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Electrical Properties of Magnesium Carbon Co-Sputtered Thin Films Applied Post Hydroxylation Treatment

Published online by Cambridge University Press:  12 January 2012

Masafumi Chiba ,
Daisuke Endo ,
Mikihiko Maizono ,
Mikiteru Higashi  and
Hideo Kiyota
Masafumi Chiba
Affiliation:
Department of Materials Chemistry, Tokai University, 317 Nishino, Numazu, Shizuoka 410-0395, Japan
Daisuke Endo
Affiliation:
Department of Materials Chemistry, Tokai University, 317 Nishino, Numazu, Shizuoka 410-0395, Japan
Mikihiko Maizono
Affiliation:
Course of Materials Science and Technology, Graduate School of Tokai University, 317 Nishino, Numazu, Shizuoka 410-0395, Japan
Mikiteru Higashi
Affiliation:
Department of Materials Chemistry, Tokai University, 317 Nishino, Numazu, Shizuoka 410-0395, Japan
Hideo Kiyota
Affiliation:
Department of Mechanical Systems Engineering, Tokai University, 9-1-1 Toroku, Kumamoto, Kumamoto 862-8652, Japan
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Abstract

Indium oxide doped with tin oxide, or ITO, has been widely used as an electrode material for flat panel displays. However, the rare metal in ITO is a limited natural resource. We succeeded in developing a material composed solely of elements with abundant reserves. We present the results of analyzing the electronic structure of an Mg-based compound based on its electrical conductivity. Mg-C thin films were prepared by sputtering method. A new transparent and electrically conductive material, Mg(OH)2-C, was formed after reacting the Mg-C film with moisture in air. On average, its transmittance of visible light was 90%. The mechanism for the effect of carbon on the electrical conductivity of Mg(OH)2 was examined on the basis of XPS spectra and DV-Xa molecular orbital calculations. The value of the band gap shows that Mg(OH)2 is an insulator. It was revealed that a new orbital appears when the number of substituting carbon atoms increases in the Mg(OH)2 lattice. It was possible to measure the new orbital that consisted of C-2s and C-2p. In addition, a comparison between the calculated electronic state around the valence band and the result measured by XPS of the obtained film reveals that they are in extremely close agreement.

Keywords

transparent conductorelectronic structurex-ray photoelectron spectroscopy (XPS)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1406: Symposium Z – Functional Metal-Oxide Nanostructures , 2012 , mrsf11-1406-z18-58
Copyright
Copyright © Materials Research Society 2012

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