Plastic electronics

Summary form only given. Plastic electronics is a rapidly growing activity owing to the big economic impact expected from the new generation of organic electroluminescent screens. We have specialized in Angers into some aspects of the technology, which promises great technological development although still demanding fundamental and technological research: plastic solar cells, organic lasers, field effect transistors. The analysis of the problem requires in each situation a multiscale approach. I will illustrate in detail this multiscale approach in the case of plastic solar cells in which each basic process appears to be associated with a particular scale which is almost the range of the interaction: absorption, exciton diffusion, charge transfer, charge transport, electric properties. This approach permits to define the limits of the process and also the direction in which we can expect improvement of the devices. Our today´s devices reach 1% solar power efficiency in bilayer structures, 2% efficiency with co-deposited molecules and 3% efficiency with polymer blends.