Transparent Conductive Single-Walled Carbon Nanotube Networks with Precisely Tunable Ratios of Semiconducting and Metallic Nanaotubes

Jeffrey L. Blackburn, Teresa M. Barnes, Matthew C. Beard, Yong Hyun Kim, Robert C. Tenent, Timothy J. McDonald, Bobby To, Timothy J. Coutts, Michael J. Heben

Research output: Contribution to journalArticlepeer-review

306 Scopus Citations

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.

Original languageAmerican English
Pages (from-to)1266-1274
Number of pages9
JournalACS Nano
Volume2
Issue number6
DOIs
StatePublished - Jun 2008

NREL Publication Number

  • NREL/JA-590-43237

Keywords

  • Carbon nanotubes
  • Conductivity
  • Doping
  • Electrical properties
  • Optical properties
  • Photovoltaic
  • Separation
  • Thin films

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