MSC Colloquium J.-P. Bourgoin
|04 november 2004||FWN-Building 5111.0080, Nijenborgh 4, 9747 AG, Groningen|
|Affiliation:||Laboratoire d'Electronique Moléculaire, CEA Saclay, 91191 Gif/Yvette, France|
|Title:||Engineering molecules-surfaces interactions for molecular electronics|
|Date:||Thu Nov 4, 2004|
|Start:||16.00 (Doors open and coffee available at 15.30)|
During the last five years, Molecular Electronics has seen very significant advances and raised prospects of mid-term applications1,2. In this talk, the focus will be on self-assembly which is generally considered as the way of choice for the fabrication of future molecular electronics circuits. Self-assembling molecules into devices has been used during the last few years with the aim to engineer :
i) metal-molecule or more generally metal-nanoobjects interfaces to improve their transport properties and
ii) molecule-surface interactions to localize the self-assembly of the nanoobjects.
In this lecture, I will focus on recent results developed in the LEM along these two axis. I will first discuss the relationship between the molecular structure and the transport properties and show that the metal - molecule coupling plays a key role3. I will illustrate this based on combined Photoelectron Spectroscopy-STM experiments where similar conjugated molecules with different end-groups have been systematically compared.
In a second part, it will be shown how carbon nanotubes(NTs) can be self-assembled at predefined location of a substrate using for example a localized functionalization of the substrate by a self-assembled monolayer4. Various examples of the versatility of this generic technique will be presented including the fabrication of single electron transistors, of junctions, of field effect transistors (FET). For example, the FET devices prepared in that way are functional with state-of-the-art performances5. The role played by the environment (including that of the self-assembled monolayer directing the deposition of the NTs and that of molecules adsorbed on the NTs) on the devices characteristics will be discussed. It will be shown in particular how a chemical treatment of the devices can be used to improve drastically the performances of the carbon nanotube FET6. In addition, further elaborating upon the chemical tailoring of the CNTFET devices, a new class of devices consisting of optically gated CNTFET has been developed and will be presented.
As another example of application of this self-assembling technique, new nano electromechanical systems based on nanotubes will be presented and shown to function as switches.
Finally, the improvements of the self-assembling technique using the recognition properties of biomolecules will be presented.
With the collaboration of S. Auvray, J. Borghetti, P. Chenevier, V. Derycke, A. Filoramo, L. Goux-Capes, M. Goffman, A. Isambert, R. Lefevre, K. Nguyen, S. Palacin, L. Patrone
1. A. Nitzan and M. Ratner, Science 300 (2003) 1384
2. J. Heath and M. Ratner, Physics Today (2003) 43
3. L. Patrone, F. Armand, S. Palacin, J. Charlier, J. Lagoute, T. Zambelli, S. Gauthier, H. Tang, J. Bourgoin Physical Review Letter 91(9) (2003) 960802
4. K. Choi, J. Bourgoin, S. Auvray, D. Esteve, G. S. Duesberg, S. Roth and M. Burghard, Surface Science 462, 195 (2000)
5. E. Valentin, S. Auvray, J. Goethals, J. Lewenstein, L. Capes, A. Filoramo, A. Ribayrol, R. Tsui, J. Bourgoin, J. Patillon, Microelectronic engineering 61-62, 491 (2002).
6. S. Auvray et al., Applied Physics Letters June 12 2
|Laatst gewijzigd:||22 oktober 2012 14:30|