Decomposition Detection Unit for Semiconductor Material Gas
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Solution Overview
Problem
In semiconductor manufacturing, the decomposition of vaporized semiconductor materials can lead to errors in concentration measurement and control, as existing systems cannot distinguish between changes in material gas concentration and material decomposition, affecting device performance and quality.
Innovation Solution
A decomposition detecting unit using NDIR or laser absorption spectroscopy to measure absorbance at specific wavelengths, allowing for the detection of semiconductor material decomposition by comparing first and second absorbance ratios or differences, enabling accurate differentiation between concentration changes and decomposition events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single wavelength absorbance measurement is used to monitor material gas concentration, then the concentration control is simple, but decomposition cannot be detected when material gas self-decomposes
Solution Approach 1:
The measurement is segmented into multiple wavelength channels: a first wavelength for monitoring material gas concentration and a second wavelength for detecting decomposition products. This segmentation allows the system to distinguish between concentration changes and decomposition events by comparing absorbance ratios across different wavelengths
Solution Approach 2:
The system changes the measurement parameter from single-wavelength absorbance to multi-wavelength absorbance ratio. By monitoring the ratio of absorbance at different wavelengths, the system can detect decomposition because decomposition products have different absorption characteristics than the original material gas
2Ease of operation
If concentration measurement is performed using a single absorbance value, then the measurement is straightforward, but errors occur when decomposition products absorb light at the same wavelength
Solution Approach 1:
The measurement transitions from one-dimensional (single absorbance value) to two-dimensional (absorbance ratio across multiple wavelengths). By adding the wavelength dimension, the system can differentiate between material gas and decomposition products even when they absorb at overlapping wavelengths, eliminating measurement errors
3Productivity
If material gas with easy vaporization is used, then the vaporization efficiency is high, but decomposition occurs more easily in the lead-out pipe
Solution Approach 1:
The absorbance ratio measurement acts as an intermediary detection mechanism that monitors the chemical integrity of the material gas. By continuously comparing the absorbance ratio against a reference value, the system can detect decomposition events and trigger alerts or corrective actions before defective material reaches the vacuum chamber
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 precise detection of semiconductor material decomposition, ensuring accurate concentration control and maintaining device performance by distinguishing between concentration changes and decomposition, even in the presence of self-decomposing materials like organic metals, without requiring large, expensive instruments.
Implementation Method 1
an NDIR type or laser absorption spectroscopy type absorbance measuring mechanism that measures first absorbance, which is absorbance at a wavelength at which a semiconductor material absorbs light, and second absorbance, which is absorbance at a wavelength at which a material produced when the semiconductor material decomposes absorbs light
Data Source
AI summary
Provided is a decomposition detecting unit that despite a simple configuration, can detect whether or not decomposition occurs in material gas resulting from the vaporization of a semiconductor material. The decomposition detecting unit includes: an NDIR type or laser absorption spectroscopy type absorbance measuring mechanism that measures first absorbance, which is absorbance at a wavelength at which a semiconductor material absorbs light, and second absorbance, which is absorbance at a wavelength at which a material produced when the semiconductor material decomposes absorbs light, of mixed gas containing material gas resulting from the vaporization of the semiconductor material; and a decomposition detection part that detects the decomposition in the material gas on the basis of the ratio between first concentration calculated on the basis of the first absorbance and the second absorbance and second concentration calculated on the basis of the second absorbance.