2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Transparent, Conductive and Flexible Carbon Nanotube Films and Their Application in Organic Light Emitting Diodes

C. Zhou
University of Southern California, US

Keywords:
nanotube, film, oled

Abstract:
Pioneering work has been performed by Zhang et al. on using multi-walled nanotube films as electrodes for OLED devices. In addition, high-quality single-walled nanotube (SWNT) films have been produced using nanotubes synthesized via laser ablation. Here, we report on comparative studies on transparent conductive thin films and also OLED devices made with two kinds of commercial SWNTs: HiPCO nanotubes and arc-discharge nanotubes. This choice of materials is based on the fact that HiPCO and arc-discharge nanotubes are currently the only two SWNT products commercially available in bulk quantities. Systematic investigation of their transparent networks can therefore provide practical information to interdisciplinary research on carbon nanotubes and organic displays. Our control experiments demonstrate that arc-discharge nanotubes form far more homogeneous and conductive networks than HiPCO nanotubes, and result in OLEDs with longer lifetimes when serving as the hole-injection electrodes . We have also performed polymer passivation and SOCl2 doping to further reduce the surface roughness and sheet conductance of the SWNT films . The optimized films show typical sheet resistance of ~160 /, 87% transparency, and surface roughness comparable to that of ITO substrates.

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Nanotech 2007 Conference Program Abstract

 
 

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