Physics – Condensed Matter – Materials Science
Scientific paper
2010-05-18
Journal of Applied Physics vol. 108, 054318 (2010)
Physics
Condensed Matter
Materials Science
17 pages, 7 figures
Scientific paper
10.1063/1.3476278
We suggest a wavelength-dependent figure of merit for transparent conducting nanotube networks, composed of the sheet resistance and the optical density. We argue that this would be more useful than other suggestions prevailing in the literature, because it relies on more realistic assumptions regarding the optical parameters of real nanotubes: it takes into account the fact that the dc resistivity depends on the concentration of free carriers, while the visible absorption is caused by bound carriers. Based on sheet resistance measurements and wide-range transmission spectra, we compare several commercial nanotube types and find correlation between metal enrichment and figure of merit. A simple graphical approach is suggested to determine if the required optical and transport properties can be achieved by varying the thickness of the nanotube layer or a more aggressive treatment is needed. The procedure can be extended to oxide coatings as well.
Kamaras Katalin
Pekker Aron
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