Dresden 2006 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 23: POSTER Functional Organic Thin Films
CPP 23.50: Poster
Thursday, March 30, 2006, 17:00–19:00, P2
Self assembled nanostructured photovoltaic devices made of functionalized block copolymers — •Sven Hüttner1, Stefan Lindner2, Arnaud Chiche1, Georg Krausch1, and Mukundan Thelakkat2 — 1Physikalische Chemie II, Universität Bayreuth, D-95440 Bayreuth, Germany — 2Makromolekulare Chemie I, Universität Bayreuth, D-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. 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, (2004) 8832-8835