Dresden 2006 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

CPP: Chemische Physik und Polymerphysik

CPP 23: POSTER Functional Organic Thin Films

CPP 23.39: Poster

Donnerstag, 30. März 2006, 17:00–19:00, P2

Pump-probe spectroscopy of organic semiconductor-heterosystems — •R. Nüske, E. Engel, K. Leo, and M. Hoffmann — Institut für Angewandte Photophysik, TU Dresden, 01062 Dresden, Germany, www.iapp.de

The transport properties of photo-generated excitons in organic semiconductors are important parameters for the development of optoelectronic devices. We investigate double-layer systems with thin films of PTCDA (perylene-3,4,9,10-tetracarboxylic-dianhydride) and TiOPc (titanyl-phthalocyanine). Excitons generated in PTCDA are transferred by diffusion or Förster transfer to TiOPc. A femtosecond white-light continuum is used to record transient absorption spectra in the range between 1.2 eV and 2.6 eV. From the dynamics of the transient spectra, we infer the transfer rates of excitons from PTCDA to TiOPc. These rates are in accordance with luminescence quenching experiments reported recently [1].

[1] R.Schüppel et al., J.Lumin. 110, 309 (2004).