Background:
At present, the main problems of Micro-Electro-Mechanical Systems (MEMS) temperature
detector focus on the narrow range of temperature detection, difficulty of the high temperature measurement. Besides,
MEMS devices have different response characteristics for various surrounding temperature in the petrochemical and
metallurgy application fields with high-temperature and harsh conditions. To evaluate the performance stability of the hightemperature MEMS devices, the real-time temperature measurement is necessary.
Objective:
A schottky temperature detector based on the metal/n-ZnO/n-Si structures is designed to measure high
temperature (523~873K) for the high-temperature MEMS devices with large temperature range.
Method:
By using the finite element method (FEM), three different work function metals (Cu, Ni and Pt) contact with the
n-ZnO are investigated to realize Schottky. At room temperature (298K) and high temperature (523~873K), the current
densities with various bias voltages (J-V) are studied.
Results:
The simulation results show that the high temperature response power consumption of three schottky detectors of
Cu, Ni and Pt decreases successively, which are 1.16 mW, 63.63 μW and 0.14 μW. The response temperature sensitivities
of 6.35 μA/K, 0.78 μA/K, and 2.29 nA/K are achieved.
Conclusion:
The Cu/n-ZnO/n-Si schottky structure could be used as a high temperature detector (523~873K) for the hightemperature MEMS devices. It has a large temperature range (350K) and a high response sensitivity is 6.35 μA/K. Compared
with traditional devices, the Cu/n-ZnO/n-Si Schottky structure based temperature detector has a low energy consumption of
1.16 mW, which has potential applications in the high-temperature measurement of the MEMS devices.
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