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Single electron transistor with a single conjugated molecule
Sergey Kubatkin,Andrey Danilov,jean-Luc Br?as,Thomas Bj?nholm,Mattias Hjort,Jerome Cornil,Nicolai Stuhr-Hansen,Per Hedeg?d 한국물리학회 2004 Current Applied Physics Vol.4 No.5
We report on a single electron transistor (SET) where the electronic levels of a singlep-conjugated molecule control the electron transport properties. The molecule can be in several distinct charged states from +3 to)4. The experiment closely resembles electrochemical measurements allowing us to report on quantitative measurements of the redox potentials (or ionization potentials)of a single molecule in a solid state device. The molecular excitation energies extracted from the SET measurements are strongly correlated with electrochemical data. In contrast, the HOMOLUMO gap is strongly reduced in a solid state environment, ascompared to solution. We suggest that this surprising eect may be caused by image charges generated in the source and drain electrodes. They will result in a strong localization of the charges on the molecule.