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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Poster Session 1 (joint session with BP)
CPP 19.55: Poster
Tuesday, April 1, 2014, 09:30–13:00, P1
Temperature induced conformal changes in P3HT — •Fabian Panzer1, Ruth Lohwasser2, Mukundan Thelakkat2, and Anna Köhler1 — 1Experimental Physics II, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth — 2Macromolecular Chemistry I, University of Bayreuth, Universitätsstraße30, 95447 Bayreuth
P3HT is known to exist in two distinct conformations, associated with different film morphologies. These conformations consist of coiled higher-energy phase and aggregated red phase implying a more extended, planarized and better ordered conformation. These two conformations show different behaviors in absorption and fluorescence, leading to a strong impact on device performance such as OLEDs or solar-cells. We show here that the transition from one phase to the other is a phenomenon that can also be induced by temperature and occurs at a critical temperature in the polymer P3HT. We have investigated how these conformational changes depend on various material parameters such as molecular weight and polydispersity.