Electronic states and growth modes of Zn atoms deposited on Cu(111) studied by XPS, UPS and DFT

Publication date: September 2017
Source:Surface Science, Volume 663
Author(s): Takanori Koitaya, Yuichiro Shiozawa, Yuki Yoshikura, Kozo Mukai, Shinya Yoshimoto, Siro Torii, Fahdzi Muttaqien, Yuji Hamamoto, Kouji Inagaki, Yoshitada Morikawa, Jun Yoshinobu
Electronic states and growth modes of the Zn-deposited Cu(111) surface at 300K were quantitatively studied using core-level and valence photoelectron spectroscopies. Both Cu 2p and Zn 2p core-levels shifted to higher binding energy with increasing the amount of deposited Zn up to multilayer. The origin of the core-level shift of Cu 2p was further investigated by density functional theory calculations; the shift of the Cu 2p peak results from the change in the effective electrostatic potential (initial state effect) caused by the formation of Zn-Cu surface alloy, and the increase of coordination numbers of surface Cu atoms by Zn overlayer. The observed valence photoelectron spectra show the formation of the two atomic-layer Zn-Cu alloy up to the Zn coverage of 1ML, followed by the formation of three-dimensional Zn islands on the alloyed surface at 300K.

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