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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.16: Poster

Donnerstag, 26. März 2009, 16:30–19:00, P1A

X-ray Diffraction Studies of Different Polythiophene based Polymers Thin Films — •Shabi Thankaraj Salammal¹, Souren Grigorian¹, Ullrich Pietsch¹, Niel Koennen², and Ullrich Scherf² — ¹Solid State Physics, University of Siegen, Siegen, Germany — ²Macromolecular Chemistry, University of Wuppertal, Wuppertal, Germany

Poly(thiophenes) and its derivatives have received special considerations for organic device applications. One open question to solve in what extend the crystalline structure is responsible for the conductive properties of the polymers. Our aims are to understand the crystallinity and interface induced ordering of such thiophene based family by exploiting surface sensitive X-ray diffraction technique and its correlatation to charge carrier mobility. Our primarily results have shown the variation of in inter-planar distances of these different polythiophene based derivatives, for P3PT = 1.52 nm, P3HT = 1.65 nm, P3HepT = 1.79 nm and P3OT = 1.99 nm. We have found that P3HT is indeed the derivate with highest crystallinity compared to the other three thiophene derivatives. It is the only one showing the second and third order Bragg peak in addition to the first order. Our current studies indicate that by keeping the substrate and solution at low temperature while growing, one can increase the crystallinity of the thiophene derivatives.