Substrate Processing Electrode Interlock for RF Power Cutoff
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional substrate processing apparatuses face issues with equipment damage and non-uniform thin film deposition due to temperature fluctuations and thermal expansion differences between electrodes, leading to potential short circuits and unnecessary reactions when electrode temperatures exceed predetermined ranges.
Innovation Solution
A substrate processing apparatus with an interlock method that measures and compares electrode temperatures, temperature differences, inter-electrode distances, and resistance values, generating an interlock signal to cut off RF power supply when these parameters exceed user-set ranges, thereby preventing equipment damage and ensuring uniform film deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RF power is continuously supplied to maintain processing efficiency, then productivity is improved, but equipment damage risk increases when temperature deviations occur
Solution Approach 1:
The system performs preliminary temperature monitoring and comparison against reference values before RF power is supplied. Temperature sensors continuously measure electrode temperatures, and the control unit compares these measurements against predetermined reference values to determine whether temperature deviations exist before initiating RF power supply, preventing equipment damage in advance
Solution Approach 2:
The system implements continuous feedback control by monitoring temperature during RF power supply, comparing actual temperatures against reference values, and automatically interrupting RF power supply when deviations are detected. This closed-loop feedback mechanism ensures productivity is maintained during normal operation while automatically preventing equipment damage when temperature anomalies occur
2Reliability
If temperature monitoring and interlock control systems are added to prevent equipment damage, then reliability is improved, but device complexity increases
Solution Approach 1:
The control unit automatically performs temperature monitoring, comparison against reference values, and RF power supply control without requiring external intervention. The system self-regulates by using its own temperature sensors and control logic to prevent equipment damage, eliminating the need for separate complex safety systems
Solution Approach 2:
The control unit serves multiple functions: it controls RF power supply timing, monitors temperature, compares temperatures against reference values, and interrupts power supply when deviations occur. By consolidating these functions into a single multi-functional control unit, the system achieves reliable equipment protection without proportionally increasing device complexity
3Ease of operation
If electrode temperatures are allowed to vary freely to simplify control, then ease of operation is improved, but manufacturing precision deteriorates due to thermal expansion differences
Solution Approach 1:
The system monitors temperature as a critical parameter and uses temperature information to control RF power supply. By maintaining temperatures within acceptable ranges through automated control, the system prevents excessive thermal expansion while avoiding complex manual temperature management, achieving both ease of operation and manufacturing precision
4Reliability
If RF power supply is interrupted frequently to check temperature conditions, then reliability is improved, but productivity decreases due to processing time loss
Solution Approach 1:
The system maintains continuous temperature monitoring during RF power supply without interrupting the processing workflow. Temperature measurements are taken continuously or at appropriate intervals during processing, and only RF power is interrupted when actual temperature deviations are detected, not on routine checks. This ensures safe operation while minimizing interruptions to productivity
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 solution effectively protects the apparatus from RF power-induced damage and maintains the uniformity of the thin film deposited on the substrate by automatically cutting off RF power during emergencies caused by temperature or resistance deviations.
Implementation Method 1
the temperature in the process chamber increases, and the first and second electrodes 131 and 132 thermally expand due to the increasing temperature
Implementation Method 2
applying RF power through the RF power supply 150 to generate plasma
Data Source
AI summary
Disclosed herein are a substrate processing apparatus and an interlock method thereof, which can generate an interlock signal, when the temperature of each upper or lower electrode in a process chamber exceeds a range set by a user, thereby cutting off application of RF power to the substrate processing apparatus. According to the substrate processing apparatus and the interlock method thereof, in an emergency where the temperatures of the upper and lower electrodes, a difference therebetween, an inter-electrode distance, and the resistance value of each electrode are out of the respective ranges set by the user, an interlock signal and an alarm signal can be generated to cut off the application of RF power to the substrate processing apparatus. Thus, it is possible to protect equipment by preventing the equipment from being damaged by RF power and to maintain the uniformity of a thin film deposited on a substrate.