The objective of this study is to reveal the atomistic state of hydrogen in electrodeposited Ni-P films by thermal desorption spectroscopy. Two peaks corresponding to the desorption of hydrogen occupying regular interstitial sites and the break-up of vacancy-hydrogen (Vac-H) clusters were observed in electrodeposited pure Ni film. With an increase in phosphorus content, the crystallinity of electrodeposited Ni-P films decreased and the hydrogen desorption from the interstitial sites and Vac-H clusters disappeared. The amount of diffusible hydrogen increased abruptly with the increase in the amorphous phase in Ni-P film.

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We have fabricated a diode with a multiple stacked Si-QDs structure and a single layer graphene top electrode, and studied their electron field emission properties. Electron emission current from the diode was observed by the application of forward biases of 6.0 V and over, which is ~1.0 V lower than that from a diode with a Au top electrode. In addition, we found that electron emission efficiency was increased by a factor of ~ 100 by replacing the top electrode from Au to graphene. This result is explained by the reduction of electron scattering at the top electrode. The results lead to the development of high efficiency planar-type electron emission devices.

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