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Proceedings Paper

An indium-oxide electrode with discontinuous Au layers for plasmonic devices
Author(s): Y. Vygranenko; G. Lavareda; V. André; P. Brogueira; A. Amaral; M. Fernandes; A. Fantoni; M. Vieira
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Paper Abstract

In this contribution we report on a low cost plasmonic electrode for light-sensing applications. The electrode combines a conducting nonstoichiometric indium oxide (InOx) layer with an ultrathin (~5 nm) discontinuous Au layer. The InOx and Au layers were deposited on glass substrates by plasma enhanced reactive thermal evaporation and thermal evaporation, respectively. Several device configurations with one or two Au layer(s) sandwiched between InOx layers were fabricated and characterized. The morphological and structural properties of both Au and InOx layers were analyzed using AFM and XRD techniques. In particular, the effect of thermal annealing (673 K, 15 min) on the surface morphology of Au layers grown on bare glass and InOx-coated substrate was investigated. It has been also found that the oxide film grown above an underlying nanostructured Au layer is amorphous, while a reference InOx film on glass is nanocrystalline with a smooth surface. The electrical properties of InOx grown on the Au surface are worsened due to Au-induced structural disorder. The observed difference in transmission spectra of the glass/InOx/Au and glass/Au/InOx structures indicates the difference in the morphology of the metal layer. Thus, the optical and morphological properties of the InOx electrode can be varied in a wide range by incorporating several Au layers.

Paper Details

Date Published: 5 March 2020
PDF: 7 pages
Proc. SPIE 11281, Oxide-based Materials and Devices XI, 1128127 (5 March 2020); doi: 10.1117/12.2545958
Show Author Affiliations
Y. Vygranenko, CTS-UNINOVA (Portugal)
G. Lavareda, CTS-UNINOVA (Portugal)
Univ. Nova de Lisboa (Portugal)
V. André, Univ. de Lisboa (Portugal)
P. Brogueira, CeFEMA (Portugal)
Univ. de Lisboa (Portugal)
A. Amaral, CeFEMA (Portugal)
Univ. de Lisboa (Portugal)
M. Fernandes, CTS-UNINOVA (Portugal)
Instituto Politécnico de Lisboa ISEL (Portugal)
A. Fantoni, CTS-UNINOVA (Portugal)
Instituto Politécnico de Lisboa ISEL (Portugal)
M. Vieira, CTS-UNINOVA (Portugal)
Instituto Politécnico de Lisboa ISEL (Portugal)

Published in SPIE Proceedings Vol. 11281:
Oxide-based Materials and Devices XI
David J. Rogers; David C. Look; Ferechteh H. Teherani, Editor(s)

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