Regensburg 2010 – scientific programme
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DS: Fachverband Dünne Schichten
DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,
DS 29.38: Poster
Wednesday, March 24, 2010, 15:00–17:30, Poster A
In-situ AFM study of P3HT:PCBM mixtures during thermal annealing — •Abel Roigé1, J. Oriol Ossó1, Malte Schmidt2, and Mariano Campoy-Quiles2 — 1MATGAS 2000 AIE, Campus de la UAB — 2Institut de Ciència de Materials de Barcelona, CSIC
Polymer-small molecule donor-acceptor blends are currently being extensively investigated due to their use as photovoltaic materials. Post-deposition annealing treatments have proven to be one of the most effective methods to enhance organic solar cell performance. One of the main changes experienced by the materials during heating is the self-assembly of polymer chains which induces an increase in charge transport and light absorption. However, the particular changes and concomitant device improvements strongly depend on the specific processing conditions. It is, thus, clear, that novel ways of monitoring the morphological changes associated to these treatments can be strongly beneficial for the optimization of organic solar cells. In this work, we use in-situ AFM measurements to detect changes in topography and surface roughness upon heating for the workhorse material system (P3HT:PCBM). These measurements allow to visualize the polymer crystallization at 140∘C as well as a clear decrease in roughness at around 100∘C. In addition, in-situ Raman spectroscopy experiments and conductive AFM complement real time topographical data to detect the structural changes that occur during annealing and their effect on the electric transport properties. The combination of these techniques allows a detailed characterization of the morphological changes that organic materials undergo during thermal annealing.