Zone-Assigned Thermocouples for Precise Semiconductor Temperature Control
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Solution Overview
Problem
Current temperature control systems in semiconductor manufacturing struggle with precise temperature control in the process space where substrates are placed, as they rely on a single temperature sensor that may not accurately represent the temperature of the substrate or the process chamber.
Innovation Solution
A system with multiple temperature sensors, including a substrate thermocouple for direct substrate measurement, an internal thermocouple for process space measurement, and a heater thermocouple for heater control, along with a controller that can selectively use these sensors for each zone, allowing for improved temperature control by assigning the most accurate sensor to each zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single temperature sensor is used to control the process chamber temperature, then the device complexity is reduced, but the temperature measurement precision and control accuracy deteriorate
Solution Approach 1:
The process chamber is divided into multiple zones (first zone and second zone), with separate temperature sensors assigned to each zone. This segmentation allows independent temperature monitoring and control for each zone, improving overall temperature measurement precision without requiring a completely complex system architecture.
Solution Approach 2:
Different temperature sensors are placed at different locations within the process chamber to measure local temperatures accurately. The first temperature sensor measures temperature in the first zone while the second temperature sensor measures temperature in the second zone, ensuring that each region's temperature is precisely monitored according to its specific thermal characteristics.
2Measurement precision
If multiple temperature sensors are deployed in different zones, then the temperature measurement precision improves, but the device complexity increases
Solution Approach 1:
The controller is designed to universally handle multiple temperature sensors and perform multiple functions: it can select which sensor to use, determine zone temperatures based on sensor readings, and control heating elements accordingly. This multi-functionality manages the complexity of having multiple sensors through a unified control architecture.
Solution Approach 2:
The system dynamically selects which temperature sensor to use for control based on real-time conditions. The controller can switch between the first and second temperature sensors depending on which zone requires temperature control, making the system adaptable and efficient rather than statically configured.
3Device complexity
If the temperature sensor is placed away from the substrate, then the device complexity is reduced, but the temperature detection accuracy of the substrate environment deteriorates
Solution Approach 1:
Temperature sensors are placed in specific zones where they can most effectively measure the local temperature environment. The first temperature sensor is positioned to accurately measure substrate temperature in the first zone, while the second temperature sensor measures the temperature of the process chamber wall or other components in the second zone, ensuring each sensor captures the most relevant local thermal data.
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 enhances temperature controllability and precision in the process space, ensuring accurate temperature maintenance for semiconductor manufacturing processes.
Implementation Method 1
a substrate thermocouple for direct substrate measurement
Implementation Method 2
an internal thermocouple for process space measurement
Implementation Method 3
a heater thermocouple for heater control
Implementation Method 4
a heater arranged in each of a plurality of zones
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
There is provided a technique that includes: a heater (40) arranged in each of a plurality of zones (U, CU, C, CL, L); at least one first temperature sensor (211) configured to be capable of operating in conjunction with at least one substrate (1); another temperature sensor aside from the at least one first temperature sensor (211); and a controller (200) configured to be capable of controlling the heater (40) based on a temperature detected by either the at least one first temperature sensor (211) or the another temperature sensor, wherein the either the at least one first temperature sensor (211) or the another temperature sensor is assigned to each of the plurality of zones (U, CU, C, CL, L).