Strain Gauge Sensor with Piezoelectric Schottky Junction
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Solution Overview
Problem
Existing strain gauge sensors in chip sensors with cantilevers suffer from limited accuracy, high power consumption, and unsatisfactory gauge factors, which restrict their service life in energy-autonomous devices and are prone to manufacturing defects.
Innovation Solution
A method for fabricating a sensor with a polymer body and a strain gauge featuring a Schottky junction, where the Schottky junction comprises a piezoelectric semiconductor material with a wurtzite crystalline structure and a metal electrode, grown using atomic layer deposition (ALD) on a polymer layer, with specific temperature and oxygen pulsing conditions to enhance the Schottky barrier and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional strain gauge manufacturing processes are used, then the sensor can be fabricated, but the manufacturing precision is poor and defects occur
Solution Approach 1:
The patent applies atomic layer deposition (ALD) technology to deposit the piezoelectric semiconductor layer, changing the manufacturing process parameters from conventional methods to a more precise deposition technique. This enables better control of layer thickness and composition, improving manufacturing precision and reducing defects in the strain gauge fabrication.
2Duration of action of moving object
If conventional strain gauge structures are used, then the sensor operates, but the power consumption is high, limiting service life in energy-autonomous devices
Solution Approach 1:
The patent replaces conventional piezoresistive strain gauge mechanisms with a piezoelectric-based detection system. The piezoelectric semiconductor material generates electrical signals directly in response to mechanical strain, eliminating the need for complex bridge circuits and reducing overall power consumption, thereby extending service life in energy-autonomous devices.
3Measurement precision
If conventional strain gauge materials are used, then the sensor functions, but the gauge factor is insufficient, limiting detection accuracy
Solution Approach 1:
The patent employs composite material structures, combining piezoelectric semiconductor materials (such as ZnO, GaN, or InN) with appropriate metal electrodes to form Schottky junctions. This composite approach leverages the high piezoelectric coefficients of these materials to achieve superior gauge factors and enhanced strain detection accuracy compared to conventional homogeneous materials.
4Measurement precision
If the Schottky junction is formed with optimal conditions, then the gauge factor improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent optimizes the ALD deposition parameters, including temperature (60-100°C), pressure, and precursor delivery rates, to achieve the desired Schottky junction characteristics. By carefully controlling these parameters, the process achieves high gauge factors while maintaining feasibility for integrated manufacturing, balancing performance with process complexity.
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 method improves the accuracy and reduces power consumption of strain gauge sensors, enhancing the gauge factor and minimizing defects, thereby extending the service life and improving performance in energy-autonomous devices.
Implementation Method 1
an active layer including a piezoelectric semiconductor material, preferably with a wurtzite crystalline structure
Implementation Method 2
growing the active layer by atomic layer deposition (ALD) on the polymer layer
Implementation Method 3
the Schottky junction further comprising at least one metal electrode electrically connected to the active layer
Data Source
AI summary
method of fabricating a sensor including a polymer body and a strain gauge including at least one Schottky junction. The Schottky junction includes an active layer including a piezoelectric semiconductor material, preferably with a wurtzite crystalline structure. The Schottky junction further including at least one metal electrode electrically connected to the active layer. The method including the following steps: forming a polymer layer, growing the at least one metal electrode on the polymer layer, then growing the active layer by atomic layer deposition, ALD, on the polymer layer and on the metal electrode. A sensor includes a polymer body and a cantilever including a strain gauge obtained by ALD. A gauge factor of 150 is achieved at different frequencies.