Ambipolar transport in an electrochemically gated single-molecule field-effect transistor

Ismael Díez-Pérez, Zhihai Li, Shaoyin Guo, Christopher Madden, Helin Huang, Yanke Che, Xiaomei Yang, Ling Zang, Nongjian Tao

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Charge transport is studied in single-molecule junctions formed with a 1,7-pyrrolidine-substituted 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) molecular block using an electrochemical gate. Compared to an unsubstituted-PTCDI block, spectroscopic and electrochemical measurements indicate a reduction in the highest occupied (HOMO)-lowest unoccupied (LUMO) molecular orbital energy gap associated with the electron donor character of the substituents. The small HOMO-LUMO energy gap allows for switching between electron- and hole-dominated charge transports as a function of gate voltage, thus demonstrating a single-molecule ambipolar field-effect transistor. Both the unsubstituted and substituted molecules display similar n-type behaviors, indicating that they share the same n-type conduction mechanism. However, the substituted-PTCDI block shows a peak in the source-drain current vs gate voltage characteristics for the p-type transport, which is attributed to a two-step incoherent transport via the HOMO of the molecule.

Original languageEnglish (US)
Pages (from-to)7044-7052
Number of pages9
JournalACS Nano
Volume6
Issue number8
DOIs
StatePublished - Aug 28 2012

Fingerprint

Field effect transistors
field effect transistors
Molecules
Charge transfer
molecules
Energy gap
Electrons
Drain current
Electric potential
electric potential
Molecular orbitals
molecular orbitals
electrons
conduction
perylenetetracarboxylic diimide

Keywords

  • ambipolar FET
  • electrochemical gate
  • PTCDI
  • single-molecule junction
  • STM

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Ambipolar transport in an electrochemically gated single-molecule field-effect transistor. / Díez-Pérez, Ismael; Li, Zhihai; Guo, Shaoyin; Madden, Christopher; Huang, Helin; Che, Yanke; Yang, Xiaomei; Zang, Ling; Tao, Nongjian.

In: ACS Nano, Vol. 6, No. 8, 28.08.2012, p. 7044-7052.

Research output: Contribution to journalArticle

Díez-Pérez, I, Li, Z, Guo, S, Madden, C, Huang, H, Che, Y, Yang, X, Zang, L & Tao, N 2012, 'Ambipolar transport in an electrochemically gated single-molecule field-effect transistor', ACS Nano, vol. 6, no. 8, pp. 7044-7052. https://doi.org/10.1021/nn302090t
Díez-Pérez I, Li Z, Guo S, Madden C, Huang H, Che Y et al. Ambipolar transport in an electrochemically gated single-molecule field-effect transistor. ACS Nano. 2012 Aug 28;6(8):7044-7052. https://doi.org/10.1021/nn302090t
Díez-Pérez, Ismael ; Li, Zhihai ; Guo, Shaoyin ; Madden, Christopher ; Huang, Helin ; Che, Yanke ; Yang, Xiaomei ; Zang, Ling ; Tao, Nongjian. / Ambipolar transport in an electrochemically gated single-molecule field-effect transistor. In: ACS Nano. 2012 ; Vol. 6, No. 8. pp. 7044-7052.
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