Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 6: Organic/bio Molecules on Metal Surfaces I
O 6.5: Vortrag
Montag, 11. März 2013, 11:30–11:45, H38
Site and orbital-dependent charge donation and spin manipulation in electron doped metal-phthalocyanines — •Cornelius Krull1, Roberto Robles2, Aitor Mugarza1, and Pietro Gambardella1,3 — 1Catalan Institute of Nanotechnology (ICN), Barcelona, Spain — 2Centre d'Investigacions en Nanociència i Nanotecnologia (CIN2), Barcelona, Spain — 3Institució Catalana de Recerca i Estudis Avançats (ICREA) Universitat Autonoma de Barcelona, Barcelona, Spain
Similar to silicon-based electronics, chemical doping offers a tool for tailoring the electrical characteristics of organic molecular compounds. Contrary to inorganic semiconductors, however, controlling the position of dopants and charge donation in molecular complexes is a complicated task due to the existence of multiple doping sites, electron acceptor levels, and intramolecular correlation effects. Here we use scanning tunneling microscopy to observe the position of single Li dopants within Cu-phthalocyanine and Ni-phthalocyanine molecules in contact with a metal substrate and probe the charge transfer process with unprecedented spatial resolution. We show that individual phthalocyanines can accommodate at least three stable nonequivalent doping sites and up to six dopant atoms. Ligand and metal orbitals can be selectively charged by modifying the configuration of the Li complexes. Because of strong charge-spin correlation in confined molecular orbitals, alkali atoms provide an effective way to tune the molecular spin without introducing magnetic dopants.