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Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: P2: Organic Electronics and Photovoltaics

CPP 30.4: Poster

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

Morphological and dynamic ordering of the semiconducting polymer PBTTTMatthias J. N. Junk1, Dmytro Dudenko2, Nichole Cates Miller3, Sean Sweetnam3, Michael D. McGehee3, Bradley F. Chmelka1, Michael R. Hansen2,4, Kurt Kremer2, •Anton Melnyk2, and Denis Andrienko21University of California, Santa Barbara, California 93106, U.S.A. — 2Max-Planck-Institute für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany — 3Stanford University, Stanford, California, 94305, U.S.A. — 4Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark

Molecular dynamics of the conjugated polymer poly(2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT-C16) are quantitatively measured using solid-state NMR spectroscopy and compared to atomistic molecular dynamics simulations. The comparison reveals crystalline domains that have well-ordered interdigitated alkyl sidechains with restricted rotational mobilities up to the terminal methyl group, accompanied by well-ordered polymer backbones. Amorphous domains, which comprise 50% of as-synthesized PBTTT-C16, consist of disordered side chains with a significantly higher degree of rotational mobility. from planarity in amorphous domains. In conjunction with a decreased π−π stacking order, the partially interrupted backbone conjugation may be predominantly responsible for significantly decreased charge-carrier mobility in the amorphous regions.

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