Electronic coupling effects and charge transfer between organic molecules and metal surfaces [Elektronische Ressource] / vorgelegt von Roman Forker

Institut fu¨r Angewandte PhotophysikFachrichtung PhysikFakult¨at Mathematik und NaturwissenschaftenTechnische Universita¨t DresdenElectronic Coupling Effects andCharge Transfer between OrganicMolecules and Metal SurfacesDissertationzur Erlangung des akademischen GradesDoktor der Naturwissenschaften(Doctor rerum naturalium)vorgelegt vonRoman Forkergeboren am 15. Mai 1981 in R¨ackelwitzDresden 2010Eingereicht am 15.09.20091. Gutachter: Prof. Dr. Karl Leo2. Gutachter: Prof. Dr. Moritz SokolowskiVerteidigt am 12.01.2010AbstractWe employ a variant of optical absorption spectroscopy, namely in situ dif-ferential reflectance spectroscopy (DRS), for an analysis of the structure–properties relations of thin epitaxial organic films. Clear correlations betweenthespectraandthedifferentlyintensecouplingtotherespectivesubstratesarefound. While rather broad and almost structureless spectra are obtained for aquaterrylene(QT)monolayeronAu(111),thespectralshaperesemblesthatofisolatedmoleculeswhenQTisgrownongraphite. Weevenachieveanefficientelectronic decoupling from the subjacent Au(111) by inserting an atomicallythin organic spacer layer consisting of hexa-peri-hexabenzocoronene (HBC)with a noticeably dissimilar electronic behavior. These observations are fur-therconsolidatedbyasystematicvariationofthemetalsubstrate(Au,Ag,andAl), ranging from inert to rather reactive.