Electronic structure and charge transport in nonstoichiometric tantalum oxide.

Title	Electronic structure and charge transport in nonstoichiometric tantalum oxide.
Authors	T.V. Perevalov; V.A. Gritsenko; A.A. Gismatulin; V.A. Voronkovskii; A.K. Gerasimova; S. Aliev; I.A. Prosvirin
Journal	Nanotechnology
DOI	10.1088/1361-6528/aaba4c
Abstract	The atomic and electronic structure of nonstoichiometric oxygen-deficient tantalum oxide TaO grown by ion beam sputtering deposition was studied. The TaO film content was analyzed by x-ray photoelectron spectroscopy and by quantum-chemistry simulation. TaO is composed of TaO, metallic tantalum clusters and tantalum suboxides. A method for evaluating the stoichiometry parameter of TaO from the comparison of experimental and theoretical photoelectron valence band spectra is proposed. The charge transport properties of TaO were experimentally studied and the transport mechanism was quantitatively analyzed with four theoretical dielectric conductivity models. It was found that the charge transport in almost stoichiometric and nonstoichiometric tantalum oxide can be consistently described by the phonon-assisted tunneling between traps.
Citation	T.V. Perevalov; V.A. Gritsenko; A.A. Gismatulin; V.A. Voronkovskii; A.K. Gerasimova; S. Aliev; I.A. Prosvirin.Electronic structure and charge transport in nonstoichiometric tantalum oxide.. Nanotechnology. 2018;29(26):264001. doi:10.1088/1361-6528/aaba4c

Related Elements

Tantalum

73 Ta 180.948800000 Tantalum

See more Tantalum products. Tantalum (atomic symbol: Ta, atomic number: 73) is a Block D, Group 5, Period 6 element with an atomic weight of 180.94788. Tantalum Bohr Model The number of electrons in each of tantalum's shells is [2, 8, 18, 32, 11, 2] and its electron configuration is [Xe] 4f¹⁴ 5d³ 6s². The tantalum atom has a radius of 146 pm and a Van der Waals radius of 217 pm. High Purity (99.999%) Tantalum (Ta) Metal Tantalum was first discovered by Anders G. Ekeberg in 1802 in Uppsala, Sweden however, it was not until 1844 when Heinrich Rose first recognized it as a distinct element. In its elemental form, tantalum has a grayish blue appearance. Tantalum is found in the minerals tantalite, microlite, wodginite, euxenite, and polycrase. Due to the close relation of tantalum to niobium in the periodic table, Tantalum's name originates from the Greek word Tantalos meaning Father of Niobe in Greek mythology.