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How phthalocyanines interact with silicon substrates : a review of photoelectron spectroscopy experiments

100%

Ottaviano L. , Lozzi L. , Santucci S.

2000

tom Vol. 33, No. 1/2

125-135

We review a variety of experiments made in Ultra High Vacuum by means of X-ray and Ultraviolet Photoelectron Spectroscopy on some representative Phthalocyanine/Silicon (PC/Si) interfaces: NiPC/Si(111)7x7, PbPC/Si(100)2x1, PbPC/Si(111)7x7, CuFPC/Si(100)2x1, CuFPC/Si(111)7x7. As a first evidence, we demonstrate the adsorption without dissociation of the molecules. At the stage of deposition of few (nominally one or two ) monolayers, the experimental evidences always suggest the planar adsorption of those molecules onto the two most common reconstructions of Si(111) and Si(100). Anyway there can be evidenced interesting and enlightening spectral differences, with varying the central metal atom (lead inplace of a transition metals like Ni or Cu), the silicon substrate, or the expected strength or ad-molecule to substrate chemisorption (by substituting H with F at the four outer benzenic ring of the molecule). The importance of such studies for a more fundamental understanding of the interaction of PCs with reactive substrates is addressed in view of the fabrication of PC based gas sensors.