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Phys. Rev. B 68, 195414 (2003) [7 pages]

Electronic structure of highly ordered films of self-assembled graphitic nanocolumns

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R. Friedlein1 *, X. Crispin1, C. D. Simpson2, M. D. Watson2 †, F. Jäckel3, W. Osikowicz1, S. Marciniak1, M. P. de Jong1, P. Samorí3 ‡, S. K. M. Jönsson1,4, M. Fahlman1,4, K. Müllen2, J. P. Rabe3, and W. R. Salaneck1
1Department of Physics (IFM), Linköping University, 581 83 Linköping, Sweden
2Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
3Department of Physics, Humboldt University Berlin, Newtonstrasse 15, 12489 Berlin, Germany
4Department of Science and Technology, ITN, Linköping University, 601 74 Norrköping, Sweden

Received 24 May 2003; revised 12 August 2003; published 20 November 2003

Highly ordered, several nanometers thick films of alkylated large planar, polycyclic aromatic hydrocarbon (PAH) molecules have been grown on semi-metallic molybdenum disulfide substrates. The films are characterized by a two-dimensional lateral arrangement of columns standing at the surface on a macroscopic scale. The self-assembly of such insulated columns of face-to-face disks with surface-induced vertical alignment has been achieved directly from solution processing. Angle-resolved photoelectron spectra revealed a highly anisotropic quasi-one-dimensional electronic structure with an extended π-electronic wave function. An intermolecular dispersion of the highest occupied band of at least 0.15 eV along the stacking direction has been measured. A partial breakdown of the concept of quasimomentum due to the finite size of the nano-objects perpendicular to the stacks is observed.


©2003 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.68.195414
DOI: 10.1103/PhysRevB.68.195414
PACS: 73.22.Dj, 61.30.Hn, 64.70.Md, 79.60.Fr

* Email address: raifr@ifm.liu.se
† Present address: University of Kentucky, Department of Chemistry, Lexington, Kentucky 40506-0055.
‡ Present address: Instituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerce, 40129 Bologna, Italy.

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