Electron transport through single alkane molecules with different contact geometries on gold
| Autor: | Myeong H. Lee, Otto F. Sankey, Gil Speyer |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Electron mobility
Chemistry Fermi level Conductance Nanotechnology Condensed Matter Physics Molecular physics Electronic Optical and Magnetic Materials law.invention Metal Protein filament symbols.namesake Electrical resistivity and conductivity law visual_art Density of states visual_art.visual_art_medium symbols Scanning tunneling microscope |
| Zdroj: | physica status solidi (b). 243:2021-2029 |
| ISSN: | 1521-3951 0370-1972 |
| Popis: | We report theoretical simulations of the effects of different binding sites and metal contact geometries on the conductance through single alkanedithiol molecules on gold. Examined are the current-voltage (I- V) characteristics and the projected density of states when a one-atom-thick filament is formed at the molecule-metal interface. Filaments similar to these are believed to be formed in gold STM break-junction experiments. I- V characteristics with these contacts are compared to those of planar gold contacts at hollow or on-top sites. The results reveal that a gold filament contact produces a large change in the Fermi level lineup which significantly affects its I-V curve. The conductance decreases by a factor of 4 ∼ 6 when gold atoms are placed between the molecule and the gold surface to form a filament, and non-linearities develop. The hollow and on-top planar contacts show similar conductivities to each other and produce linear I-V curve. |
| Databáze: | OpenAIRE |
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