Dual-Sensor Thermal Control for Semiconductor Processing
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Solution Overview
Problem
Conventional temperature adjustment methods in semiconductor manufacturing often result in large overshoots or undershoots, requiring significant time and expense to achieve stable conditions due to the need for repeated adjustments by trained operators, which hampers operating efficiency and increases costs.
Innovation Solution
A temperature adjustment method using a thermal processing system with a heating unit, a heating control section, and first and second temperature detecting units, where the first detecting unit is closer to the substrate and the second closer to the heating unit, employing PID operations and output control patterns to correct for temperature deviations, thereby reducing overshoots and undershoots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PID feedback control is used for temperature adjustment, then the temperature can be controlled to follow a target pattern, but large overshoots or undershoots occur and significant time is required to achieve stable conditions
Solution Approach 1:
The system performs preliminary action by using the second temperature detecting unit (closer to the heating unit) to detect temperature changes before they significantly affect the substrate temperature. This early detection allows the control system to take preventive action by adjusting the heating unit's output before large overshoots or undershoots occur, thereby reducing the time required to achieve stable temperature conditions.
Solution Approach 2:
The second temperature detecting unit acts as an intermediary between the heating unit and the substrate. It provides advance information about temperature changes in the heating zone, allowing the control system to respond proactively. This intermediary measurement enables the system to anticipate and correct temperature deviations before they propagate to the substrate, improving both stability and response time.
2Manufacturing precision
If repeated adjustments by trained operators are made to reduce temperature error, then manufacturing precision can be improved, but operating efficiency decreases and costs increase
Solution Approach 1:
The system implements self-service by using the dual temperature detecting units to automatically monitor and adjust temperature without requiring repeated manual interventions. The second detecting unit provides continuous feedback about heating zone temperature, enabling the control system to self-correct temperature deviations. This automation maintains manufacturing precision while eliminating the need for operator adjustments, thereby improving operating efficiency and reducing costs.
3Device complexity
If a single temperature detecting unit is used, then the system is simpler, but it cannot provide advance warning of temperature changes before they affect the substrate
Solution Approach 1:
The temperature detection system is segmented into two spatially separated detecting units. The first unit monitors substrate temperature while the second unit monitors heating unit temperature. This segmentation allows the system to capture temperature information from different zones, providing early warning of temperature changes before they affect the substrate. The additional complexity is justified by the significant reduction in response time and improvement in temperature control accuracy.
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 method enables rapid stabilization of temperatures within the processing chamber, improving operating efficiency and reducing costs by minimizing the need for operator intervention and adjusting parameters.
Implementation Method 1
first and second temperature detecting units for detecting a temperature inside the processing chamber
Implementation Method 2
heating unit for heating an interior of a processing chamber for processing a substrate
Implementation Method 3
heating control section for controlling the heating unit... determining a first heat quantity in the period from the start of an increase in the temperature detected by the second temperature detecting unit
Data Source
AI summary
A temperature adjustment method is provided to improve operating efficiency and reduce costs. Control of a heating unit in a thermal processing system including a heating control section is performed based on a first output control pattern obtained by subjecting a detection temperature provided by a first temperature detecting unit to an integral operation, a differential operation, and a proportional operation under a condition of a first set of temperature-setting conditions, a second output control pattern obtained by determining a first heat quantity in a period from the start of an increase in temperature detected by a second temperature detecting unit until the temperature inside the processing chamber reaches a maximum temperature, and using a second heat quantity obtained by subtracting the part of the output provided by the proportional operation from the first heat quantity.