Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.41: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Investigation on the influence of morphological modifications on the power-conversion efficiency of fullerene-free organic solar cells — •Goran Ivkovic Ivandekic, Sebastian Grott, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching

Highly efficient organic solar cells have received significant attention in recent years. The properties, such as light weight, flexibility and the possibility to be processed at low cost, allow a wide range of application in the field of electronic devices. Although great progress has been made with fullerene-based cells, weak light absorption in the visible spectrum along with high production costs of fullerene derivatives is motivating the increased effort in developing a promising alternative. This study attempts to further improve fullerene-free organics solar cells by modifying the morphology of the photo-active layer. To substitute the fullerene, ITIC is chosen, and a low-bandgap PBDB-T is used. Different PBDB-T:ITIC bulk-heterojunction blends are processed by varying the solvents. The prepared solar cells are characterized using several experimental techniques. To get insight into the inner morphology of the applied bulk-heterojunction grazing-incidence small-angle X-ray scattering (GISAXS) and grazing-incidence wide-angle X-ray scattering (GIWAXS) are used. These information are related to photo-electronic characteristics obtained from UV-vis and PL measurements and current density-voltage curves, in order to get a full understanding of the applied donor-acceptor system.