Parts | Days | Selection | Search | Updates | Downloads | Help
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 PBTTT — Matthias 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 Andrienko2 — 1University 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.