The electronic state of thin films of yttrium, yttrium hydrides and yttrium oxide

Abstract

Thin films of yttrium hydride have for almost twenty years been under investigation for optoelectronic and solar energy applications due to the hydrogen-induced switching in electronic state from the metallic elemental yttrium and yttrium dihydride to the transparent semiconductor material yttrium trihydride. In this study, we investigate the electronic structure of yttrium, yttrium hydride and yttrium oxide by using x-ray photoelectron spectroscopy and kelvin probe measurements. The investigated samples have been prepared by reactive sputtering deposition. We show that the electronic work function of transparent yttrium hydride is of 4.76 eV and that the recently discovered photochromic reaction lowers the electronic work function of the transparent hydride by 0.2 eV.

Synthesis and Electronic Structure of a 3D Crystalline Stack of MXene-Like Sheets

“…The position of this peak matches that of yttrium carbonate (Y 2 C 3 O 9 ) 59,60 and is too high to be the expected Y 2+ oxidation state (∼156 eV). 61,62 In addition, the spectrum of the carbon 1s core (Figure 5b) reveals two distinct peaks, one centered at 284.6 eV, which is adventitious carbon and one centered at 289.4 eV, which matches that of a carbonate (Figure 5b). 60,63 Moreover, through quantitative XPS analysis, we measure the ratio of Y:O to be 1.0:2.1, which can only be explained by a carbonate, not Y 2 O 3 or YOF.…”

A rare earth hydride supported ruthenium catalyst for the hydrogenation ofN-heterocycles: boosting the activityviaa new hydrogen transfer path and controlling the stereoselectivity

“…The binding energies that can be ascribed to Y 3d 5/2 and Y 3d 3/2 are 157.8 eV and 159.8 eV, while the previously reported results for YH 3 are 157.7 eV and 159.6 eV. 34,35 In the case of Y 2 O 3 , they are 156.8 eV and 158.9 eV. In the case of YH 2 , they are 156.5 eV and 158.5 eV.…”

Formation and EPR response of europium-yttria micro rods

“…Yttria (Y2O3) is a promising material for radiation dosimetry due to its intrinsic chemical and physical properties, including great number of oxygen vacancies that enable insertion of other RE into its structure. Besides, yttria applicability includes sintering, [6] catalysis, [7] luminescence, [8] electrical, [9] electronic, [10] mechanical, [11] and thermal [12] behaviour of many advanced materials. Europium-yttria (Y2O3:Eu 3+ ) is noted for its excellent luminescence .…”