Influence of halogen substitutions on rates of charge tunneling across SAM-based large-area junctions

Gyu Don Kong, Miso Kim, Hyeon Jae Jang, Kung Ching Liao, Hyo Jae Yoon

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10 Citations (Scopus)


This paper examines the ability of structural modifications using halogen atoms (F, Cl, Br, and I) to influence tunneling rates across self-assembled monolayer (SAM)-based junctions having the structure Ag<sup>TS</sup>/S(CH<inf>2</inf>)<inf>n</inf>(p-C<inf>6</inf>H<inf>4</inf>X)//Ga<inf>2</inf>O<inf>3</inf>/EGaIn, where S(CH<inf>2</inf>)<inf>n</inf>(p-C<inf>6</inf>H<inf>4</inf>X) is a SAM of benzenethiol (n = 0) or benzyl mercaptan (n = 1) terminated in a hydrogen (X = H) or a halogen (X = F, Cl, Br, or I) at the para-position. The measured tunneling current densities (J(V); A cm<sup>-2</sup>) indicate that replacing a terminal hydrogen with a halogen atom at the X//Ga<inf>2</inf>O<inf>3</inf> interface leads to a decrease in J(V) by ∼×13 for S(p-C<inf>6</inf>H<inf>4</inf>X) and by ∼×50 for SCH<inf>2</inf>(p-C<inf>6</inf>H<inf>4</inf>X). Values of J(V) for the series of halogenated SAMs were indistinguishable, indicating that changes in dipole moment and polarizability caused by introducing different halogen atoms at the interface between the SAM and the Ga<inf>2</inf>O<inf>3</inf>/EGaIn electrode do not significantly influence the rates of charge tunneling across the junctions.

Original languageEnglish
Pages (from-to)13804-13807
Number of pages4
JournalPhysical Chemistry Chemical Physics
Issue number21
Publication statusPublished - 2015 Jun 7

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

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