Utilizing Nearest-Neighbor Interactions To Alter Charge Transport Mechanisms in Molecular Assemblies of Porphyrins on Surfaces
| Autor: | James D. Batteas, James G. Kushmerick, Charles Michael Drain, Bradley W. Ewers, Lisa M. Pérez, João P. C. Tomé, Amanda E. Schuckman, Lam H. Yu |
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| Rok vydání: | 2015 |
| Předmět: |
Molecular junction
Chemistry Nanotechnology Charge (physics) Decoupling (cosmology) Conductivity Surfaces Coatings and Films Electronic Optical and Magnetic Materials k-nearest neighbors algorithm Delocalized electron General Energy Chemical physics Molecule Physical and Theoretical Chemistry Quantum tunnelling |
| Zdroj: | The Journal of Physical Chemistry C. 119:13569-13579 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.5b01223 |
| Popis: | When tunneling is the dominant mechanism of charge transport in a molecular junction, the conductivity of the junction is largely insensitive to chemical and structural perturbations which do not impact the overall length of the junction. This severely hampers the seemingly limitless potential of molecules to modulate charge transport at interfaces and their application in a host of device designs. This is a particular challenge for molecules baring insulating features like saturated hydrocarbons which decouple functional groups from the surface. Such decoupling groups increase the energy required to isolate charge on the molecule, pushing transport into the tunneling regime in many cases. Herein, we demonstrate that, through enhancement of nearest neighbor interactions, lateral delocalization of charge states in molecular islands can be used to shift transport out of the tunneling regime to the more efficient, and more chemically tunable, charge-hopping regime. In a previous study, it was found that thro... |
| Databáze: | OpenAIRE |
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