Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 29: Crystallisation, Nucleation and Self assembly
CPP 29.9: Vortrag
Mittwoch, 28. März 2012, 17:45–18:00, C 243
microphase behavior and structure of P3HT-b-PPerAcr donor-acceptor block copolymers — Gaurav Gupta1, Peter Kohn1, Thomas Thurn Albrecht1, Michael Sommer2, Ruth Lohwasser2, and •Mukundan Thelekkat2 — 1Experimental Polymer Phsik, Martin Luther University Halle — 2Applied Functional Polymers, Macromolecular Chemistry I, University of Bayreuth
Combination of electron and hole conducting organic materials for photovoltaic devices has been an area of extensive research. Short lifetime of the photo generated excitons resulting in diffusion lengths of the order of 10 nm sets a morphological requirement of having nano scale domains. The property of block copolymers to microphase separate into well defined periodic nano structures can be an ideal solution to this morphological requirement as well as for the simultaneous conduction for the dissociated charge carriers. Here we present the structural characterization of a donor *acceptor block copolymer based on side chain poly(perylene-acrylate) as electron conductor and P3HT as hole conductor. Based on scattering measurements we find a molecular weight dependence on the mechanism of microphase separation. While the lower molecular weight polymer showed a transition from a disordered melt at high temperatures to a nanostructured morphology, induced by the crystallization of individual blocks, the higher molecular weight polymer exhibited a microphase separated morphology. The latter remained intact even at low temperatures when crystallization in the individual blocks occurs.