Regensburg 2010 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 27: Poster: Organic Electronics and Photovoltaics
CPP 27.10: Poster
Wednesday, March 24, 2010, 17:30–19:00, Poster C
Crystallization induced phase separation in a double crystalline donor-acceptor diblock copolymer — •Peter Kohn1, Michael Sommer2, Mukundan Thelakkat2, and Thomas Thurn-Albrecht1 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany — 2Angewandte Funktionspolymere, Makromolekulare Chemie I, Universität Bayreuth, 95440 Bayreuth, Germany
A high density of donor-acceptor interfaces ensuring nanoscale domains is of major importance for bulk hetero-junction organic solar cells. Fully functionalized block copolymers consisting of donor- and acceptor-subchains are an attractive class of materials as they inherently carry the desired heterogeneity on the molecular level. We studied the structure formation in a poly(3-hexyl thiophene-b-perylene acrylate) diblock copolymer by temperature dependent small- and wide-angle X-ray scattering. At high temperatures the block copolymer is in the disordered, non-microphase separated state. During cooling separate crystallization of both blocks induces a donor-acceptor phase separation. The resulting morphology of donor- and acceptor crystals separated on the nanoscale demonstrates the potential applicability of this class of materials for organic solar cell devices.