Elucidating the Role of Molecule-Electrode Interfacial Defects in Charge Tunneling Characteristics of Large-Area Junctions

Gyu Don Kong, Junji Jin, Martin Thuo, Hyunsun Song, Joonyoung F. Joung, Sungnam Park, Hyo Jae Yoon

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Interfacial chemistry at organic-inorganic contact critically determines the function of a wide range of molecular and organic electronic devices and other systems. The chemistry is, however, difficult to understand due to the lack of easily accessible in-operando spectroscopic techniques that permit access to interfacial structure on a molecular scale. Herein, we compare two analogous junctions formed with identical organic thin film and different liquid top-contacts (water droplet vs eutectic gallium indium alloy) and elucidate the puzzling interfacial characteristics. Specifically, we fine-tune the surface topography of the organic surface using mixed self-assembled monolayers (SAMs): single component SAM composed of rectifier (2,2′-bipyridyl-terminated n-undecanethiolate; denoted as SC11BIPY) is systematically diluted with nonrectifying n-alkanethiolates of different lengths (denoted as SCn where n = 8, 10, 12, 14, 16, 18). Characterization of the resulting mixed SAMs in wettability and tunneling currents with the two separate liquid top-contacts allows us to investigate the role of phase segregation and gauche defect in the SAM//liquid interfaces. The results reported here show the difference in length between SC11BIPY and SCn is translated into nanoscopic pits and gauche-conformer defects on the surface, and the difference in contact force - hydrostatic vs user pressures - and hence conformity of contact account for the difference in wettability and rectification behaviors. Our work provides an insight into the role of molecule-electrode interfacial defects in performance of molecular-scale electronic devices.

Original languageEnglish
Pages (from-to)12303-12307
Number of pages5
JournalJournal of the American Chemical Society
Volume140
Issue number38
DOIs
Publication statusPublished - 2018 Sep 26

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Wettability
Self assembled monolayers
Electrodes
Organic Chemistry
Equipment and Supplies
2,2'-Dipyridyl
Defects
Indium
Molecules
Contacts (fluid mechanics)
Wetting
Liquids
Gallium alloys
Indium alloys
Electronic scales
Pressure
Water
Surface topography
Surface chemistry
Eutectics

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Elucidating the Role of Molecule-Electrode Interfacial Defects in Charge Tunneling Characteristics of Large-Area Junctions. / Kong, Gyu Don; Jin, Junji; Thuo, Martin; Song, Hyunsun; Joung, Joonyoung F.; Park, Sungnam; Yoon, Hyo Jae.

In: Journal of the American Chemical Society, Vol. 140, No. 38, 26.09.2018, p. 12303-12307.

Research output: Contribution to journalArticle

Kong, Gyu Don ; Jin, Junji ; Thuo, Martin ; Song, Hyunsun ; Joung, Joonyoung F. ; Park, Sungnam ; Yoon, Hyo Jae. / Elucidating the Role of Molecule-Electrode Interfacial Defects in Charge Tunneling Characteristics of Large-Area Junctions. In: Journal of the American Chemical Society. 2018 ; Vol. 140, No. 38. pp. 12303-12307.
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