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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.34: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Tuning the molecular organization in organic heterostructures — •Claudia Weis1, Esther Barrena1,2, Dimas Garcia de Oteyza1, Xue Na Zhang1, and Helmut Dosch1,2 — 1Max-Planck-Institut für Metallforschung, — 2Institut für Theoretische und Angewandte Physik,
Pentacene and fluorinated copper-phthalocyanines (F16CuPc) are among the most popular building blocks for prototype organic heterostructures in modern electronic devices. When deposited onto pentacene on SiO2, F16CuPc molecules assemble in a lying-down configuration along the pentacene step edges, whereas on top of the pentacene terraces, they arrange in the energetically preferred upright-standing configuration[1]. In the present work, we show by X-ray diffraction measurements and atomic force microscopy that the lying-down configuration is suppressed if a small amount (≤ 2ML) of an additional molecule, i.e. PTCDI-C8 (N,N*-dioctyl-3,4,9,10-perylene tetracarboxylic diimide), is deposited onto the pentacene prior to the F16CuPc growth. Forcing the molecular arrangement exclusively to the upright-standing phase is essential for optimal charge carrier transport along the film plane as required in ambipolar transistors or the recently demonstrated organic light-emitting transistors (OLETs).
[1] D. G. de Oteyza et al., Chem. Mater. 18, 4212 (2006).