Regensburg 2004 – wissenschaftliches Programm

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 5: Poster

SYOH 5.15: Poster

Donnerstag, 11. März 2004, 18:00–21:00, B

Dislocation Arrangements in Pentacene Films — •Bert Nickel — Ludwig-Maximilians-Universität München

Organic molecules are currently at the focus of many research programms due to their applications in molecular electronics. Among the various materials under investigation, pentacene (C₂₂H₁₄), a long, flat, aromatic molecule is particularly promising, in part because pentacene easily forms layered crystals if deposited onto flat, inert surfaces, resulting in highly anisotropic transport properties. We have studied the growth of pentacene films (2-8 monolayers) on modified Si-wafer surfaces by means of synchrotron x-ray diffraction. A quantitative analysis of the Bragg and diffuse scattering allows us to identify screw- and edge dislocations as the main defects on the molecular scale. We quantify dislocation densities obtained for different substrate preparations and discuss their potential relation to transport properties.