| Issue |
Europhys. Lett.
Volume 59, Number 3, August 2002
|
|
|---|---|---|
| Page(s) | 423 - 429 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00212-8 | |
| Published online | 01 September 2002 | |
Analysis of the three-dimensional structure
of a small crystallite by scanning tunneling
microscopy: Multilayer films of 3,4,9,10-perylenetetracarboxylic-dianhydride (PTCDA) on 
Universität Essen, Fachbereich Physik -
Universitätsstr. 2, D-45117 Essen
Received:
8
April
2002
Accepted:
7
May
2002
The growth of 3,4,9,10-perylenetetracarboxylic-dianhydride
(PTCDA) on has been investigated by STM in the
range of a few up to more than 20 molecular layers. It is found
to grow in the Stranski-Krastanov mode leading to well-ordered
mesa-type crystalline grains of different structure and
orientation relative to the substrate. By operating a scanning
tunneling microscope at a low tunneling current of 2
, we
were able to resolve the individual molecules on the flat top of
the crystallites as well as on the facets descending to the
substrate. As will be shown, this offers the unique possibility to
determine unambiguously the three-dimensional structure. For a
given grain a detailed analysis will be presented yielding the
unit cell and the relative displacement between subsequent layers.
PACS: 68.55.Jk – Structure and morphology; thickness; crystalline orientation and texture / 68.37.Ef – Scanning tunneling microscopy (including chemistry induced with STM) / 81.15.Hi – Molecular, atomic, ion, and chemical beam epitaxy
© EDP Sciences, 2002
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