Superhydrophobic Sensor Semiconductor Device for Humidity Measurement
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Solution Overview
Problem
Sensor semiconductor devices used to measure relative humidity face challenges in accurately measuring humidity under high humidity conditions due to water condensation and contamination, which requires a recovery time and can lead to inaccurate readings.
Innovation Solution
A sensor semiconductor device with a transducer comprising a capacitor and a superhydrophobic top surface, where the top surface is structured to repel water and contaminants, allowing for immediate detection of humidity changes without prolonged recovery times and maintaining measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the top surface is made hydrophobic to prevent water condensation, then the recovery time is reduced, but the surface area available for moisture absorption is decreased
Solution Approach 1:
The top surface is structured with a porous or microstructured geometry that creates superhydrophobic properties. This porous structure reduces water condensation by facilitating water bead formation and roll-off, while the high surface area-to-volume ratio of the porous structure maintains adequate moisture absorption capability for humidity sensing.
Solution Approach 2:
The invention transitions from a flat two-dimensional surface to a three-dimensional microstructured surface. By adding vertical dimension through micropillars, pores, or other microstructures, the surface achieves superhydrophobicity while maintaining effective sensing area through the complex 3D geometry.
2Object-affected harmful factors
If the top surface is made superhydrophobic to repel water, then water droplets are repelled, but the surface area for moisture absorption is reduced
Solution Approach 1:
The top surface incorporates a porous or microstructured material that creates superhydrophobic effects. The porous structure facilitates water repellency through air trapping and reduced solid-liquid contact, while the complex internal surface area of the pores maintains moisture absorption capability for accurate humidity measurement.
3Reliability
If the top surface is structured to be superhydrophobic, then contamination is prevented, but the surface area is decreased
Solution Approach 1:
The porous or microstructured top surface creates superhydrophobic properties that prevent contamination by water and water-soluble substances. The porous structure minimizes contaminant adhesion while the high surface area-to-volume ratio maintains adequate moisture absorption for reliable humidity sensing.
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 superhydrophobic surface enables quick detection of humidity changes and prevents contamination, ensuring accurate and rapid measurement of relative humidity, even under high humidity conditions.
Implementation Method 1
At least a part of the top surface is superhydrophobic. This means at least a part of the top surface repels water.
Implementation Method 2
The polymer is able to absorb water and the top surface is arranged such that it is exposed to the environment of the sensor semiconductor device. The polymer can reversibly collect or absorb water from the air
Implementation Method 3
the dielectric constant of the polymer depends on the amount of collected water or moisture. This means, the dielectric constant of the polymer is a measure for the relative humidity in the environment of the sensor semiconductor device. As the polymer is arranged between at least two electrodes of the capacitor, the capacitance of the capacitor depends on the dielectric constant of the polymer.
Data Source
AI summary
A sensor semiconductor device comprises a transducer which comprises a capacitor with at least two electrodes. The transducer further comprises a polymer which is arranged between at least two electrodes of the capacitor, and a top surface of the transducer. The polymer is able to absorb water and the top surface is arranged such that it is exposed to the environment of the sensor semiconductor device. Furthermore, at least a part of the top surface is superhydrophobic and the sensor semiconductor device is capable of measuring the humidity of the environment of the sensor semiconductor device.