Gas Sensing Mechanism of CuO/ZnO Heterojunction Gas Sensor

이종접합 가스센서의 가스감지기구

P/N(CuO/ZnO) Heterojunction gas sensors were made by 2-step sintering methods and its gas sensing property was measured by varying the injected gases and the operating temperatures. As the applied voltage was increased in air ambients, the current-voltage characteristics shown the ohmic properties. However, when the CO gas ambients, 500 ppm at $200^{\circ}C$, the current-voltage characteristics behaves like a rectifying diode s after 3 mins later and its conduction mechanism is discussed qualitatively for the first times.