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Abstract
We study interface properties of CoPcFx and FePcFx (x = 0 or 16) on niobium-doped SrTiO3(100) surfaces using mainly X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. For all studied molecules, a rather complex, bidirectional charge transfer with the oxide substrate was observed, involving both the macrocycle and the central metal atom. For molecules of the first monolayer, an electron transfer to the central metal atom is concluded from transition metal 2p core level photoemission spectra. The number of interacting molecules in the first monolayer on the oxide surface depends on the central metal atom of the phthalocyanine, whereas the substrate preparation has minor influence on the interaction between CoPc and SrTiO3(100). Differences of the interaction mechanism to related TiO2 surfaces are discussed.
Highlights
Interfaces between organic semiconductors and oxides are of increasing fundamental interest
The cleanliness is checked by X-ray photoelectron spectroscopy and the quality of the surface structure by LEED
To investigate whether the observed local interaction between the central metal atom of CoPcFx (x = 0 or 16) and the STO substrate is specific for the Co ion, we study interface properties of the related system FePcFx on STO(100)
Summary
Interfaces between organic semiconductors and oxides are of increasing fundamental interest. The lower binding energy of the interface component arises from an electron transfer to the central Co ion of CoPc, which can be accompanied by a backdonation from the macrocycle to the substrate [61,62], in good agreement to the observed binding energy shifts of N 1s and C 1s core level spectra discussed above.
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