Manipulation of ZnO work function upon deposition of 4-TBP molecule

• ZnO is a multi dimensional material, which can be used as semiconductor, as pigment (zinc white) for coloring paper as sensor for hydrogen gas and has attracted much attention as a potential complement or even substitute to GaN. Furthermore, since it is photochemically stable, transparent in the visible region and it is largely available in the single crystal form it profitably can be used as an electrode and/or n-type semiconductor in diodes and photovoltaic cells. In order to optimize the performance of ZnO is such applications one need to tune zinc oxide’s work function (and surface energy), which potentially can be achieved by adsorption of thin interfacial layers. In this study, we investigated modification of work function of zinc oxide’s polar surfaces, ZnO(0001), and the interactions between those surfaces and monolayer and multilayer of an organic molecule, belonging to Self Assembled Molecules (SAM) family. We observed similar final work function of Zn-terminated and O-terminated zinc oxide after one monolayer deposition by SAM molecule despite the fact that Zn-terminated surfaces exhibits different chemical properties and work function than O-terminated surfaces.

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