Multi-Zone Substrate Support Heating Element Design
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Solution Overview
Problem
Existing substrate support assemblies in semiconductor processing systems face challenges with uneven temperature distribution across the substrate surface due to single or multiple heating zones, leading to inefficiencies and increased mechanical complexity, including bulky designs and difficulty in adjusting temperatures during processing.
Innovation Solution
A substrate support assembly with a single heating element configured into multiple temperature-adjustable zones, where each section of the heating element responds independently to power input, allowing for precise control of temperature distribution across the substrate surface using adjustable power frequencies and amplitudes, and optionally incorporating a cooling medium for further temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple heating elements are used to generate multiple temperature heating zones, then the within-wafer temperature non-uniformity is improved, but the device complexity and mechanical design burden increase significantly
Solution Approach 1:
The single heating element is segmented into multiple heating zones along its length, allowing different sections to be controlled independently to create multiple temperature zones. This segmentation enables temperature uniformity improvement without requiring multiple separate heating elements and their associated power sources.
Solution Approach 2:
Multiple heating zones are merged into a single heating element structure that is connected to one power source. This combining approach maintains the temperature control benefits of multiple zones while eliminating the need for multiple power sources, cables, and controllers, thus reducing device complexity.
2Measurement precision
If multiple power sources are used to adjust heating temperature outputs, then the temperature control precision is improved, but the mechanical design burden and cable requirements increase
Solution Approach 1:
The single power source is equipped with dynamic control capabilities that allow it to adjust power distribution to different heating zones in real-time. This dynamic control enables precise temperature adjustment across multiple zones without requiring multiple static power sources, reducing mechanical complexity while maintaining control precision.
Solution Approach 2:
The single power source is designed to perform multiple functions by controlling different heating zones independently. It can provide precise temperature control for multiple zones simultaneously, replacing the need for multiple dedicated power sources and reducing cable requirements.
3Temperature
If multiple heating elements are used to compensate heat loss on outer edge portions, then the temperature uniformity is improved, but the number of power controllers and power sources increases
Solution Approach 1:
The heating element is segmented into zones with different power requirements, allowing the controller to apply tailored power levels to different sections (e.g., higher power to edge portions that lose more heat). This segmentation enables effective heat loss compensation through software control of a single multi-zone element rather than multiple independent elements.
Solution Approach 2:
The system incorporates feedback control mechanisms that monitor temperatures across different zones and dynamically adjust power distribution accordingly. This feedback enables the single power source to compensate for varying heat losses in different regions, maintaining temperature uniformity without requiring multiple power sources and their associated controllers.
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 solution provides improved heating efficiency and uniform temperature distribution across the substrate surface, reducing mechanical complexity and enabling adjustable temperature control in multiple zones with a single power source, thus enhancing processing efficiency and reducing hardware burdens.
Implementation Method 1
The heating element may include two or more heating element sections, and each heating element section may respond independently and differently to an input power of a power source connected to the heating element
Data Source
AI summary
Methods and substrate processing systems are provided for controlling substrate heating efficiency and generating a desired temperature profile on the surface of a substrate when the substrate is disposed on a substrate support surface of a substrate support assembly. The substrate support assembly is provided with minimum software control and hardware requirement and includes a heating element comprised of multiple heating elements sections. The heating element is connected to a power source for adjusting the temperature outputs of the multiple heating element sections and providing adjustable multi-heating zones and desired temperature distribution over the substrate support surface of the substrate support assembly within a process chamber.