Suspended AlGaN/GaN HEMT NO2 Gas Sensor Integrated with Micro-heater
Jianwen Sun (TU Delft - Electronic Components, Technology and Materials, China Research Institute)
Robert Sokolovskij (TU Delft - Electronic Components, Technology and Materials, Southern University of Science and Technology , State Key Laboratory of Solid State Lighting)
E Iervolino (TU Delft - Electronic Components, Technology and Materials)
Zewen Liu (Tsinghua University)
Pasqualina Sarro (TU Delft - Electronic Components, Technology and Materials)
Guo Qi Zhang (TU Delft - Electronic Components, Technology and Materials)
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Abstract
We developed an AlGaN/GaN high electron mobility transistor (HEMT) sensor with a tungsten trioxide (WO3) nano-film modified gate for nitrogen dioxide (NO2) detection. The device has a suspended circular membrane structure and an integrated micro-heater. The thermal characteristic of the Platinum (Pt) micro-heater and the HEMT self-heating are studied and modeled. A significant detection is observed for exposure to a low concentration of 100 ppb NO2 /N2 at ∼300 °C. For a 1 ppm NO2 gas, a high sensitivity of 1.1% with a response (recovery) time of 88 second (132 second) is obtained. The effects of relative humidity and temperature on the gas sensor response properties in air are also studied. Based on the excellent sensing performance and inherent advantages of low power consumption, the investigated sensor provides a viable alternative high performance NO2 sensing applications. It is suitable for continuous environmental monitoring system or high temperature applications.