Dresden 2009 – wissenschaftliches Programm
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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 4: Organic Photovoltaics: from Single Molecules to Devices
SYOP 4.64: Poster
Donnerstag, 26. März 2009, 16:30–19:00, P1A
Effect of π-π stacking distance in low-band-gap PPE-PPV polymers on the morphology and performance of polymer-fullerene solar cells — •Rupali Jadhav1, Stefan Türk3, Florian Kühnlenz1, Daniel Egbe2, and Harald Hoppe1 — 1Institute of Physics, Technical University Ilmenau, 98673 Ilmenau, Germany — 2Institute of Organic and Macromolecular Chemistry, Friedrich-Schiller-University Jena, 07743 Jena , Germany — 3Institute for Print and Media Technology, Chemnitz University of Technology, 09107 Chemnitz, Germany
Poly(-p-arylene-ethynylene)-alt-poly(-p-arylene-vinylene)s, (PAE-PAVs) are conjugated systems, which combine the interesting intrinsic properties of both their constituents within a single polymeric backbone and in addition show novel promising structure-specific properties. They can be effectively used as donor materials in polymer-PCBM bulk heterojunction polymer solar cells. Their photovoltaic parameters were found to be dependent on the concerting effects of backbone conjugation pattern, and the nature and size of the solubilizing alkoxy side chains. Moreover, the insertion of electron-rich thiophene leads to a reduction of the optical band gap energy. Reduction of the length of the side chains on the other hand results in a significant increase of the short circuit current, which can be explained in terms of an extended donor-acceptor interfacial area. The active layer nano-scale morphology of these polymer/fullerene blend films has been investigated using Atomic Force Microscopy and is related to the different chemical structures of the donor polymers.