Growth of Pb-Phthalocyanine Thin Films on MoS2 Surfaces Studied by Means of Low-Energy Electron Transmission Spectroscopy

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Abstract
Low-energy electron transmission (LEET) spectroscopy was used to study the growth of Pb-phthalocyanine (PbPc) thin films on MoS2 single crystal surfaces. We observed LEET features typical of the ultrathin films which were prepared by direct molecular-beam deposition of PbPc molecules as well as by thinning thicker films by heat treatment. The dependence of the work function of the film on the film thickness gave a minimum value for the ultrathin films which exhibit LEET features different from those for thicker films. The results indicate that the ultrathin film consists of a monolayer of PbPc molecules and LEET spectroscopy is useful in observing monolayer growth of functional organic molecules. Furthermore, the effects of heat treatment and aging of the PbPc films are investigated.

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