Abstract
We studied the self-organization process of F16CuPc films (20–30 ML) on stepped Al2O3 (1120) substrates. X-ray diffraction measurements revealed a highly ordered layered structure with the molecules in a nearly upright configuration. The morphology, investigated by atomic force microscopy, consisted of long (several microns) and narrow (20–100 nm) needlelike terraces unidirectionally aligned along one of the main crystallographic directions of the Al2O3 (1120) surface. High resolution atomic force microscopy images revealed in-plane molecular order with the molecular stacking direction parallel to the needlelike terraces. Such anisotropic morphology is the result of a self-organization process of F16CuPc in elongated crystallites driven to a preferential orientation by the interaction with the substrate. Spectroscopic ellipsometry showed that these films exhibit anisotropic optical properties correlated with the molecular arrangement.
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References
S.R. Forrest: Ultrathin organic films grown by organic molecular beam deposition and related techniques. Chem. Rev. 97, 1793 (1997).
G. Horowitz: Organic field-effect trasistors. Adv. Mater. 10, 365 (1998).
C.D. Dimitrakopoulus and D.J. Mascaro: Organic thin-film transistors: A review of recent advances. IBM. J. Res. Dev. 45, 11 (2001).
D. Schlettwein: Electronic Properties of Molecular Organic Semiconductor Thin Films (Academic Press, San Diego, CA, 2001).
D.E. Hooks, T. Fritz, and M.D. Ward: Epitaxy and molecular organization on solid substrates. Adv. Mater. 13, 227 (2001).
A. Koma: Molecular beam epitaxial growth of organic thin films. Prog. Crystal Growth Charact. 30, 129 (1995).
E. Umbach, M. Sokolowski, and R. Fink: Substrate-interaction, long-range order, and epitaxy of large organic adsorbates. Appl. Phys. A 63, 656 (1996).
A. Yamashita and T. Hayashi: OMBD of metallophthalocyanines. Adv. Mater. 8, 791 (1996).
B. Krause, A.C. Dürr, K.A. Ritley, F. Schreiber, and H. Dosch: On the coexistence of different polymorphs in organic epitaxy: Alpha and beta phase of PTCDA on Ag(111). Appl. Surf. Sci. 175–176, 332 (2001).
C. Kendrick and A. Kahn: Epitaxial growth and phase transitions in multilayers of the organic semiconductor PTCDA on InAs(001). J. Cryst. Growth 181, 181 (1997).
P. Fenter, F. Schreiber, L. Zhou, P. Eisenberger, and S.R. Forrest: In situ studies of morphology, strain, and growth modes of a molecular organic thin film. Phys. Rev. B 56, 3046 (1997).
B. Krause, A.C. Dürr, K.A. Ritley, F. Schreiber, H. Dosch, and D. Smilgies: Structure and growth morphology of an archetypal system for organic epitaxy: PTCDA on Ag(111). Phys. Rev. B 66, 235404 (2002).
A.C. Dürr, F. Schreiber, K.A. Ritley, V. Kruppa, J. Krug, H. Dosch, and B. Struth: Rapid roughening in thin film growth of the organic semiconductor diindenoperylene (DIP). Phys. Rev. Lett. 90, 016104 (2003).
B. Krause, A. Dürr, F. Schreiber, H. Dosch, and O. Seeck: Thermal stability and partial dewetting of crystalline organic thin films: 3,4,9,10-perylenetetracarboxylic dianhydride on Ag(111). J. Chem. Phys. 119, 3429 (2003).
A.M. van de Craats, N. Stutzmann, O. Bunk, M.M. Nielsen, M. Watson, K. Müllen, H.D. Chanzy, H. Sirringhaus, and R.H. Friend: Meso-epitaxial solution-growth of self-organizing discotic liquid-crystalline semiconductors. Adv. Mater. 15, 495 (2003).
J. Piris, M.G. Debije, N. Stutzmann, A.M. van de Craats, M.D. Watson, K. Müllen, and J.M. Warman: Anisotropy in the mobility and photogeneration of charge carriers in thin films of discotic hexabenzocoronenes, columnarly self-assembled on friction-deposited poly (tetrafluoroethylene). Adv. Mater. 15, 1736 (2003).
J.O. Ossó, F. Schreiber, V. Kruppa, H. Dosch, M. Garriga, M.I. Alonso, and F. Cerdeira: Controlled molecular alignment in phthalocyanine thin films on stepped sapphire surfaces. Adv. Funct. Mat. 12, 455 (2002).
Z. Bao, A.J. Lovinger, and J. Brown: New air-stable n-channel organic thin film transistors. J. Am. Chem. Soc. 120, 207 (1998).
M.I. Alonso, M. Garriga, J.O. Ossó, F. Schreiber, E. Barrena, and H. Dosch: Strong optical anisotropies of F16CuPc thin films studied by sprectroscopic ellipsometry. J. Chem. Phys. 119, 6335 (2003).
J.O. Ossó, M. Garriga, F. Schreiber, E. Barrena, M.I. Alonso, and H. Dosch. Bulk crystal structure of copper hexadecafluorophthalocyanine. (2004, unpublished).
M. Yoshimoto, T. Maeda, T. Ohnishi, H. Koinuma, O. Ishiyama, M. Shinohara, M. Kubo, R. Miura, and A. Miyamoto: Atomicscale formation of ultrasmooth surfaces on sapphire substrates for high-quality thin-film fabrication. Appl. Phys. Lett. 67, 2615 (1995).
G. Beitel, K. Markert, J. Wiechers, J. Hrbek, and R.J. Behm, Characterization of Single-Crystal a-Al2O3 (0001) and Surfaces and Ag/Al2O3 Model Catalysts by Atomic Force Microscopy (Springer-Verlag, Berlin, Heidelberg, Germany, 1993).
Th. Becker, A. Birkner, G. Witte, and Ch. Wöll: Microstructure of the α—Al2O3 surface. Phys. Rev. B 65, 115401 (2002).
J.O. Ossó, F. Schreiber, M.I. Alonso, M. Garriga, E. Barrena, and H. Dosch: Structure, morphology, and optical properties of thin films of F16CuPc grown on silicondioxide. Organic Electron. 5, 135 (2004).
F. Iwatsu, T. Kobayashi, and N. Uyeda: Solvent effects on crystalgrowth and transformation of zinc phthalocyanine. J. Phys. Chem. 84, 3223 (1980).
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Barrena, E., Ossó, J.O., Schreiber, F. et al. Self-organization of phthalocyanines on Al2O3 (1120) in aligned and ordered films. Journal of Materials Research 19, 2061–2067 (2004). https://doi.org/10.1557/JMR.2004.0258
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DOI: https://doi.org/10.1557/JMR.2004.0258