Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Poster Session 1 (joint session with BP)

CPP 19.40: Poster

Dienstag, 1. April 2014, 09:30–13:00, P1

Combination of Raman spectroscopy and GIWAXS for the investigation of the morphology of organic solar cell materials — •Simon Schmitt¹, Eva Herzig², Franziska Fuchs¹, Vladimir Dyakonov^1,3, Peter Müller-Buschbaum², and Carsten Deibel¹ — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²MSE & Physik-Department, LS Funktionelle Materialien, Technische Universität München, 85747 Garching — ³ZAE Bayern, 97074 Würzburg

The efficiency of organic solar cells crucially depends on their active layer morphology and donor:acceptor phase separation. Therefor a more thorough understanding of the impact of varying preparation parameters on morphology changes is important to improve solar cell performance. In this study we combine the two complementary nondestructive scattering techniques of Raman spectroscopy and GIWAXS (grazing incidence wide-angle X-ray scattering) for the investigation of the PCDTBT:PC₇₀BM blend system. GIWAXS provides information about the molecular order whereas the Raman spectra reveal the vibrational modes of the conjugated polymer and fullerene. We discuss our experimental findings for different donor:acceptor blend ratios in view of the high degree of disorder in the polymer PCDTBT and the implications for the morphology-performance relation.