title: Transparent conductive single-walled carbon nanotube networks with precisely tunable ratios of semiconducting and metallic nanotubes.
abstract: We present a comprehensive study of the optical and electrical properties of transparent conductive films made from precisely tuned ratios of metallic and semiconducting single-wall carbon nanotubes. The conductivity and transparency of the SWNT films are controlled by an interplay between localized and delocalized carriers, as determined by the SWNT electronic structure, tube-tube junctions, and intentional and unintentional redox dopants. The results suggest that the main resistance in the SWNT thin films is the resistance associated with tube-tube junctions. Redox dopants are found to increase the delocalized carrier density and transmission probability through intertube junctions more effectively for semiconductor-enriched films than for metal-enriched films. As a result, redox-doped semiconductor-enriched films are more conductive than either intrinsic or redox-doped metal-enriched films.
authors.affiliation: National Renewable Energy Laboratory, Golden, Colorado 80401, USA. jeffrey_blackburn@nrel.gov
authors.forename: Jeffrey L
authors.initials: JL
authors.lastname: Blackburn
authors.forename: Teresa M
authors.initials: TM
authors.lastname: Barnes
authors.forename: Matthew C
authors.initials: MC
authors.lastname: Beard
authors.forename: Yong-Hyun
authors.initials: YH
authors.lastname: Kim
authors.forename: Robert C
authors.initials: RC
authors.lastname: Tenent
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: McDonald
authors.forename: Bobby
authors.initials: B
authors.lastname: To
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Coutts
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Heben
mesh_terms: D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008670:Metals / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012031:Refractometry; D012666:Semiconductors; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D008670:Metals; D037742:Nanotubes, Carbon