Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 45: Organische Dünnschichten IV

O 45.3: Vortrag

Dienstag, 8. März 2005, 16:15–16:30, TU EB301

Ordered (dppy)BF films grown on Ag(110): From submonolayer to multilayer — •Dingyong Zhong¹, Feng Lin¹, Lifeng Chi¹, Yue Wang², and Harald Fuchs¹ — ¹Institute of Physic and Center for Nanotechnology (CeNTech), Universität Münster, Wilhelm-Klemm-strabe 10, 48149 Münster, Germany — ²Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, College of Chemistry, Jilin University, 130012 Changchun, P. R. China

Ordered molecular films of a blue light-emitting material, 1,6-bis(2-hydroxyphenyl) pyridine boron complex [(dppy)BF], grown on the Ag(110) surface by means of organic molecular beam epitaxy, were investigated by scanning tunneling microscopy (STM) and low energy electron diffraction (LEED) under an ultrahigh vacuum. Two commensurate structures exist in the monolayer film grown at 300 K, as found by STM. In the monolayer film, two types of hydrogen bonds are formed between the molecules, which, in addition to the molecule-substrate interaction, essentially determine the monolayer structures. The structural evolution of the (dppy)BF films from submonolayer to 3 monolayers was monitored by LEED in situ and in real time. The results indicate that the growth of the first two monolayers is affected by the periodic potential on the substrate surface, while such a template effect is weakened beyond the second monolayer.