Redundant Multi-Junction Thermocouple for Semiconductor Processing
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Solution Overview
Problem
Existing temperature control systems in semiconductor processing chambers suffer from accuracy deterioration and premature failures, leading to increased downtime and costs due to the need for repairs and replacements, as well as challenges in maintaining uniform temperature control for high-quality substrate processing.
Innovation Solution
A multi-junction thermocouple system with redundant junctions and conductors, where the first and second junctions are positioned close to each other to measure temperature accurately, and a controller monitors these junctions for failures, allowing for selective measurement and continued operation even if one junction fails, thereby reducing downtime and maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single thermocouple is used for temperature measurement, then the device complexity is low, but the reliability deteriorates due to premature failures and accuracy deterioration over time
Solution Approach 1:
The patent divides a single thermocouple into multiple independent thermocouple elements (first thermocouple element, second thermocouple element, etc.) positioned at different locations within the processing chamber. Each element independently measures temperature at its specific location, providing segmented temperature monitoring that improves reliability through redundancy while maintaining manageable system complexity.
Solution Approach 2:
The patent implements redundant thermocouple elements that serve as backup measurements before failures occur. The system continuously monitors multiple temperature readings and can compensate for or replace failed elements, cushioning against the impact of individual thermocouple failures and maintaining measurement reliability throughout the chamber's operational life.
2Measurement precision
If multiple temperature sensors are deployed throughout the chamber, then the temperature control accuracy improves, but the device complexity and cost increase significantly
Solution Approach 1:
The patent positions thermocouple elements at specific critical locations within the processing chamber (such as near the substrate, at different radial positions, or at key heating zones) rather than uniformly distributing sensors throughout the entire chamber. This local quality approach ensures accurate temperature measurement at critical points while minimizing the total number of sensors required, balancing measurement precision with device complexity.
3Reliability
If redundant thermocouple elements are implemented, then the reliability improves through continued operation after failure, but the device complexity increases due to additional components
Solution Approach 1:
The patent combines multiple thermocouple elements into a single integrated temperature sensing system that reports to one controller. The controller receives and processes signals from multiple thermocouple elements as a unified system, enabling operational continuity when individual elements fail while avoiding the complexity of managing completely separate independent temperature control systems.
Solution Approach 2:
The patent designs the thermocouple system so that each thermocouple element serves multiple functions: primary temperature measurement, backup for other elements, and contribution to overall temperature control accuracy. This multi-functionality justifies the additional components by maximizing their utility across different operational scenarios.
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 multi-junction thermocouple system enhances temperature control accuracy and reduces downtime by enabling continuous operation even when one junction fails, minimizing the need for repairs and maintaining consistent film properties during substrate processing.
Implementation Method 1
a multi-junction thermocouple comprises a first junction positioned to measure temperature at a portion of a substrate, a first wire pair extending from the first junction, a second junction positioned to measure temperature at substantially the same portion of the substrate, and a second wire pair extending from the second junction
Data Source
AI summary
Systems are provided for measuring temperature in a semiconductor processing chamber. Embodiments provide a multi-junction thermocouple comprising a first junction and a second junction positioned to measure temperature at substantially the same portion of a substrate. A controller may detect failures in the first junction, the second junction, a first wire pair extending from the first junction, or a second wire pair extending from the second junction. The controller desirably responds to a detected failure of the first junction or first wire pair by selecting the second junction and second wire pair. Conversely, the controller desirably responds to a detected failure of the second junction or second wire pair by selecting the first junction and first wire pair. Systems taught herein may permit accurate and substantially uninterrupted temperature measurement despite failure of a junction or wire pair in a thermocouple.