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

    Authors

    B. K. Sarker; S. Shekhar;S. I. Khondaker

    Comments

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    Abbreviated Journal Title

    ACS Nano

    Keywords

    semiconducting carbon nanotube; aligned array; solution-processed; dielectrophoresis; transistors; CHEMICAL-VAPOR-DEPOSITION; THIN-FILM TRANSISTORS; DIELECTROPHORESIS; ELECTRONICS; ELECTROKINETICS; PERFORMANCE; FABRICATION; NANOWIRES; SUBSTRATE; NETWORKS; Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &; Nanotechnology; Materials Science, Multidisciplinary

    Abstract

    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.

    Journal Title

    Acs Nano

    Volume

    5

    Issue/Number

    8

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    6297

    Last Page

    6305

    WOS Identifier

    WOS:000294085400027

    ISSN

    1936-0851

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