Resonant transport in a highly conducting single molecular junction via metal-metal covalent bond
| Autor: | Pabi, Biswajit, Marek, Štepán, Pal, Adwitiya, Kumari, Puja, Ray, Soumya Jyoti, Thakur, Arunabha, Korytár, Richard, Pal, Atindra Nath |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Nanoscale (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1039/D3NR02585C |
| Popis: | Achieving highly transmitting molecular junctions through resonant transport at low bias is key to the next-generation low-power molecular devices. Although, resonant transport in molecular junctions was observed by connecting a molecule between the metal electrodes via chemical anchors by applying a high source-drain bias (> 1V), the conductance was limited to < 0.1 G$_0$, G$_0$ being the quantum of conductance. Here, we report electronic transport measurements by directly connecting a Ferrocene molecule between Au electrodes at the ambient condition in a mechanically controllable break junction setup (MCBJ), revealing a conductance peak at ~ 0.2 G$_0$ in the conductance histogram. A similar experiment was repeated for Ferrocene terminated with amine (-NH2) and cyano (-CN) anchors, where conductance histograms exhibit an extended low conductance feature including the sharp high conductance peak, similar to pristine ferrocene. Statistical analysis of the data along with density functional theory-based transport calculation suggests the possible molecular conformation with a strong hybridization between the Au electrodes and Fe atom of Ferrocene molecule is responsible for a near-perfect transmission in the vicinity of the Fermi energy, leading to the resonant transport at a small applied bias (< 0.5V). Moreover, calculations including Van der Waals/dispersion corrections reveal a covalent like organometallic bonding between Au and the central Fe atom of Ferrocene, having bond energies of ~ 660 meV. Overall, our study not only demonstrates the realization of an air-stable highly transmitting molecular junction, but also provides an important insight about the nature of chemical bonding at the metal/organo-metallic interface. Comment: 23 pages, 6 figures, supplementary included |
| Databáze: | arXiv |
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