Luis A. Cardenas

Post Doctoral Fellow

Université du Québec
Institut national de la recherche scientifique
Énergie, Matériaux et Télécommunications
1650, boulevard Lionel-Boulet
Varennes, Québec, Canada
J3X 1S2

Telephone: +1 (450) 929-8001
Fax: +1 (450) 929-8102
cardenas@emt.inrs.ca
www.emt.inrs.ca

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The p-conjugated semiconductor structures (polymers) present a growing interest in particular in the field of communication and information technologies. Organic Field-effect Transistors (OFET), light-emitting diodes, and solar batteries are possible applications for these organic semiconductors. One of the key points to reach high performances with such devices using conjugated polymers is the elaboration of highly organized structures on surfaces on the single-molecular scale. Most of the studies about surface polymerization have been performed on conducting substrates. Playing with the organic films composition, the strength of the interaction with the substrate and the exposition of thin films to additional chemical species will give the opportunity to tune the physical properties of organic materials for applications in nanoelectronics. The specific goal of my proposed research is to study the mechanism of molecular (polymer) adsorption on metallic substrates and determine the structural and electronic properties of molecular self-organized. The development of this project will require the use of surfaces science techniques (MBE growth, STM, LEED/Auger and photoemission spectroscopy).

List of publications:
L.A. Cardenas, Y. Fagot-Revurat, L. Moreau, B. Kierren and D. Malterre, “Surface-state bipolaron formation on a triangular lattice in the sp-type alkali/Si(111) Mott insulator”, Phys. Rev. Lett. 103, 046804 (2009).

L.A. Cardenas, Y. Fagot-Revurat L. Moreau, B. Kierren, and D. Malterre, “Novel bi-polaronic ground state in K/Si(111):B”; e-J. Surf. Sci. Nanotech. Vol. 7 (2009) 259-263.

C. Tournier-Colletta, L.A. Cardenas, Y. Fagot-Revurat, B. Kierren, D. Malterre, “Spectral function of the K/Si(111) : B surface state: the bipolaronic CDW scenario”. To be published in J. Elec. Spec.

L.A. Cardenass, Y. Fagot-Revurat, B. Kierren, D. Malterre, C. Didiot, P. Aebi. “Determination of the adsorption sites of alkali on the Si(111)(?3x?3)R30° : B surface structure by dynamical LEED”. To be published in Surf. Sci.

L.A. Cardenas, A. Rodriguez, F. Rueda, R. Casanova, A. Loaiza, “Oxygen and Hydrogen Adsorption studies by means of the Kelvin probe”; Latin American review of metallurgy and materials. 24 (2006).