Heater Zone Calibration for Uniform Thermal Response Sensing
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Solution Overview
Problem
Heater systems in semiconductor processing face challenges in maintaining a precise temperature profile due to manufacturing variations and environmental changes, leading to inconsistent heat distribution across heating zones.
Innovation Solution
A method is developed to determine variations in heating zones based on temperature decay rate and resistance characteristics, with a calibration procedure that adjusts power application to compensate for these variations using infrared or video cameras to record thermal information and generate lookup tables for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heater assembly is used to provide heat to a substrate, then the substrate temperature can be maintained, but manufacturing variations and environmental changes cause non-uniform temperature distribution across different heating zones
Solution Approach 1:
The heater assembly is divided into multiple independently controllable heating zones, each with its own power adjustment capability. This segmentation allows individual zone calibration to compensate for manufacturing variations and environmental factors, achieving uniform temperature distribution across the entire heating surface.
Solution Approach 2:
The system dynamically adjusts the power level applied to each heating zone based on measured temperature decay rates and resistance characteristics. By changing the power parameter for each zone individually, the system compensates for variations in thermal response and achieves uniform temperature distribution despite manufacturing tolerances.
2Temperature
If calibration procedures are implemented to compensate for heater variations, then temperature uniformity improves, but the system complexity and measurement requirements increase
Solution Approach 1:
The heater assembly performs self-calibration by using its own heating elements and inherent thermal properties to generate calibration data. The system measures temperature decay rates and resistance characteristics during normal operation, eliminating the need for external calibration equipment and reducing overall system complexity.
Solution Approach 2:
The system implements a feedback mechanism where temperature measurements from each heating zone are used to adjust power distribution. By continuously monitoring temperature decay rates and resistance characteristics, the system automatically compensates for variations and maintains uniform temperature profiles without requiring complex external control systems.
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 approach ensures a uniform temperature profile by identifying and adjusting heating zones with varying responses, enhancing the heater's ability to maintain consistent temperature despite manufacturing deviations and environmental changes.
Implementation Method 1
A heater 20 is secured to the heater plate 16... A radio frequency (RF) or microwave power source (not shown) may be coupled to the electrostatic chuck 12... The heater 20 thus provides requisite heat to maintain temperature on the substrate 26
Implementation Method 2
using infrared or video cameras to record thermal information
Data Source
AI summary
Disclosed is a method for controlling a heater assembly by detecting variations in multiple heating zones based on temperature decay rates or resistance characteristics of each zone. A calibration procedure is executed to mitigate the identified variations in the heating zones, ensuring uniform heating performance across the heater assembly.