Optical Emission Spectroscopy Plasma Monitoring
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Solution Overview
Problem
Current plasma measurement techniques, such as Langmuir probes, face challenges in real-time monitoring and are prone to contamination, making it difficult to accurately analyze plasma uniformity and detect abnormalities in plasma treatment processes for semiconductor and flat panel display manufacturing.
Innovation Solution
An optical emission spectroscopy apparatus with a light measuring unit, analyzing unit, control unit, and light collecting controller is used to measure and analyze plasma states in a process chamber, allowing for precise control of light collection and analysis of plasma uniformity without direct contact, enabling real-time monitoring and detection of plasma abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Langmuir probes are used for plasma measurement, then real-time monitoring capability is provided, but contamination occurs and measurement accuracy deteriorates
Solution Approach 1:
The patent introduces an optical intermediary system consisting of a window, light collecting controller, and spectroscopy apparatus that mediates between the plasma and measurement device. This allows real-time plasma monitoring through optical signals without direct physical contact, eliminating contamination issues while maintaining measurement accuracy
Solution Approach 2:
The patent replaces the mechanical Langmuir probe system with an optical measurement system. By substituting direct mechanical contact with optical field interaction, the system achieves real-time monitoring without the contamination and reliability problems associated with physical probe insertion into plasma
2Measurement precision
If light collecting controller is added to control incident range, then plasma uniformity analysis capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the light collection process by introducing a light collecting controller with adjustable aperture that can selectively collect light from different spatial regions. This segmentation enables localized plasma uniformity analysis while keeping the overall system relatively simple through modular design
Solution Approach 2:
The patent incorporates an adjustable aperture in the light collecting controller that can dynamically change the incident light range. This dynamic adjustment capability allows flexible plasma uniformity analysis at different locations without requiring multiple fixed sensors, thereby improving measurement precision while limiting complexity increase
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 solution allows for accurate analysis of plasma states and uniformity, reducing scrap and disuse of wafers, contributing to cost reduction and improved production efficiency while maintaining conventional end-point detection settings.
Implementation Method 1
an apparatus for optical emission spectroscopy which measures light in a process chamber to analyze a plasma state in the process chamber
Data Source
AI summary
Disclosed is an apparatus for optical emission spectroscopy which includes a light measuring unit measuring light in a process chamber performing a plasma process on a substrate, a light analyzing unit receiving light collected from the light measuring unit to analyze a plasma state, a control unit receiving an output signal of the light analyzing unit to process the output signal, and a light collecting controller disposed between the process chamber and the light measuring unit so as to be combined with the light measuring unit. The light collecting controller controls the light collected to the light measuring unit.