Structures and Electronic Properties of Organic Self-Assembled Monolayers Characterized by STM and XPS

Abstract : One of the most important scientific challenges for the next decades is to build and to control devices at the nanometer scale. These nano-devices promise to have many applications in physics, chemistry and medicine. For example the nano-devices may be used to go further in the miniaturization of electronic compounds in order to improve the processors efficiency and perfor- mances. A judicious manner to create nano-devices is to take advantage of inter-molecular interac- tions in order to obtain self-assembled structures using a small numbers of molecules ("bottom-up" approach). The objective of this thesis was to create new organic self-assembled monolayers (SAMs), and to investigate their structures and electronic properties. Scanning tunneling microscopy (STM) was used to determine molecular organization with an atomic resolution. It was observed that the molecular skeleton and substituents used are key parameters driving the molecular self-assembly. Additionally we have showed that a post-annealing of the sample can be used not only to change the structure of a perylene-based film as it is usually expected but also to modify its electronic states. Photoemission-based techniques combined with synchrotron radiation facilities were used to access to the chemical and electronic properties of SAMs. A strong modification of the line- shape and energy positions of the electronic states of SAMs with the molecular film thickness was observed. In the same way core-hole-clock spectroscopy shows that the charge transfer dynamics at the PTCDI/Au(111) interface is strongly affected by the film thickness.
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Jérémy Hieulle. Structures and Electronic Properties of Organic Self-Assembled Monolayers Characterized by STM and XPS. Condensed Matter [cond-mat]. Ecole Doctorale de l'Ecole Polytechnique, 2014. English. ⟨tel-01291328⟩

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