The adsorption and surface ordering of
metal-free phthalocyanine (H2PC) on InAs(100)(4 × 2)/c(8 × 2) and InSb(100) c(8
× 2) is investigated using scanning tunnelling microscopy (STM) and synchrotron
based photoelectron spectroscopy. The two systems show structural similarities;
at submonolayer coverage the preferred adsorption site of H2PC is on top of the
In rows, and above 1 monolayer and after thermal treatment the first molecular
layer is ordered in a densely packed '× 3' structure observed with both low
energy electron diffraction and STM.
The electronic properties and the surface
bonds of the two systems are quite different: the InAs–H2PC interface is
semiconducting after room temperature adsorption but becomes metallic upon
thermal treatment whereas InSb(100)–H2PC is semiconducting at all preparations.
These differences are reflected in pronounced differences in the C 1s line
shape between the two systems. N 1s core level spectra from both surfaces
reveal deprotonation of the molecules, i.e. the central hydrogen atoms are lost
upon thermal treatment.
Source:IOPscience
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