Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: P2: Organic Electronics and Photovoltaics

CPP 30.12: Poster

Tuesday, March 17, 2015, 14:00–16:00, Poster B

Characterization and comparison of the optical properties of high-efficiency polymers PBDTT-FTTE and PBT7 — •Franziska Löhrer, Shuai Guo, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching

Organic photovoltaics are gaining impact as a feasible alternative to conventional silicon solar cells. Using polymers as active material has several potential advantages, for instance reduced production costs and an increased device flexibility. A prominent and well-understood example is P3HT, which has been diligently investigated in the last years. However, efficiencies stay far below those of competing inorganic solar cells. Recent research efforts focus on identifying new high-efficiency polymers in order to enhance the cell performance. This has led to the development of high-efficiency materials such as PTB7 or the new PBDTT-FTTE with reported efficiencies approaching 10 %. However, these materials are still very cost-intensive and their functionality is not yet fully understood. Previous morphological investigations linked to the device performance give first insights into the working mechanisms of PTB7 based solar cells. In the present study we investigate the optical and morphological properties of PBDTT-FTTE in comparison to those of PTB7 and the well-known P3HT. Applied characterization techniques include UV/Vis- and IV-measurements, optical microscopy, AFM, as well as XRR and GISAXS/GIWAXS. Exploratory solar cells link the conversion efficiency to parameters such as the composition and morphology of the active layer.