1.Key Laboratory of Micro/Nano Devices and Systems,Ministry of Education,North University of China,Taiyuan 030051,China
2.State Key Laboratory of Extreme Environment Optoelectronic Dynamic Measurement Technology and Instrument,North University of China,Taiyuan 030051,China
To meet the pressure measurement requirements in harsh conditions such as high temperatures and vibrations in fields like aerospace and energy industry, a piezoresistive pressure sensor based on insulator-on-silicon (SOI) material is designed in this paper. This sensor uses the buried oxygen layer of SOI material to achieve electrical isolation between the piezoresistive element and the substrate, solving the performance degradation problem of traditional silicon-based sensors caused by P-N junction leakage at high temperatures.The core design of the sensor includes: using an E-shaped island membrane structure as the elastic sensitive film, optimizing the membrane size through finite element simulation to ensure sensitivity while reducing non-linear error; completing the chip fabrication, achieving the preparation of piezoresistive elements and electrodes through the process; adopting the film isolation filled with oil packaging technology, injecting high-temperature silicone oil to transfer pressure,avoiding the influence of gold migration on signal transmission. The performance test results show that this sensor performs excellently under full-scale overload pressure, with a sensitivity of 0.099 mV/kPa/V at room temperature, a full-scale output of 99.990 1 mV, a pressure hysteresis of less than 0.021 2%FS, a repeatability of 0.020%FS, and can work stably in high-temperature environments,meeting the measurement requirements of complex conditions.
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