Study on the Mechanism of Charge Tunneling and Hopping Transport in Ferrocene Self-Assembled Molecular Junctions†

doi:10.7503/cjcu20180629

Abstract

Abstract:

The charge transport properties of non-electroactive 1-undecanethiol(C11) and electroactive 6-(ferrocenyl) hexanethiol(FHT) molecular junctions using thiol self-assembled monolayer combined with suspended nanowires technology were compared and studied. Combining the two transmission mechanisms, a new model was proposed to fit the current-voltage characteristics of the molecular junction. It is found that the FHT of redox active center molecule can change the charge transport from tunneling to tunneling-hopping coexistence mechanism. This mechanism was verified in combination with variable temperature experiment, and the possible reasons for this mixing process was explained.

Key words: Molecular electronics, Molecular junction, Charge transport, Tunneling and hopping mechanism

CLC Number:

O641

TrendMD:

HAN Bin,YU Xi,HU Wenping. Study on the Mechanism of Charge Tunneling and Hopping Transport in Ferrocene Self-Assembled Molecular Junctions^†[J]. Chem. J. Chinese Universities, 2019, 40(2): 298.

Figures/Tables 10

Fig.1 Diagram of molecular junction device based on FHT molecules and enlarged view of a molecular junction

Fig.2 SEM images of gold nanowires(A) Side view; (B) enlarged view.

Fig.3 Thickness of SAM(A), infrared spectrum of FHT(a) and C11(b) SAM(B)

Fig.4 I-V curves of FHT and C11 molecular junctions(A) I-V in linear scale, the inset is an enlarged view of the C11 molecular junction; (B) the logarithmic I-V curves; the error bars represent the distribution range of the average values.

Fig.5 Diagram of charge transport of tunneling mechanism(A) and hopping mechanism(B)

Fig.6 Plot of the C11 I-V curves fitted by tunneling model

Fig.7 Temperature dependent I-V curves for the C11 molecular junction(A) Logarithmic plot of I-V curves; (B) Arrhenius curves.

Fig.8 Plot of the FHT I-V curves fitted by different models(A) Tunneling model fitting; (B) hopping model fitting; (C) tunneling and hopping mixed model fitting; (D) tunneling and hopping mechanism component analysis in the fitting result of the mixed model.

Fig.9 Temperature dependent I-V curves for the FHT molecular junction(A) Logarithmic plot of I-V curves; (B) Arrhenius curves.

Fig.10 Two-channel model mechanism diagram of FHTⅠ: Tunneling; Ⅱ: hopping.

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