second bipolar electrode may be coupled with at least one DC power supply.