Extended iron phthalocyanine islands self-assembled on a Ge(001):H surface

Abstract

Self-assembly of iron(II) phthalocyanine (FePc) molecules on a Ge(001):H surface results in monolayer islands extending over hundreds of nanometers and comprising upright-oriented entities. Scanning tunneling spectroscopy reveals a transport gap of 2.70 eV in agreement with other reports regarding isolated FePc molecules. Detailed analysis of single FePc molecules trapped at surface defects indicates that the molecules stay intact upon adsorption and can be manipulated away from surface defects onto a perfectly hydrogenated surface. This allows for their isolation from the germanium surface.

Substrate-Dependent Physical Properties at the Interface of Manganese(II) Phthalocyanine and Topological Insulators

“…The height of the chain-like structure is too high for a flat-lying molecule, meaning that MnPc molecules are adsorbed with an upright configuration on TlBiSe 2 . The presence of upright molecular configuration is reported in systems with the weak molecule–substrate interaction − and at the step edges of the surface . Since no step is observed in Figure d,e, the upright configuration of the MnPc molecules would not be due to the roughness of the surface, and we therefore conclude that the upright configuration of the MnPc molecules results from the fact that the MnPc–TlBiSe 2 interaction is weaker than the MnPc–MnPc intermolecular interaction.…”

Molecular assemblies on surfaces: towards physical and electronic decoupling of organic molecules

“…Physical decoupling of molecules from a semiconducting substrate is discussed for the example of both insulating CaF 2 thin films on Si(111) [ 91 ] and hydrogen passivation of Ge(001) surfaces [ 92 ]. In the first case, three scenarios were compared: PTCDA on Si, on a thin CaF 2 , and on a thicker CaF 2 layer.…”