Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 45: Joint Poster Session

HL 45.5: Poster

Dienstag, 15. März 2011, 18:00–21:00, P1

Electric field induced exciton and charge transfer dissociation — •Sebastian Schwab¹, Julia Kern¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Faculty of Physics and Astronomy, Julius-Maximilians-University of Würzburg, D-97074 Würzburg — ²ZAE Bayern, Div. Functional Materials for Energy Technology, D-97074 Würzburg

The enormous potential of organic opto--electronic devices such as organic light emitting diodes and solar cells is still limited due to a lack of understanding of underlying processes and energetics. A deeper comprehension of the processes governing exciton and charge transfer dissociation as well as the parameters influencing them is crucial to reduce existing uncertainties. Therefore we studied the field induced quenching of photoluminescence of various materials such as MDMO--PPV. An applied electric field dissociates the singlet respectively charge transfer excitons, generated by laser illumination, into electron--hole pairs which corresponds to a reduction of radiative recombination and therefore of photoluminescence signal. We discussed our experimental results in view of the Braun--Onsager--Model of electric field assisted dissociation.