Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 56: Organic-Inorganic Systems III: Electronic Structure (organized by O)
CPP 56.9: Vortrag
Donnerstag, 10. März 2016, 17:15–17:30, S051
Theory of excitation transfer in hybrid inorganic/organic systems: Coulomb transfer between semiconductor and molecular layers — •Judith Specht1, Eike Verdenhalven1, Sverre Theuerholz1, Andreas Knorr1, Marten Richter1, Bjoern Bieniek2, and Patrick Rinke2,3 — 1Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Berlin, Germany — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 3Aalto University, Aalto, Finland
Hybrid inorganic/organic systems form a novel class of composite materials with interesting optoelectronic properties. Due to the Coulomb interaction, Wannier-exciton like states in an inorganic semiconductor nanostructure are coupled to Frenkel excitons occurring in organic materials. The considered structure consists of a thin, highly ordered molecular film adsorbed on a semiconductor quantum well. Based on a density matrix theory, we study the Förster-type non-radiative excitation transfer across the hybrid interface. The microscopic input parameters are taken from ab initio caculations for ladder-type quarterphenyl (L4P) molecules on the ZnO(1010) surface [1]. As a consequence of microscopic momentum selection rules, the coupling strength between the two constituents varies for different coverage densities of the semiconductor surface with molecules.Our findings can be used for optimizing the energy transfer efficiency by modifying the geometry of the hybrid structure.
[1] Verdenhalven et al., Phys. Rev. B 89, 235314 (2014).