English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Direct observation of epitaxial organic film growth: temperature-dependent growth mechanisms and metastability

MPS-Authors
/persons/resource/persons21844

Marchetto,  Helder
Chemical Physics, Fritz Haber Institute, Max Planck Society;
ELMITEC Elektronenmikroskopie GmbH;

/persons/resource/persons22076

Schmidt,  Thomas
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Universität Würzburg, Experimentelle Physik;

/persons/resource/persons21798

Lévesque,  Pierre L.
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Université de Montréal, Département de Chimie;

/persons/resource/persons21524

Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons129660

Umbach,  Eberhard
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Universität Würzburg, Experimentelle Physik;

External Resource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Marchetto, H., Schmidt, T., Groh, U., Maier, F. C., Lévesque, P. L., Fink, R. H., et al. (2015). Direct observation of epitaxial organic film growth: temperature-dependent growth mechanisms and metastability. Physical Chemistry Chemical Physics, 17(43), 29150-29160. doi:10.1039/C5CP05124J.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-1925-6
Abstract
The growth of the first ten layers of organic thin films on a smooth metallic substrate has been investigated in real-time using the model system PTCDA on Ag(111). The complex behaviour is comprehensively studied by electron microscopy, spectroscopy and diffraction in a combined PEEM/LEEM instrument revealing several new phenomena and yielding a consistent picture of this layer growth. PTCDA grows above room temperature in a Stranski–Krastanov mode, forming three-dimensional islands on a stable bi-layer, in competition with metastable 3rd and 4th layers. Around room temperature this growth mode changes into a quasi layer-by-layer growth, while at temperatures below about 250 K a Vollmer–Weber-like behaviour is observed. By means of laterally resolved soft X-ray absorption spectroscopy the orientation of all adsorbed molecules is found to be homogeneously flat lying on the surface, even during the growth process. The films grow epitaxially, showing long-range order with rotational domains. For the monolayer these domains could be directly analysed, showing an average size of several micrometers extending over substrate steps.