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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Poster: Organic Electronics and Photovoltaics

CPP 27.10: Poster

Mittwoch, 24. März 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.