Transparent and conductive electrodes by large-scale nano-structuring of noble metal thin-films

Jes Linnet, Anders Runge Walther, Christian Wolff, Ole Albrektsen, N. Asger Mortensen, Jakob Kjelstrup-hansen

Research output: Contribution to journalArticle

Abstract

The widespread use of transparent conductive films in modern display and solar technologies calls for engineering solutions with tunable light transmission and electrical characteristics. Currently, considerable effort is put into the optimization of indium tin oxide, carbon nanotube-based, metal grid, and nano-wire thin-films. The indium and carbon films do not match the chemical stability nor the electrical performance of the noble metals, and many metal films are not uniform in material distribution leading to significant surface roughness and randomized transmission haze. We demonstrate solution-processed masks for physical vapor-deposited metal electrodes consisting of hexagonally ordered aperture arrays with scalable aperture-size and spacing in an otherwise homogeneous noble metal thin-film that may exhibit better electrical performance than carbon nanotube-based thin-films for equivalent optical transparency. The fabricated electrodes are characterized optically and electrically by measuring transmittance and sheet resistance. The presented methods yield large-scale reproducible results. Experimentally realized thin-films with very low sheet resistance, Rsh = 2.01 ± 0.14 Ω/sq, and transmittance, T = 25.7 ± 0.08 %, show good agreement with finite-element method simulations and an analytical model of sheet resistance in thin-films with ordered apertures support the experimental results and also serve to aid the design of highly transparent conductive films. A maximum Haacke number for these 33 nm thin-films, ϕH = 10.7 × 10−3Ω−1 corresponding to T ≃ 80 % and Rsh ≃ 10 Ω/sq, is extrapolated from the theoretical results. Increased transparency may be realizable using thinner metal films trading off conductivity. Nevertheless, the findings of this article indicate that colloidal lithographic patterned transparent conductive films can serve as vital components in technologies with a demand for transparent electrodes with low sheet resistance.
Original languageEnglish
Pages (from-to)1733-1746
JournalOptical Materials Express
Volume8
Issue number7
DOIs
Publication statusPublished - 6 Jun 2018

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Precious metals
Sheet resistance
Thin films
Electrodes
Conductive films
Metals
Carbon Nanotubes
Transparency
Indium
Carbon nanotubes
Carbon films
Chemical stability
Light transmission
Tin oxides
Masks
Analytical models
Surface roughness
Display devices
Vapors
Wire

Bibliographical note

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Funding: MSCA-COFUND-MULTIPLY - Grant number 713694 - H2020.

Cite this

Linnet, J., Walther, A. R., Wolff, C., Albrektsen, O., Mortensen, N. A., & Kjelstrup-hansen, J. (2018). Transparent and conductive electrodes by large-scale nano-structuring of noble metal thin-films. Optical Materials Express, 8(7), 1733-1746. https://doi.org/10.1364/OME.8.001733
Linnet, Jes ; Walther, Anders Runge ; Wolff, Christian ; Albrektsen, Ole ; Mortensen, N. Asger ; Kjelstrup-hansen, Jakob. / Transparent and conductive electrodes by large-scale nano-structuring of noble metal thin-films. In: Optical Materials Express. 2018 ; Vol. 8, No. 7. pp. 1733-1746.
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Linnet, J, Walther, AR, Wolff, C, Albrektsen, O, Mortensen, NA & Kjelstrup-hansen, J 2018, 'Transparent and conductive electrodes by large-scale nano-structuring of noble metal thin-films', Optical Materials Express, vol. 8, no. 7, pp. 1733-1746. https://doi.org/10.1364/OME.8.001733

Transparent and conductive electrodes by large-scale nano-structuring of noble metal thin-films. / Linnet, Jes; Walther, Anders Runge; Wolff, Christian; Albrektsen, Ole; Mortensen, N. Asger; Kjelstrup-hansen, Jakob.

In: Optical Materials Express, Vol. 8, No. 7, 06.06.2018, p. 1733-1746.

Research output: Contribution to journalArticle

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AU - Linnet, Jes

AU - Walther, Anders Runge

AU - Wolff, Christian

AU - Albrektsen, Ole

AU - Mortensen, N. Asger

AU - Kjelstrup-hansen, Jakob

N1 - © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement Funding: MSCA-COFUND-MULTIPLY - Grant number 713694 - H2020.

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N2 - The widespread use of transparent conductive films in modern display and solar technologies calls for engineering solutions with tunable light transmission and electrical characteristics. Currently, considerable effort is put into the optimization of indium tin oxide, carbon nanotube-based, metal grid, and nano-wire thin-films. The indium and carbon films do not match the chemical stability nor the electrical performance of the noble metals, and many metal films are not uniform in material distribution leading to significant surface roughness and randomized transmission haze. We demonstrate solution-processed masks for physical vapor-deposited metal electrodes consisting of hexagonally ordered aperture arrays with scalable aperture-size and spacing in an otherwise homogeneous noble metal thin-film that may exhibit better electrical performance than carbon nanotube-based thin-films for equivalent optical transparency. The fabricated electrodes are characterized optically and electrically by measuring transmittance and sheet resistance. The presented methods yield large-scale reproducible results. Experimentally realized thin-films with very low sheet resistance, Rsh = 2.01 ± 0.14 Ω/sq, and transmittance, T = 25.7 ± 0.08 %, show good agreement with finite-element method simulations and an analytical model of sheet resistance in thin-films with ordered apertures support the experimental results and also serve to aid the design of highly transparent conductive films. A maximum Haacke number for these 33 nm thin-films, ϕH = 10.7 × 10−3Ω−1 corresponding to T ≃ 80 % and Rsh ≃ 10 Ω/sq, is extrapolated from the theoretical results. Increased transparency may be realizable using thinner metal films trading off conductivity. Nevertheless, the findings of this article indicate that colloidal lithographic patterned transparent conductive films can serve as vital components in technologies with a demand for transparent electrodes with low sheet resistance.

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Linnet J, Walther AR, Wolff C, Albrektsen O, Mortensen NA, Kjelstrup-hansen J. Transparent and conductive electrodes by large-scale nano-structuring of noble metal thin-films. Optical Materials Express. 2018 Jun 6;8(7):1733-1746. https://doi.org/10.1364/OME.8.001733