Quantum transport in low-dimensional organic nanostructures

J. G. Park, G. T. Kim, J. H. Park, H. Y. Yu, G. McIntosh, V. Krstic, S. H. Jhang, B. Kim, S. H. Lee, S. W. Lee, M. Burghard, S. Roth, Y. W. Park

Research output: Contribution to journalConference articlepeer-review

26 Citations (Scopus)

Abstract

We have studied three low-dimensional systems with sub-micron dimensions: a single polyacetylene (PA) nanofiber; a single-walled carbon nanotube (SWNT)-rope; and a lithographically prepared stripe of poly(2-methoxy-5-(2-ethyl hexyloxy)-p-phenylene vinylene) (MEH-PPV). In each case, the sample was contacted to four-probe electrodes, with 100-nm spacing and various electronic transport properties such as the I-V characteristics, the temperature dependence of resistivity and the gate voltage dependence of the transport current were measured. The PA nanofiber was found to be non-ohmic with a room temperature conductivity of ∼0.1 S/cm. Its carriers were found to be hole-like with charge carrier mobility of μ = 7.76 × 10-2 cm2/Vs. For the SWNT-rope, the temperature-dependence of resistivity exhibited signatures of a Luttinger liquid for temperatures below 30 K. With varying gate voltage, periodic peaks were seen in the nanotube current which would normally be attributed to the effects of Coulomb blockade. Interestingly, these peaks show three-way splitting, similar to observations in triple quantum dot experiments. The MEH-PPV stripe, which was produced using electron beam lithography, had I-V characteristics similar to that of a large band-gap semiconductor. In the high field region, these characteristics could be explained in terms of a single carrier device model which considers the field-dependent mobility along with space charge limited conduction (SCLC). All three samples can be considered as field-effect transistors (FETs), with potential use in future high density integrated electronic devices.

Original languageEnglish
Pages (from-to)161-167
Number of pages7
JournalThin Solid Films
Volume393
Issue number1-2
DOIs
Publication statusPublished - 2001 Aug 1
Externally publishedYes
Event4th International Conference on Nano-Molecular Electronics - Kobe, Japan
Duration: 2000 Dec 52000 Dec 7

Keywords

  • Electrical transport
  • FET
  • MEH-PPV
  • Nanotube
  • Polyacetylene

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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