Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: Poster: Organic Electronics and Photovoltaics

CPP 30.6: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster B2

Degradation processes in high-efficiency polymer solar cells — •Christoph Senfter, Franziska Löhrer, Christoph Schaffer, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching, Germany

The application of polymers as active material in solar cells has several advantages over conventional silicon solar cells. Organic materials are typically cheap in production, flexible and lightweight, but their efficiencies and long term stabilities are far below the ones of their inorganic counterparts. In the last years, research has been focusing on the identification of new high-efficiency polymers like PTB7-Th with reported efficiencies surpassing 10 % in combination with PC71BM. However, little is known about the long-term stability of this polymer and its blends. Photo-oxidation and morphological changes of the active layer are two main aging processes, which lower the cell performance over time. To learn more about the degradation process, we investigate changes of the polymer under illumination using FT-IR spectroscopy. Additional investigation methods include optical characterization via UV/Vis and PL as well as morphological characterization using X-ray diffraction methods. The change in cell performance is probed by applying IV-measurements.