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Influence of chemical doping and molecular organization on the electronic properties of 2D organic thin films

AutorHieulle, Jeremy; Robles, Roberto ; Cruz, Jorge; Imaz, Inhar ; Maspoch, Daniel ; Moreno, César ; Mugarza, Aitor
Fecha de publicación2016
EditorCSIC-ICN Centro de Investigación en Nanociencia y Nanotecnología (CIN2)
CitaciónFuerzas y Túnel (2016)
ResumenDesigning functional devices based on organic films require a detailed knowledge of the mechanisms that govern their electronic properties. Therefore, it is of prime importance to understand the close relationship existing between the molecular organization of an organic film and its electronic structure. Additionally, the doping of organic semiconductors by using electron donor species like alkali atoms constitutes an effective strategy to improve the performance of organic optoelectronic devices and fabricating materials with exotic electronic properties, such as organic superconductors. Here, we investigate the influence of chemical doping and molecular organization on the electronic properties of a metal-porphyrin derivative (CoTPPBr) by using low-temperature scanning tunneling microscopy (LT-STM) and spectroscopy (STS) techniques. During this work, we observed that the CoTPPBr molecule forms a square self-assembled structure on the Au(111) substrate, similar to what it is generally observed for metalloporphyrin derivatives. In contrast, new self-assembled networks based on the CoTPPBr molecule were seen on the Ag(111) substrate. Additionally, a covalently bound architecture was formed on both substrates after a thermally activated de-bromination reaction. As a consequence, a shift of the HOMO and LUMO orbitals toward higher energies is observed on the silver substrate but not on the gold. Furthermore, a strong modification of the electronic properties of the metal-organic film upon chemical doping was observed using alkali atoms. After doping, the d-levels suffer a drastic change and according to the STS spectra near the Fermi level this has strong consequences to the magnetic state of the molecule. The results presented here give some insights in the realization of covalent metalorganic networks with desired electronic properties.
DescripciónResumen del póster presentado a la 10th Conferencia Fuerzas y Túnel, celebrada en Girona (España) del 5 al 7 de septiembre de 2016.
Aparece en las colecciones: (CIN2) Comunicaciones congresos
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