Electronic properties of the interface between α,ω-dihexyl-quaterthiophene and gold

The interface properties of α,ω-dihexyl-quaterthiophene (DH4T) on gold have been investigated by photoemission spectroscopy studies. Our data indicate the formation of a monolayer of flat lying DH4T molecules and an interaction of the molecules with gold. We find an interface dipole of 1.2 eV and an injection barrier for holes of about 0.85 eV.