Semiconducting Enriched Carbon Nanotube Aligned Arrays of Tunable Density and Their Electrical Transport Properties

We demonstrate assembly of solution-processed semiconducting enriched (99%) single-walled carbon nanotubes (s-SWNTs) In an array with varying linear density via ac dielectrophoresis (DEP) and investigate detailed electronic transport properties of the fabricated. devices. We show that (I) the quality of the alignment varies with frequency of the applied voltage and that (ii) by varying the frequency and concentration of the solution, we control the linear density of the s-SWNTs In the array from 1/mu m to 25/mu m. The DEP assembled s-SWNT devices provide the opportunity to Investigate the transport property of the arrays. In the direct transport regime. Room temperature electron transport measurements of the, fabricated, devices show that with increasing nanotube density the device mobility increases while the current on-off ratio decreases dramatically. For the dense. array, the device current density was 16 mu A/mu m, on-conductance was, 390 mu S, and sheet resistance was 30 k Omega/square. These values are the best reported so far for any semiconducting nanotube array.