Exchanging energy, orders or information with a molecule require a specific fabrication technology to master the detail interactions of a single molecule with a few electrodes, tip apex or a dielectric wave guides. In most of the case the interaction must be master with a length scale well below 0.1 nm that is at the atomic scale. This is for example the case of the electronic interaction between a molecular wire and its interconnection pads. Here, the overlap between the molecular orbital of the end group of the molecule dedicated to the contact and the surface orbital at the end of the pad will vary exponentially with distance in the 0.05nm range. At the same time any atomic defects or disorder at the end of the electrode will modify this overlap and consequently the contact conductance of the molecular wire. This is also the case in molecular mechanics. When a molecule explores a surface, its legs, wheels…are adsorbed on the surface. Any atomic defect or atomic steps meet along the surface by the itinerant molecule will influence its intramolecular mechanics. So an extreme care must be taken in the preparation of the surface, in the construction of the contacting electrodes, of the tip apex… Many of the now standard nano-lithography techniques like e-beam or nano-imprint are not compatible with those extreme cleanness requirements at the surface of a solid to construct atomically precise interconnects. The GNS has launch a large instrumentation and surface science program for the development of a new atom technology, sometimes called “picotechnology”, expending “nanotechnology” deep in the bottom.
- Photo prise à l’extérieur de la chambre UHV de la micro salle blanche
- © CEMES-CNRS
FIB- Erik Dujardin