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Pentacene films on Cu(119).

E Annese1, I Vobornik, G Rossi

  • 1TASC Laboratory, IOM-CNR, SS 14, km 163.5, I-34149 Trieste, Italy. annese@tasc.infm.it

Langmuir : the ACS Journal of Surfaces and Colloids
|November 25, 2010
PubMed
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Highly ordered thin films of pentacene on copper surfaces were achieved. Molecular orientation transitions from flat to upright herringbone structures with increasing film thickness, enabling controlled film growth.

Area of Science:

  • Surface Science
  • Materials Science
  • Organic Electronics

Background:

  • Pentacene is a key organic semiconductor for electronic applications.
  • Controlling molecular ordering in thin films is crucial for device performance.
  • Understanding substrate-molecule interactions influences film morphology.

Purpose of the Study:

  • To investigate the molecular structure of pentacene films on a Cu(119) surface.
  • To determine the influence of film thickness on pentacene molecular orientation.
  • To explore the interaction between pentacene and the copper substrate.

Main Methods:

  • Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy.
  • Scanning tunneling microscopy (STM).
  • Polarization-dependent X-ray absorption spectroscopy (XAS).

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Main Results:

  • Pentacene molecules lie flat on Cu(119) terraces at low coverages.
  • An upright, herringbone molecular ordering emerges for films thicker than 4 nm.
  • XAS spectra revealed interactions between pentacene's π-orbitals and the copper substrate.

Conclusions:

  • Highly ordered pentacene films can be grown on Cu(119) vicinal surfaces.
  • Film morphology can be controlled by adjusting coverage, transitioning between flat and upright orientations.
  • This work provides insights into achieving ordered organic semiconductor films.