THEFeULTRATHIN FILM ONZnO(000-1)SURFACE: GROWTH, STRUCTURE, AND INTERACTION

Guo-Dong Wang, Fa-Qiang Xu (), Wang Zhang, Wen-Hua Zhang and Zong-Mu Li
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Guo-Dong Wang: National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
Fa-Qiang Xu: National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
Wang Zhang: National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
Wen-Hua Zhang: National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China
Zong-Mu Li: National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China

Surface Review and Letters (SRL), 2008, vol. 15, issue 03, 295-300

Abstract: We report the electronic structure of the interface of the ultrafilmFefilm with theO-terminatedZnO(000-1)polar surface studied by synchrotron radiation photoemission. It was found thatFegrows in a Stranski–Krastanov mode. The turning point of the growth mode was at theFecoverage of ~2 Å. At low coverage, about 1 ML (monolayer) of iron (ca.1.5 Å) was oxidized by the terminative oxygen atoms on theZnO(000-1)surface. Analysis of the valence band and theFe3pphotoemission spectra indicates that below 2 Å coverage, onlyFe2+species could be detected at theFe/ZnOinterface, after that the formation of a metallic iron overlayer was observed. A sharp Fermi edge appeared at 5.1 Å coverage, indicating the formation of the bulk metallicFefilm. Furthermore, work function of the sample decreased to a minimum of 4.5 eV at 0.2 ÅFe, and then to 4.9 eV with the formation of a dipole layer at the interface.

Keywords: Fe/ZnOinterface; synchrotron radiation photoemission spectroscopy (SRPES); work function (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X0801138X

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