Micropillar Gas Flow Sensor for Real-Time Process Monitoring
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Solution Overview
Problem
Current semiconductor fabrication processes lack a cost-effective, real-time method to monitor gas flow and process byproducts, leading to lower precision and increased manufacturing costs due to the high expense and limited capabilities of existing analytical tools like TOF-SIMS and RGA.
Innovation Solution
A sensor element with a high-aspect-ratio micropillar structure is developed, featuring a substrate with a channel and conductive pillars that measure gas flow rate and composition by detecting frequency and resistance changes, allowing for real-time monitoring of gas flow and process progress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TOF-SIMS is used for wafer surface elemental analysis, then measurement precision is improved, but device cost and size increase significantly
Solution Approach 1:
The patent extracts the essential detection function from the complex TOF-SIMS system by using a simple conductive layer on micropillars that interacts with gas flow to generate measurable electrical signals, eliminating the need for expensive mass spectrometry equipment while maintaining real-time detection capability
Solution Approach 2:
The patent creates a simplified copy of the elemental analysis function by using gas flow interaction with conductive micropillars to infer process conditions, replacing the direct mass spectrometry approach with an indirect but equally informative electrical measurement system
2Measurement precision
If RGA is used for gas analysis, then measurement precision is improved, but device cost increases and it cannot analyze gas mixtures
Solution Approach 1:
The patent creates a universal sensor that can detect various gases and gas mixtures simultaneously by measuring flow rate and composition effects on the conductive micropillars, replacing the single-gas-specific RGA with a multi-functional detection system
Solution Approach 2:
The patent copies the gas detection function using a fundamentally different approach - instead of mass spectrometry, it uses electrical measurements of conductive micropillars affected by gas flow, achieving similar informational output with simpler equipment
3Productivity
If real-time monitoring is implemented, then productivity is improved, but device cost increases
Solution Approach 1:
The patent copies the real-time monitoring function using inexpensive conductive micropillars and simple electrical measurement circuits, replacing expensive specialized equipment while maintaining continuous process monitoring capability
Solution Approach 2:
The micropillars with conductive layers serve themselves as both the sensing element and the signal generation source, eliminating the need for complex external detection systems - the gas flow itself modifies the electrical properties of the pillars, providing direct real-time feedback
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 sensor element provides reliable, real-time monitoring of gas flow and process conditions, enhancing precision and yield while reducing costs through accurate detection of gas flow rates and compositions, enabling timely feedback and control during semiconductor fabrication.
Implementation Method 1
a plurality of micro-scale pillars formed in the channel and interfering with the flow of the gas moving through the channel
Implementation Method 2
a conductive layer formed on a surface of the plurality of pillars by deposition
Data Source
AI summary
A sensor element has a substrate, a channel formed in the substrate, and serving as an inlet passage of the gas, a plurality of micro-scale pillars formed in the channel and interfering with the flow of the gas moving through the channel, and a conductive layer formed on a surface of the plurality of pillars by deposition. A sensor has the sensor element, and a metering module electrically connected to the conductive layer, and configured to measure an electrical signal generated by the interference of the plurality of pillars with the flow of the gas.