Caractérisation Dynamique des pièges aux Interfaces diélectriques/Semi-Conducteurs Organiques. Application aux polymères obtenus par Métathèse. – CADISCOM

The project will explore the frontier of knowledge by addressing microscopic physical and chemical phenomena at dielectric/organic interfaces, which determine the electronic behavior of OFETs. Few examples are ' orders-of-magnitude effect of the gate dielectric on the carrier mobility ' uncontrolled trapping of carriers due to specific chemical groups at the insulator surface The importance of these phenomena has been fully appreciated only very recently and the microscopic mechanisms responsible for their occurrence are unknown. They limit the performance of currently mass-produced OFETs. Through their understanding, the project will contribute to: ' generate fundamental knowledge on molecular multifunctional material and their interfacial electronic properties ' put technology in the field of plastic electronics on a firm scientific basis as it is fundamentally needed for a sustainable long-term development. ' establish the link between fundamental investigations and OFET device applications The research proposed is highly original. The influence of the gate insulator on the mobility of carriers at the dielectric/organic interface has been demonstrated recently. The intrinsic and extrinsic physical and chemical mechanisms responsible for these phenomena are not known. This project will thus focus on recently highlighted problems whose solution is needed to support long-term innovation in the field of plastic electronics. The targets of the proposed activity are well beyond the current frontier of knowledge. The identification of the dielectric/organic interface (as opposed to the organic material itself) as the sub-unit determining the characteristics of OFETs is a conceptual breakthrough, whose consequences will be explored in this project. Many aspects of the experimental techniques and material systems that will be used to investigate dielectric/organic and metal/organic interfaces are also new and put in an original perspective. In particular, our work will involve - new dynamic characterization of OFET performances, - new and powerful dielectric/organic defect characterization techniques, - nano-structured monomolecular layer organic insulators - new synthesis route (metathesis) for the development of new organic semiconductors