Gas-Cell Photonic Sensor Correction for Leakage and Background Radiation
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Solution Overview
Problem
Photonic sensors used in microelectronic device fabrication are susceptible to drift due to thermal leakage current and stray or background infrared radiation, leading to inaccurate concentration measurements, particularly in high volume manufacturing environments.
Innovation Solution
A sensor apparatus with a gas cell-body, light source, photonic detector system, and temperature-controlled housing, along with temperature sensors to measure and correct for leakage current and background radiation, using calibration models to dynamically adjust intensity signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photonic sensors are used to monitor species concentration in processing chambers, then concentration measurements can be obtained, but the sensor accuracy drifts due to thermal leakage current and background radiation
Solution Approach 1:
The patent implements feedback by continuously monitoring temperature with temperature sensors and dynamically adjusting the photonic sensor's operating parameters or applying correction factors based on temperature deviations. This closed-loop approach compensates for thermal leakage current and background radiation effects, maintaining measurement accuracy despite temperature variations in the processing chamber environment.
Solution Approach 2:
The patent changes operational parameters of the photonic sensor based on temperature conditions. By adjusting parameters such as detector bias voltage, light source intensity, or signal processing characteristics in response to temperature measurements, the system compensates for thermal effects and maintains consistent concentration measurement accuracy across varying environmental conditions.
2Measurement precision
If photonic sensors operate in a narrow temperature range, then measurement accuracy is maintained, but process flexibility and adaptability are reduced
Solution Approach 1:
The temperature monitoring and feedback correction system enables the photonic sensor to operate accurately across a wider temperature range than traditionally possible. By continuously compensating for thermal effects through feedback control, the sensor maintains measurement precision while adapting to varying temperature conditions, thus expanding its operational flexibility without sacrificing accuracy.
Solution Approach 2:
The system dynamically adjusts operational parameters based on real-time temperature measurements, allowing the photonic sensor to maintain optimal performance across an expanded temperature range. This parameter adaptation enables the sensor to operate flexibly in diverse processing chamber environments while preserving measurement accuracy.
3Measurement precision
If temperature control housing is implemented around the gas cell-body, then background radiation effects are reduced, but device complexity increases
Solution Approach 1:
The patent introduces temperature sensors as intermediary elements that monitor thermal conditions and provide data for correction calculations. Rather than physically isolating the photonic sensor from temperature effects through complex thermal shielding, the system uses temperature measurement and computational correction as an intermediary approach to compensate for background radiation and thermal leakage effects.
Solution Approach 2:
The patent replaces mechanical/physical temperature control mechanisms (such as active thermal shielding or controlled environment chambers) with an electronic/software-based correction system. By using temperature sensors combined with computational models to calculate and correct for thermal effects, the system achieves radiation correction without the complexity of elaborate mechanical thermal control infrastructure.
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
Provides accurate species concentration measurements by dynamically correcting for temperature variations, enabling continuous monitoring and improving process stability and uniformity in microelectronic device fabrication.
Implementation Method 1
a light source coupled to the first end of the gas cell-body, where the light source is configured to emit electromagnetic radiation through the gas cell-body
Implementation Method 2
a photonic detector system coupled to the second end of the gas cell-body
Implementation Method 3
thermal leakage current and stray or background infrared radiation can cause the accuracy of the photonic sensor to drift
Data Source
AI summary
Embodiments disclosed herein include a sensor apparatus that includes a gas cell-body with a first end and a second end, and a light source coupled to the first end of the gas cell-body, where the light source is configured to emit electromagnetic radiation through the gas cell-body. In an embodiment, the sensor apparatus further includes a photonic detector system coupled to the second end of the gas cell-body, and a housing around the gas cell-body that is temperature controlled, where the photonic detector is outside the housing. The sensor apparatus may further include a temperature sensor configured to measure a temperature of the photonic detector system or a temperature of the gas cell-body.