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 4.58: Poster
Donnerstag, 26. März 2009, 16:30–19:00, P1A
2d-gisaxs investigation of the crystal structure in thin polymer films — •Yun Gu1, Ullrich Pietsch1, Ingolf Hennig2, and Walter Cox2 — 1FKP Universität Siegen — 2BASF-Ludwigshafen
Structure and crystallinity of thin polymer film made from PDI8CN2 on silicon substrates were investigated by Grazing Incidence Small Angle X-ray Scattering using synchrotron radiation. The samples were prepared by spin-coating at different temperatures onto native SiO2 or substrates treated with OTS. The measurements were performed at DELTA in Dortmund. From the two dimensional GISAXS pictures, a large number of distinct Bragg spots appeared above a low diffuse background which refer to a high degree of crystallinity. The position of Bragg peaks was transformed in a set of d-values and used for the determination of the triclinic space group and respective lattice parameters. Based on this structure model all Bragg peaks could be indexed which allows for the determination of crystal orientations. Our data give evidence that all crystals coincides with one axis [100] parallel to surface normal; the other two axes show random orientation within the surface plane. Based on Scherrer equation the out-of plane crystallite size is same as the layer thickness and the average in-plane size is about 30nm. Comparing the different samples, we found that both crystal structure and orientation do not depend on film thickness.