ICP Exhaust Reactor Impedance Matching With Stepwise Capacitance Control
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Solution Overview
Problem
Existing impedance matching methods for inductively coupled plasma reactors in semiconductor manufacturing facilities are either expensive (fully automatic) or inconvenient (manual), leading to issues like plasma off, reduced power supply, inefficient power usage, and equipment damage.
Innovation Solution
An inductively coupled plasma apparatus with an impedance matching unit that includes a variable power storage element, an operation data measuring instrument, and a controller, which adjusts total capacitance stepwise based on operation data sampling to match impedance between the reactor and power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fully automatic impedance matching method is used, then impedance matching precision is improved, but device cost increases
Solution Approach 1:
The system automatically measures impedance using the operation data measuring instrument and adjusts the variable power storage element through the controller without external intervention, enabling self-service impedance matching that reduces device cost while maintaining precision
Solution Approach 2:
The operation data measuring instrument continuously monitors impedance and feeds this information to the controller, which adjusts the variable power storage element accordingly, creating a closed-loop feedback system that achieves precise impedance matching at lower cost
2Device complexity
If a manual impedance matching method is used, then device cost is reduced, but ease of operation deteriorates
Solution Approach 1:
The system performs automatic impedance measurement and adjustment without requiring manual intervention, eliminating the operational inconvenience of manual methods while keeping device cost low through the use of simple measuring instruments and controllers
Solution Approach 2:
The variable power storage element is dynamically adjusted by the controller based on real-time impedance measurements, enabling the system to adapt automatically to changing conditions without manual intervention, thus improving ease of operation
3Device complexity
If impedance is not matched, then power supply cost is reduced, but reliability deteriorates due to plasma off, reduced power supply, damage of power supply, inefficient power usage, and rising pressure
Solution Approach 1:
The operation data measuring instrument continuously monitors system parameters and feeds this information to the controller, which adjusts the variable power storage element to maintain proper impedance matching, preventing reliability issues while optimizing power usage efficiency
Solution Approach 2:
The system replaces complex mechanical impedance matching mechanisms with electronic control using the variable power storage element and controller, achieving reliable impedance matching with simpler, more cost-effective electronic components
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 provides convenient and cost-effective impedance matching, maintaining optimal capacitance and preventing issues like plasma off and power supply damage, while improving power efficiency.
Implementation Method 1
Inductively coupled plasma is generated by an electric field generated by a time-varying current flowing through an antenna coil by applying radio frequency power to the antenna coil
Implementation Method 2
the impedance matching unit includes a variable power storage element, an operation data measuring instrument measuring operation data of the inductively coupled plasma reactor, and a controller stepwise adjusting total capacitance by the variable power storage element
Data Source
AI summary
An inductively coupled plasma apparatus for exhaust gas treatment, includes: an inductively coupled plasma reactor installed on an exhaust pipe through which exhaust gas generated from a process chamber of a semiconductor manufacturing facility is discharged; a power supply configured to supply high-frequency power to the inductively coupled plasma reactor through a transmission line; and an impedance matching unit configured to match impedance of the inductively coupled plasma reactor with impedance of the power supply, wherein the impedance matching unit includes a variable power storage element, an operation data measuring instrument measuring operation data of the inductively coupled plasma reactor, and a controller stepwise adjusting total capacitance by the variable power storage element using an operation data sampling value obtained by the operation data measuring instrument in one operation cycle and reflecting the adjusted total capacitance on starting impedance matching in a next operation cycle.