Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster Session I

CPP 20.50: Poster

Monday, March 12, 2018, 17:30–19:30, Poster A

Phase Separation in Phthalocyanine-Fullerene Co-Deposited Thin Films — •Berthold Reisz, Giuliano Duva, Valentina Belova, Clemens Zeiser, Santanu Maiti, Alexander Hinderhofer, Alexander Gerlach, and Frank Schreiber — Universität, Tübingen, Deutschland

Co-deposited blends of copper phthalocyanine (CuPc) and Buckminster fullerenes (C60) are well known phase separating donor-acceptor systems exhibiting (compared to successive deposition) a dramatic modification of the thin film architecture with improved solar cell performance [1,2]. Till today, neither the assignment of morphological features to distinct molecular phases nor the separation processes are known. We followed the growth of pure and blended thin films by in situ real-time X-ray reflectivity and found material dependent roughening during the growth. Post growth X-ray diffraction at two grazing angles of incidence revealed an accumulation of C60-molecules at the surface, which may correspond to the tall features seen from atomic force microscopy. Further experiments aiming at a deeper insight into the phase separation processes are planned.

[1] P. Sullivan et al., Appl. Phys. Lett. 84 (2004)

[2] S. Heutz et al., Sol. Energ. Mat. Sol. Cells 83 (2004)