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Au thin films deposited on SnO2:In and glass: Substrate effects on the optical and electrical properties
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2011 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 519, no 6, 1930-1933 p.Article in journal (Refereed) Published
Abstract [en]

We report on a detailed study on the optical and electrical properties of Au films made by sputter deposition onto glass substrates with and without transparent and electrically conducting layers of SnO2:In. The Au films had thicknesses up to 10.7 nm and hence spanned the range for thin film growth from discrete islands, via large scale coalescence and formation of a meandering conducting network, to the formation of a more or less "holey" film. Scanning electron microscopy and atomic force microscopy demonstrated that the SnO2:In films were considerably rougher than the glass itself, and this roughness influenced the Au film formation so that large scale coalescence set in at a somewhat larger thickness for films on SnO2:In than on glass. Measurements of spectral optical transmittance and reflectance and of electrical resistance gave a fully consistent picture that could be reconciled with impeded Au film formation on the SnO2:In layer; this led to pronounced "plateaus" in the near infrared optical spectra for Au films on SnO2:In and a concomitant change from such two-layer films having a lower resistance than the single gold film at thicknesses below large scale coalescence to the opposite behavior for larger film thicknesses. Our work highlights the importance of the substrate roughness for transparent conductors comprising coinage metal films backed by wide band gap transparent conducting oxides.

Place, publisher, year, edition, pages
2011. Vol. 519, no 6, 1930-1933 p.
Keyword [en]
Transparent conductors, Gold films, Indium doped tin oxide, Sputter deposition, Optical properties, Electrical resistance, Thin film growth, Large scale coalescence
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-148464DOI: 10.1016/j.tsf.2010.09.048ISI: 000287339000028OAI: oai:DiVA.org:uu-148464DiVA: diva2:402356
Available from: 2011-03-08 Created: 2011-03-07 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Gold-Based Nanoparticles and Thin Films: Applications to Green Nanotechnology
Open this publication in new window or tab >>Gold-Based Nanoparticles and Thin Films: Applications to Green Nanotechnology
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The use of gold-based nanoparticles and thin films is very promising when it comes to improving several green nanotechnologies. Therefore, in order to further their use in applications such as electrochromic devices, photovoltaics, light-emitting diodes and photocatalysis, the aim of this work was to study the growth of gold-based nanoparticles and thin films.

All depositions were made using DC magnetron sputtering, and optical, structural, electrochemical, electrical and photocatalytic studies of the films and particles were performed.

The various applications yield a variety of substrate properties, and how these substrate properties affect gold coalescence was studied by depositing gold on glass slides and on SnO2:In, ITO and TiO2 base layers.

Temperature also affects the gold coalescence. Therefore, gold was deposited on heated and non-heated substrates, where the latter were also post-heated, with a temperature range between 25ºC and 140ºC in both cases. Various temperatures were also used for manufacturing gold nanoparticles, and their effect as photocatalytic improvers was tested on WO3 films.

The optical properties of Au films on glass were determined by ellipsometry in the 0.25 – 2 µm range, and then a spectral density analysis was performed of the effective dielectric permittivity.

This work showed that thin gold films are excellent replacements for oxide-based transparent conductors in electrochromic devices. It was also shown that thin homogeneous gold films were better conductors when they were deposited on glass, compared to when they were deposited on oxide base layers, regardless of the optical, electrical and structural properties, or the doping concentration of the base layers.

The results also showed that thin gold films were durable at 76ºC, and hence hold for a typical window temperature of ~70ºC. For higher temperatures, gold deposition on heated and non-heated substrates resulted in a distinct difference in growth, and there was also a distinct difference between post-heated gold films produced at 25ºC, compared to when the films were deposited on heated substrates. In the latter case, an island structure was obtained at 140ºC.

Spectral density analysis gave spectral densities of similar shape for nanoparticles and continuous gold films, which is useful information for further investigations.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 100 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 950
Keyword
green nanotechnology, transparent conductors, nanoparticles, gold coalescence, substrate effect, temperature effect
National Category
Nano Technology
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-179173 (URN)978-91-554-8420-0 (ISBN)
Public defence
2012-09-21, Häggsalen, Ångström laboratoriet, Lägerhyddsvägen 1, Uppsala, 09:30 (English)
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Supervisors
Available from: 2012-08-30 Created: 2012-08-08 Last updated: 2013-01-22

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Lansåker, Pia CGunnarsson, KlasRoos, ArneNiklasson, GunnarGranqvist, Claes-Göran

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