TY - JOUR A1 - Zen, Achmad A1 - Saphiannikova, Marina A1 - Neher, Dieter A1 - Grenzer, Jörg A1 - Grigorian, Souren A. A1 - Pietsch, Ullrich A1 - Asawapirom, Udom A1 - Janietz, Silvia A1 - Scherf, Ullrich A1 - Lieberwirth, Ingo A1 - Wegner, Gerhard T1 - Effect of molecular weight on the structure and crystallinity of poly(3-hexylthiophene) N2 - Recently, two different groups have reported independently that the mobility of field-effect transistors made from regioregular poly(3-hexylthiophene) (P3HT) increases strongly with molecular weight. Two different models were presented: one proposing carrier trapping at grain boundaries and the second putting emphasis on the conformation and packing of the polymer chains in the thin layers for different molecular weights. Here, we present the results of detailed investigations of powders and thin films of deuterated P3HT fractions with different molecular weight. For powder samples, gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and X-ray diffraction (XRD) were used to investigate the structure and crystallization behavior of the polymers. The GPC investigations show that all weight fractions possess a rather broad molecular weight distribution. DSC measurements reveal a strong decrease of the crystallization temperature and, most important, a significant decrease of the degree of crystallinity with decreasing molecular weight. To study the structure of thin layers in lateral and vertical directions, both transmission electron microscopy (TEM) and X-ray grazing incidence diffraction (GID) were utilized. These methods show that thin layers of the low molecular weight fraction consist of well-defined crystalline domains embedded in a disordered matrix. We propose that the transport properties of layers prepared from fractions of poly(3-hexylthiophene) with different molecular weight are largely determined by the crystallinity of the samples and not by the perfection of the packing of the chains in the individual crystallites Y1 - 2006 UR - http://pubs.acs.org/doi/full/10.1021/ma0521349 U6 - https://doi.org/10.1021/Ma0521349 ER - TY - JOUR A1 - Englisch, Uwe A1 - Pietsch, Ullrich A1 - Reiche, Jürgen A1 - Dietzel, Birgit T1 - Neutronenreflektivität von teildeuterierten LB-Filmen mit verschiedenen Verhältnissen on protonierten zu deuterierten Schichten Y1 - 1995 ER - TY - JOUR A1 - Greue, Th. A1 - Barberka, Thomas Andreas A1 - Pietsch, Ullrich A1 - Stumpe, Joachim A1 - Kauppe, G. T1 - Zeitaufgelöste Untersuchungen an Photochromen LB-Multischichten mittels energiedispersiver Röntgenkleinwinkelstreuung, in-plane Beugung und AFM Y1 - 1995 ER - TY - JOUR A1 - Gorfman, Semen A1 - Tsirelson, Vladimir A1 - Pucher, Andreas A1 - Morgenroth, Wolfgang A1 - Pietsch, Ullrich T1 - X-ray diffraction by a crystal in a permanent external electric field : electric-field-induced structural response in alpha-GaPO4 N2 - For the first time, site-selective distortion has been investigated for two different structural units in the ternary compound alpha-GaPO4 under the influence of a permanent external electric field. Based on 54 measured reflection intensities, the electric-field-induced distortion of PO4 and GaO4 tetrahedra in alpha-GaPO4 crystals is evaluated using a model of pseudoatomic displacements introduced recently [Gorfman, Tsirelson & Pietsch (2005). Acta Cryst. A61, 387- 396]. A stronger variation of the P-O bond lengths in the PO4 tetrahedron was found compared to the bonds in the GaO4 tetrahedron. The different distortions of the tetrahedra owing to the electric field were analysed in terms of the valence charge density of alpha-GaPO4 and its topological characteristics. The larger charge of the P pseudoatom compared to the Ga atom was recognized as the main reason for the higher sensitivity of the PO4 tetrahedron to a permanent external electric field Y1 - 2006 UR - http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1600-5724 U6 - https://doi.org/10.1107/S0108767305036111 SN - 0108-7673 ER -