Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Poster Session 1 (joint session with BP)

CPP 19.51: Poster

Dienstag, 1. April 2014, 09:30–13:00, P1

Influencing optical properties and the morphology in thin polymer films consisting of P3HT, PFO und MEH-PPV by adding small amounts of high-boiling solvent additives — •Markus Reichenberger — Universität Bayreuth, Lehrstuhl EP2

If admixing a few volume percent of higher boiling point additives to a solution with constant polymer concentration and solvent, impact on optical transitions, electronic properties and film morphology is resulting. It is shown how this modification of the polymer solution affects thin films of P3HT. The investigation is carried out by different spectroscopical methods and various techniques of surface analysis. Diiodooctane, dichlorobenzene and octanedithiole are used as exemplary high-boiling additives. The effect of incorporating diiodooctane on films made of PFO and MEH-PPV gives approximately equivalent results as in P3HT films: By admixing a small amount of an arbitrary high boiling point additive to the polymer solution, one can control the fraction of amorphous and aggregated phase, hence potentially the charge transport, in the spin-coated polymer film.

Many a time in the literature one observes an high energetic peak at 2.12 eV, respectively 585 nm, in the photoluminescence spectrum of thin P3HT films. Recent results are able to clarify the origin of this peak.