Abstract
Islands composed of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) molecules are grown on a hydrogen passivated Ge(001):H surface. The islands are studied with room temperature scanning tunneling microscopy and spectroscopy. The spontaneous and tip-induced formation of the top-most layer of the island is presented. Assistance of the scanning probe seems to be one of the factors that facilitate and speed the process of formation of the top-most layer.
Highlights
On-surface engineering of molecular nanostructures is one of the key elements for many forthcoming technologies
The accumulation of the PTCDA molecules is dominated by molecule–molecule interactions and molecular islands are formed
It is possible to achieve high-resolution images on top of the islands in rt scanning tunneling microscope (STM). These images show that the islands have crystalline character, and the top-most layer closely resembles the herringbone structure found for the (102) plane of PTCDA bulk crystal [21,22]
Summary
On-surface engineering of molecular nanostructures is one of the key elements for many forthcoming technologies. High-resolution scanning tunneling microscope (STM) measurements of self-assembled perylene-3,4,9,10tetracarboxylic dianhydride (PTCDA) molecular islands on a hydrogen passivated germanium surface, Ge(001):H, are presented. We found that the presence of a scanning tip of the tunneling microscope facilitates and speeds the formation of a new full top-layer of the island.
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