Semiconductor Substrate Inspection via Thermal Light Frequency Analysis
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Solution Overview
Problem
Semiconductor substrates often experience misalignment, inclination, and warpage during processing due to improper fixation or movement relative to the substrate holder, leading to unintended processing and temperature gradients, which can result in damage.
Innovation Solution
A method of inspecting a rotating semiconductor substrate in real-time by measuring light intensity and analyzing its frequency distribution to determine the substrate's state without using an additional light source, allowing for continuous processing adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional light sources are used for inspection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The thermal light source originally designed for heating the semiconductor substrate during processing is made to serve dual purposes: both thermal processing and optical inspection. By detecting light reflected from the substrate using this existing thermal source, the system eliminates the need for separate inspection light sources, thereby reducing device complexity while maintaining inspection functionality
Solution Approach 2:
The thermal light source serves itself by providing both its primary heating function and an additional inspection function. The system uses the reflected light from the substrate illuminated by the thermal source to detect substrate state, allowing the thermal source to contribute to both processing and monitoring without requiring external dedicated inspection equipment
2Reliability
If real-time inspection is implemented, then reliability is improved, but use of energy increases
Solution Approach 1:
The thermal light source performs dual functions of heating and illumination for inspection simultaneously. By making the thermal source multi-functional, the system avoids adding separate energy-consuming inspection equipment, thereby achieving real-time monitoring capability without proportionally increasing energy consumption
Solution Approach 2:
The inspection function is merged with the thermal processing function by using the same thermal light source for both purposes. This consolidation eliminates the need for separate energy sources for inspection, reducing overall energy consumption while enabling continuous real-time monitoring of substrate state
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
Enables real-time monitoring and adjustment of semiconductor substrate alignment and warpage, preventing damage and ensuring reliable processing by using existing thermal light sources for inspection, thereby enhancing processing reliability and substrate integrity.
Implementation Method 1
measuring light intensity of light reflected on the semiconductor substrate
Implementation Method 2
analyzing a frequency distribution of the measured light intensity... extracting a plurality of frequency components corresponding respectively to a plurality of frequencies from the measured light intensity
Data Source
AI summary
A method of inspecting a semiconductor substrate includes measuring light intensity of light reflected on the rotating semiconductor substrate, analyzing a frequency distribution of the measured light intensity, and determining a state of the semiconductor substrate by using the frequency distribution. The analyzing of the frequency distribution of the measured light intensity includes extracting a plurality of frequency components corresponding respectively to a plurality of frequencies from the measured light intensity.