Cobalt Halogen Gas Sensor for Semiconductor Yield Protection
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Solution Overview
Problem
Existing methods fail to detect halogen gases at low concentrations and in a timely manner in high-purity environments like semiconductor fabrication clean rooms, leading to yield loss due to corrosion on metal devices.
Innovation Solution
Halogen gas sensors utilizing a cobalt or cobalt alloy layer that forms a non-volatile compound upon contact with halogen gases, enabling detection through changes in electrical, optical, or mass properties, with a minimum detectable concentration as low as 0.002 ppm and rapid response within 2 hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional metal-based sensors are used, then detection capability is limited, but sensitivity and response time are insufficient for low-level halogen gas detection
Solution Approach 1:
The patent changes the material parameter of the sensor from conventional metals to cobalt-based compounds, which fundamentally alters the detection characteristics. This material substitution enables the sensor to detect halogen gases at concentrations as low as 0.002 ppm with response times of 2 hours or less, simultaneously improving both sensitivity and response time without the trade-off present in conventional sensors
Solution Approach 2:
The sensor employs composite material structures including cobalt layers, cobalt alloys, or cobalt-containing compounds deposited on substrate surfaces. These composite structures combine the high reactivity of cobalt with halogen gases with the mechanical support and electrical properties of the substrate, achieving enhanced detection performance that neither material could provide alone
2Reliability
If conventional sensors are used, then detection limits are high, but inability to detect trace contamination leads to yield loss
Solution Approach 1:
By changing the detection threshold parameter through material selection (cobalt-based compounds), the sensor achieves a detection limit of 0.002 ppm, enabling reliable detection of trace halogen contamination that would otherwise go undetected and cause yield loss in semiconductor fabrication processes
3Speed
If faster detection is implemented, then response time decreases, but detection sensitivity at low concentrations may be compromised
Solution Approach 1:
The patent achieves a unique parameter combination where the chemical reactivity parameter of cobalt with halogen gases enables both rapid response (2 hours or less) and high sensitivity (0.002 ppm detection limit). This simultaneous optimization of speed and precision at low concentration levels is not achievable with conventional sensor materials
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 sensors provide real-time, sensitive detection of halogen gases, reducing yield loss by quickly identifying trace halogen contamination, outperforming other metal-based sensors in sensitivity and response time.
Implementation Method 1
a cobalt or cobalt alloy layer that forms a non-volatile cobalt comprising compound upon contact with a gas species comprising at least one halogen
Implementation Method 2
Formation of the cobalt comprising compound results in a detectable change in at least one property as compared to the pre-contact property of the cobalt or cobalt alloy, at lower levels and/or faster than known methods. Disclosed properties that can be detected include electrical, optical, mass change, or other properties
Data Source
AI summary
A method of halogen gas monitoring includes contacting room air to be monitored with a halogen sensor including a cobalt or cobalt alloy layer. The halogen sensor exhibits a detectable change in at least one property upon contact with a halogen gas. A measurement from the halogen sensor is obtained after the contacting. The presence of the halogen gas is monitored based on the measurement.