The optical transparency of palladium layers within the wavelength region from 0.5 to 1.1 μm in air and in gaseous mixtures containing hydrogen in the range of 0.1 to 100 vol.% has been studied. The thermal-vacuum deposition method was used to prepare palladium layers on glass substrate. Buger’s law is implemented for layers thickness of order 450 Å. Pd layers of more than 1200 Å are damaged in 100% hydrogen medium. At some hydrogen concentration between 1-10 vol.% a sharp increase in Pd layer transparency is observed that is intrinsic for the first-order phase transition. The layer transparency change speed increases linearly with increasing the hydrogen concentration in gas medium.
The variation rate of the short-circuit photocurrent of Pd/ n -InP Schottky diodes is studied as a function of the presence of hydrogen in a gas mixture with H_2 concentrations of 1–100 vol %. It is shown that upon the simultaneous exposure of the Schottky diode to a hydrogen-containing gas mixture and to light (λ = 0.9 μm), the hydrogen concentration in the gas mixture and the Pd/ n -InP diode photocurrent variation rate are related exponentially. The Schottky-diode response rate to the presence of hydrogen in the gas mixture increases with the illumination intensity.
The influence of hydrogen on the electrical properties of Pd /n -InP and Pd/oxide/ n -InP structures is studied. It is found that a variation in the cutoff voltage $$\Delta {{U}_{{{\text{cut-off}}}}}$$ in the current–voltage characteristics of the structures under study upon exposure to hydrogen with concentrations of 0–1 vol % in a nitrogen–hydrogen mixture is described by the exponential dependence: $$\Delta {{U}_{{{\text{cut-off}}}}}$$ = a [1 – exp(– b ⋅ N _H)], where N _H is the hydrogen concentration (vol %), and a and b are constants dependent on the type of structures. It is shown that a decisive influence on how the potential-barrier height changes in the Pd / InP and Pd / oxide / InP structures in the presence of H_2 in a gas medium is exerted by a change in the Pd work function in an atmosphere of hydrogen. It is found that, in the structures under study, tunneling and thermal-tunneling charge-transport mechanisms operate at 90–300 K in the presence of hydrogen and without it. With increasing hydrogen concentration in the gas mixture, the predominance of the tunneling charge-transport mechanism becomes more pronounced.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.