title: Influence of the diameter of single-walled carbon nanotube bundles on the optoelectronic performance of dry-deposited thin films.
abstract: The optoelectronic performance of thin films of single-walled carbon nanotubes (SWCNTs) was studied with respect to the properties of both individual nanotubes and their bundles. The SWCNTs were synthesized in a hot wire generator aerosol reactor, collected by gas filtration and dry-transferred onto various substrates. By thus completely avoiding liquid dispersion steps, we were able to avoid any artifacts from residual surfactants or sonication. We found that bundle lengths determined the thin-film performance, as would be expected for highly resistive bundle-bundle junctions. However, we found no evidence that contact resistances were affected by the bundle diameters, although they did play a secondary role by simply affecting the absorption. The individual SWCNT diameters and their graphitization level as gauged by the Raman D band intensity did not show any clear correlation with the overall performance.
authors.affiliation: NanoMaterials Group, Department of Applied Physics, Aalto University School of Science, P.O. Box 15100 (Puumiehenkuja 2), 00076 Aalto, Finland.
authors.forename: Kimmo
authors.initials: K
authors.lastname: Mustonen
authors.forename: Toma
authors.initials: T
authors.lastname: Susi
authors.forename: Antti
authors.initials: A
authors.lastname: Kaskela
authors.forename: Patrik
authors.initials: P
authors.lastname: Laiho
authors.forename: Ying
authors.initials: Y
authors.lastname: Tian
authors.forename: Albert G
authors.initials: AG
authors.lastname: Nasibulin
authors.forename: Esko I
authors.initials: EI
authors.lastname: Kauppinen