Charge Carrier Mobility in Films of Carbon-Nanotube-Polymer Composites

Abstract

Charge carrier mobility in thin films of composites of single wall carbon nanotubes and poly-N-vinylcarbazole in the range of nanotube concentrations below that of the percolation threshold is studied. The drift mobility of electrons is found to range between (1.2–4.5) × 10⁻⁶ cm²/(V s), which is by a factor of 5 higher than that for holes. The polymer is shown to provide the electron and hole transport in composite films.

Keywords:

• carbon nanotubes
• charge mobility
• polymer film

Acknowledgments

We are grateful to R. W. Rychwalski and L. Licea-Jiménez (Chalmers University of Technology, Sweden) for providing purified SWCNT and J. D. White (Yuan Ze University, Taiwan) for the discussion. The work was supported by the ISTC project 3718 and RFBR projects 07-03-00149, 07-03-92112 and 08-03-00125.