Title

Semiconducting Enriched Carbon Nanotube Aligned Arrays Of Tunable Density And Their Electrical Transport Properties

Keywords

aligned array; dielectrophoresis; semiconducting carbon nanotube; solution-processed; transistors

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 can control the linear density of the s-SWNTs in the array from 1/μm to 25/μm. 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 μA/μm, on-conductance was 390 μS, and sheet resistance was 30 kΩ/□. These values are the best reported so far for any semiconducting nanotube array. © 2011 American Chemical Society.

Publication Date

8-23-2011

Publication Title

ACS Nano

Volume

5

Issue

8

Number of Pages

6297-6305

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/nn201314t

Socpus ID

80052072475 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/80052072475

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