Excitons in Organic Superlattices

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Abstract
We discuss the properties of electronic excitations in organic structures appearing in the transition from monolayers to bilayers, trilayers and so on to superlattices. In such media the possibility to govern spectra of electronic excitation of interfaces is promising. We consider the main interactions which determine these spectra and show that, since in organic media, as a rule, excitons of small radius (Frenkel and charge transfer excitons) occur, the creation of a new class of structures in which the formation of spatially separated Frenkel and charge transfer excitons can be possible. In such structures the unusual channels of photo- as well as photo-electrical transformation are of interest. In a talk we touch upon the superradiance of two-dimensional excitons and biexcitons and also the theory of optical properties of short- and long-period organic superlattices including their properties under the influence of external fields.