Regensburg 2004 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 16: POSTER: Computational Physics, Complex Systems

CPP 16.6: Poster

Dienstag, 9. März 2004, 17:00–19:00, B

Photogeneration of charge carriers in blends of conjugated polymers and semiconducing nanoparticles — •Johannes Sieger¹, Michael Pientka¹, Jürgen Parisi¹, Vladimir Dyakonov¹, Andrey Rogach², Dimitri Talapin³, and Horst Weller³ — ¹Institute of Physics, Energy and Semiconductor Research, University of Oldenburg, 26111 Oldenburg, Germany — ²LMU Munich, Photonics and Optoelectronics, 80799 Munich — ³Physical Chemistry, University of Hamburg, 20146 Hamburg

We investigated photoinduced charge transfer reactions in blends of CdSe, InP nanoparticles with conjugated polymer OC₁C₁₀-PPV. The particle size was in the range 3.1nm-4.1nm. They were capped with a HDA-TOPO TOP shell and pyridine washed. Photoinduced absorption spectroscopy (PIA) reveals structured features which are attributed to photoexcited polaronic states on the polymer chain. Additionally the photoluminescence in the blends is strongly quenched. We find a broad distribution of lifetimes and a nearly square root behaviour in the laser intensity dependence which altogether is characteristic for dispersive recombination. The temperature dependence of the PIA signal shows an unusual increase from low temperature up to 300K. By applying light induced electron spin resonance the charge transfer process between the polymer and the nanoparticles is confirmed by determining the g- factor of the polaronic anion of the polymer.