Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Poster: Organic Electronics and Photovoltaics

CPP 27.18: Poster

Mittwoch, 24. März 2010, 17:30–19:00, Poster C

Morphological degradation of fullerene polymer solar cells — •Vida Turkovic, Chetan Raj Singh, Sebastian Engmann, Maik Bärenklau, Roland Röschi, Gerhard Gobsch, and Harald Hoppe — Ilmenau University of Technology, Weimarer Straße 32, Ilmenau 98693

Typical acceptor materials such as fullerene derivates tend to diffuse and finally agglomerate in blends with polymeric donors, depending on the chemical structure of the donor. This process eventually leads to a morphological destruction of the organic solar cells. The changes in the blend morphology of the thin films accelerate when thermally annealed at increased temperatures. Tapping-mode atomic force microscopy (AFM) measurements provide deeper insight into the nano and micrometer scale of the phase separation observable on the surface of the film. Furthermore, to prove the coarsening of phase separation on various length scales, optical microscopy, UV-Vis, photoluminescence and spectral ellipsometry measurements were conducted. Of special interest is tracking down the formation of fullerene aggregates and correlation of their growth in time.