Improvement of the effective work function and transmittance of thick indium tin oxide/ultrathin ruthenium doped indium oxide bilayers as transparent conductive oxide

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Abstract

Rutheniumdoped indiumoxide (In1-xRuxOy) films fabricated using DC magnetron co-sputteringwith In2O3 and Ru targets were investigated for use as transparent conductive oxides. The In1-xRuxOy films had an amorphous structure in the wide compositional range of x = 0.3-0.8 and had an extremely smooth surface. The transmittance and resistivity of the In1-xRuxOy films increased as the Ru content increased. The transmittance of the In0.38Ru0.62Oy film improved to over 80%when the film thicknesswas less than 5 nm,while the specific resistivity (ρ) was kept to a low value of 1.6 × 10-4 Ω cm. Based on these experimental data, we demonstrated that thick indium tin oxide (In0.9Sn0.1Oy, ITO) (150 nm)/ultrathin In0.38Ru0.62Oy (3 nm) bilayers have a high effective work function of 5.3 eV, transmittance of 86%, and low ρ of 9.2 × 10-5 Ω cm. This ITO/In0.38Ru0.62Oy bilayer is a candidate for use as an anode for organic electroluminescent devices.

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Taweesup, K., Yamamoto, I., Chikyow, T., Lothongkum, G., Tsukagoshi, K., Ohishi, T., … Nabatame, T. (2016). Improvement of the effective work function and transmittance of thick indium tin oxide/ultrathin ruthenium doped indium oxide bilayers as transparent conductive oxide. Thin Solid Films, 598, 126–130. https://doi.org/10.1016/j.tsf.2015.11.070

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