Abstract
In this work the effect of the chemical treatment, argon sputtering and heating on the surface of indium tin oxide (ITO) on a Polyethylene Terephthalate (PET) substrate as well as the influence of the surface chemical pretreatment on the interface formation with Nickel Phthalocyanine (NiPc) was studied. The sample was characterized by X-ray and ultraviolet photoelectron spectroscopies (XPS, UPS) for the as-received specimen, after chemical treated ex-situ by a solution of methanol, isopropanol, H2O and by a Η2Ο–Η2Ο2–ΝΗ4ΟΗ solution. In addition, it was heated up to 110 °C and after a mild argon sputtering in ultra high vacuum (UHV). The electronic structure of the interface of Nickel Phthalocyanine with ITO/PET, which has been chemically treated, was investigated. The results show that the adsorbed carbon layer affects the interface energetics. No dipole formation was observed and the alignment of the energy levels at the interface is approaching the Schottky–Mott limit. They are compared with a previous study concerning the Nickel Phthalocyanine interfaced with sputtered clean ITO surface on glass.
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