High Selectivity Hydrogen Gas Sensor Based on WO₃/Pd-AlGaN/GaN HEMTs

We investigated the hydrogen gas sensors based on AlGaN/GaN high electron mobility transistors (HEMTs) for high temperature sensing operation. The gate area of the sensor was functionalized using a 10 nm Pd catalyst layer for hydrogen gas sensing. A thin WO₃ layer was deposited on top of the Pd layer to enhance the sensor selectivity toward hydrogen gas. At 200 °C, the sensor exhibited high sensitivity of 658% toward 4%-H₂, while exhibiting only a little interaction with NO₂, CH₄, CO₂, NH₃, and H₂S. From 150 °C to 250 °C, the 10 ppm hydrogen response of the sensor was at least eight times larger than other target gases. These results showed that this sensor is suitable for H₂ detection in a complex gas environment at a high temperature.