Hydrogen Sensor Stress Isolation via Segmentation
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Solution Overview
Problem
Existing semiconductor devices for measuring hydrogen concentrations are susceptible to external mechanical influences that can interfere with accurate hydrogen detection, making them unreliable for independent hydrogen measurements.
Innovation Solution
A semiconductor device with a hydrogen-active sensor layer that changes mechanical stress upon hydrogen contact, protected by a deformable structure such as trenches in the substrate or an adhesive connection, which absorbs and dampens unwanted mechanical stresses, allowing for precise hydrogen concentration measurement using piezoresistive or piezomagnetic effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor layer is exposed to the medium for hydrogen detection, then hydrogen measurement capability is improved, but the sensor becomes susceptible to external mechanical stresses that interfere with accurate detection
Solution Approach 1:
The sensor chip is divided into distinct functional regions: a sensor region containing the hydrogen-active sensor layer for detection, and a reference region with an identical structure but without the sensor layer. This segmentation allows the reference region to compensate for mechanical stresses, enabling accurate hydrogen measurement despite external stress interference.
Solution Approach 2:
A reference layer or reference region is introduced as an intermediary element that experiences the same mechanical stresses as the sensor layer but does not interact with hydrogen. By comparing the sensor layer response with the reference layer response, the mechanical stress influence is eliminated, leaving only the hydrogen-specific signal.
2Reliability
If the sensor chip is integrated into a semiconductor device with housing and connections, then device functionality and protection are improved, but mechanical stresses from mounting and handling increase
Solution Approach 1:
The sensor region and reference region are designed with identical local structures and materials to ensure they experience equal mechanical stresses. This local quality matching ensures that any stress-induced changes affect both regions equally, allowing differential measurement to cancel out the stress effects while preserving the hydrogen detection capability.
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 solution effectively isolates the sensor from external mechanical stresses, ensuring accurate and reliable hydrogen detection by converting mechanical stress changes into electrical signals, thereby enhancing measurement precision and independence from external influences.
Implementation Method 1
hydrogen can change the mechanical stress in a layer, e.g., owing to diffusion and/or adsorption
Implementation Method 2
hydrogen can change the mechanical stress in a layer, e.g., owing to diffusion and/or adsorption
Implementation Method 3
using piezoresistive or piezomagnetic effects
Implementation Method 4
using piezoresistive or piezomagnetic effects
Data Source
AI summary
The application relates to a semiconductor device for measuring hydrogen including a sensor chip having a sensor layer, which changes its mechanical stress upon contact with hydrogen. The sensor chip furthermore has a sensor for detecting the change in stress, wherein the construction of the semiconductor device affords the sensor layer and/or the sensor protection against further mechanical stresses. The application furthermore relates to a method for measuring a hydrogen concentration.