AVS 47th International Symposium
    Semiconductors Monday Sessions
       Session SC+EL+SS-MoA

Paper SC+EL+SS-MoA8
Temporal Changes of Photoemission Spectra of the Alkali-metal-induced Ge(111) 3x1 Surface

Monday, October 2, 2000, 4:20 pm, Room 306

Session: Reactions on Semiconductors
Presenter: G. Lee, Korea Research Institute of Standards and Science
Authors: G. Lee, Korea Research Institute of Standards and Science
C. Hwang, Korea Research Institute of Standards and Science
Y. Park, Korea Research Institute of Standards and Science
S. Cho, Korea Research Institute of Standards and Science
H. Lee, Korea Research Institute of Standards and Science
E. Cho, Chonnam National University, Korea
Correspondent: Click to Email
We investigated the temporal changes of the core-level photoemission spectra of the Ge(111)3x1 reconstructed surface induced by alkali metals (Li and Na) in UHV chamber. It is found that while the spectra from the Ge(111)3x1-Na surface is hardly affected, those from the Ge(111)3x1-Li surface change significantly in time. We identify that the changes of the core-level spectra from the Ge(111)3x1-Li surface are due to the contamination by residual oxygen gas in the chamber. The contamination rate of the Ge(111)3x1-Li surface is even higher than that of the clean surface, contradicting the expectation that alkali-metal-induced 3x1 reconstruction passivates the surface against oxidation. We discuss the difference in the contamination rate between the Ge(111)3x1 surfaces induced by different alkali-metal adsorbates.