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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: POSTER: Polymer Physics

CPP 8.36: Poster

Montag, 26. März 2007, 16:00–18:00, Poster B

Photovoltaic Devices Based on Semiconducting Block-Copolymers — •S Huettner¹, S Lindner², A Chiche¹, G Krausch¹, and M Thelakkat² — ¹Physikalische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany — ²Makromolekulare Chemie I, Universität Bayreuth, 95440 Bayreuth, Germany

We investigate the concept of photovoltaic devices based on block copolymers. The use of a functionalized block copolymer made of electron donor (D) and acceptor (A) polymers lead to a self assembled microstructure that insures the photon to be absorbed within a very short distance (tens nm) to the D-A interface. A block copolymer made of a poly(vinyltriphenylamine) (D) and poly(perylene bisimide acrylate) (A) has been synthesized [1]. Photovoltaic devices made of such a copolymer film have shown significantly better efficiencies than similar devices made from a blend of the corresponding homopolymers [2]. The reason for that clearly lies in the different morphologies. The blend-based device exhibits a phase separation resulting in micron sized domains and resulting in an important loss of post-absorption excited states that cannot reach the interface.

[1] S. Lindner, M. Thelakkat, Macromolecules 37, 8832 (2004) [2] S. Lindner, S. Hüttner, A. Chiche, M. Thelakkat, G. Krausch, Angew. Chem. Int. Ed. 45, 3364 (2006)