Electrical conduction through self-assembled monolayers in molecular junctions: Au/molecules/Au versus Au/molecule/PEDOT:PSS/Au

Gunuk Wang, Hana Yoo, Seok In Na, Tae Wook Kim, Byungjin Cho, Dong Yu Kim, Takhee Lee

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We fabricated and characterized a large number of octanedithiol (denoted as DC8) molecular devices as vertical metal-molecule-metal structure with or without using an intermediate conducting polymer layer of poly (3,4-ethylenedioxythiophene) stabilized with poly(4-styenesulfonic acid) (called as PEDOT:PSS). The electronic transport properties of DC8 molecular devices with and without PEDOT:PSS layer were statistically compared in terms of current density and device yield. The yields of the working molecular devices were found to be ~ 1.75% (84 out of 4800 devices) for Au/DC8/Au junctions and ~ 58% (74 out of 128 devices) for Au-DC8/PEDOT:PSS/Au junctions. The tunneling decay constants were obtained with the Simmons tunneling model and a multibarrier tunneling model for two kinds of molecular devices with and without PEDOT:PSS layer.

Original languageEnglish
Pages (from-to)824-828
Number of pages5
JournalThin Solid Films
Volume518
Issue number2
DOIs
Publication statusPublished - 2009 Nov 30

Keywords

  • Molecular junction
  • Octanedithiol
  • Self-assembled monolayer
  • Transport mechanism

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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