Porous antimony-doped tin oxide cathodes formed by supercritical CO2 treatment at low temperature for silver electro-deposition

Tien, W. C.; Chu, A. K.; Wen, H. Y.; Chang, M. Y.; Huang, W. Y.

doi:doi:10.1116/1.3682990

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Journal of Vacuum Science & Technology A / Volume 30 / Issue 2 / Letters

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J. Vac. Sci. Technol. A 30, 020603 (2012); http://dx.doi.org/10.1116/1.3682990 (5 pages)

Porous antimony-doped tin oxide cathodes formed by supercritical CO₂ treatment at low temperature for silver electro-deposition

W. C. Tien, A. K. Chu, H. Y. Wen, M. Y. Chang, and W. Y. Huang

Department of Photonics, National Sun Yat-sen University Kaohsiung, Taiwan

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(Published online 8 February 2012)

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Porous antimony-doped tin oxide (ATO) cathodes for silver electrodeposition devices are proposed. The porous structure of the cathodes is obtained by applying supercritical CO₂ (SCCO₂) treatment at 60 °C on spin-coated ATO nanoparticles. The morphological, structural, and electrical properties of the ATO cathodes with the SCCO₂ treatment are investigated. The 0.5 μm thick ATO cathode grown on ITO glass substrates is transparent. However, black state of the device is observed when silver molecules are anchored onto the surface of the ATO cathode during reduction. The average transmission contrast ratio of 12 is obtained in visible spectrum at a driving voltage of 1.5 V and a saturation current density of 5.8 mA/cm². In addition, the electrochromic switching time is 4.5 s for a 0.5 × 0.5 cm device with 65 μm cell gap and 0.08 M electrolyte concentration, and its transmission contrast ratio is better than 9.0 at λ = 633 nm.

Article Outline

INTRODUCTION
EXPERIMENT
RESULTS AND DISCUSSION
CONCLUSIONS

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KEYWORDS and PACS

Keywords

antimony, electrochemical electrodes, electrochromic devices, electrodeposition, electrolytes, nanofabrication, nanoparticles, porous materials, silver, spin coating, tin compounds, transparency, visible spectra

PACS

81.07.Bc

Nanocrystalline materials
81.15.Pq

Electrodeposition, electroplating
78.67.Bf

Nanocrystals, nanoparticles, and nanoclusters
78.40.Kc

Metals, semimetals, and alloys
82.45.Gj

Electrolytes
78.20.Ci

Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

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History

Received 24 October 2011
Accepted 18 January 2012
Published online 8 February 2012

Digital Object Identifier

http://dx.doi.org/10.1116/1.3682990

PUBLICATION DATA

ISSN

0734-2101 (print)

1520-8559 (online)

Publisher

American Vacuum Society

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