Comprehensive study on hydrogen sensing properties of a Pd–AlGaN-based Schottky diode

SiO2 passivation effect on the hydrogen adsorption performance of a Pd/AlGaN-based Schottky diode

“…9 is 14.1 kJ mol −1 . As compared with E a values of Pd/AlGAN/GaN one (25 kJ mol −1 ) and previously reported works [29], the studied MOS device exhibits a lower E a value except for the Pd/InP hydrogen sensor (12.1 kJ mol −1 ). Low activation energy represents that lower energy is required for hydrogen atoms to overcome the barrier for hydrogen adsorption at metal-oxide interface.…”

Fabrication of Pd Doped WO3 Nanofiber as Hydrogen Sensor

“…Reports of various technologies for hydrogen sensing include FETs [1,2], optical fibers [3,4], thermoelectric [5,6], Schottky diodes [7][8][9], surface acoustic wave devices [10,11] and metal oxides [12][13][14][15][16][17]. Metal oxide sensors are under intensive development and have been studied for decades [18,19].…”

Hydrogen sensing characteristics of Pd/SiO2-nanoparticles (NPs)/AlGaN metal-oxide-semiconductor (MOS) diodes

“…This could be attributed to the increase of MOS area when the C SiO 2 is increased. It is known that, based on the Schottky diode-type hydrogen sensing mechanism [1,19], f B decreases when hydrogen gas is introduced. Thus, the Schottky barrier height variation Df B is a critical parameter to study hydrogen sensing behaviors.…”

“…The adsorbed oxygen molecules result in the formation of hydroxyl and water on the sensor's surface [21]. The response and recovery time constants, i.e., t a and t b , are defined as the time needed for the current to reach 1Àe À1 (63%) of the final steady-state level from the original baseline one [1,14]. Fig.…”

“…Recently, based on its benefits of renewable, sustainable, and clean properties, hydrogen has become one of the candidates for replacement of petroleum fossils to develop friendly environments [1,2]. However, hydrogen gas is dangerous due to its inherent autoignition and explosive nature when the hydrogen concentration is greater than 4.65 vol% [3].…”