Potassium-intercalated H2Pc films: Alkali-induced electronic and geometrical modifications
2012 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 137, no 4, 044708- p.Article in journal (Refereed) Published
X-ray spectroscopy studies of potassium intercalated metal-free phthalocyanine multilayers adsorbed on Al(110) have been undertaken. Photoelectron spectroscopy measurements show the presence of several charge states of the molecules upon K intercalation, due to a charge transfer from the alkali. In addition, the comparison of valence band photoemission spectra with the density functional theory calculations of the density of states of the H2Pc- anion indicates a filling of the formerly lowest unoccupied molecular orbital by charge transfer from the alkali. This is further confirmed by x-ray absorption spectroscopy (XAS) studies, which show a decreased density of unoccupied states. XAS measurements in different experimental geometries reveal that the molecules in the pristine film are standing upright on the surface or are only slightly tilted away from the surface normal but upon K intercalation, the molecular orientation is changed in that the tilt angle of the molecules increases.
Place, publisher, year, edition, pages
2012. Vol. 137, no 4, 044708- p.
Copper Phthalocyanine, Iron Phthalocyanine, Zinc Phthalocyanine, Metal-Free, Growth, Xps, Photoelectron, Interface, Oxidation, Catalyst
IdentifiersURN: urn:nbn:se:kth:diva-102634DOI: 10.1063/1.4738755ISI: 000307611500056OAI: oai:DiVA.org:kth-102634DiVA: diva2:555840
FunderSwedish Research Council
QC 201209212012-09-212012-09-212012-09-21Bibliographically approved