AVS 49th International Symposium
    Surface Science Thursday Sessions
       Session SS+EL-ThM

Paper SS+EL-ThM9
Core-level Spectroscopy Study of the Clean c(4x2) and the Hydrogenated 2x1-H Phases on the 3C-SiC(001) Surface

Thursday, November 7, 2002, 11:00 am, Room C-110

Session: Structure of Semiconductor Surfaces & Interfaces
Presenter: L.S.O. Johansson, Karlstad University, Sweden
Authors: L.S.O. Johansson, Karlstad University, Sweden
S.M. Widstrand, Karlstad University, Sweden
K.O. Magnusson, Karlstad University, Sweden
M.I. Larsson, Karlstad University, Sweden
H.W. Yeom, Yonsei University, Korea
S. Hara, AIST, Japan
S. Yoshida, AIST, Japan
Correspondent: Click to Email
We report a core-level spectroscopy investigation of the clean Si-terminated 3C-SiC(001)-c(4x2) surface and the hydrogenated 3C-SiC(001)2x1-H surface. The 2x1-H surface was formed by exposing the clean c(4x2) surface to excited hydrogen gas. Desorption of the hydrogen at 900° C led to the restoration of the c(4x2) periodicity. Higher hydrogen exposures led to the formation of diffuse 1x1 and mixed 3x1/2x1 phases, as observed by low-energy electron diffraction (LEED). This behaviour is remarkably similar to hydrogen adsorption on the Si(001)2x1 surface. Si 2p core-level spectra from the clean c(4x2) surface displayed the characteristic surface peak shifted by 1.4 eV to lower binding energy, which in previous studies has been attributed to Si adatoms on top of a Si-terminated surface.@footnote 1,2@ The formation of the 2x1-H surface lead to dramatic changes in the Si 2p lineshape, where the main surface components now appeared closer to the bulk peak. Detailed decompositions of the spectra are presented and are discussed in relation to the suggested structural models for the c(4x2) surface@footnote 3,4@ and to previous core-level studies.@footnote 1,5@. @FootnoteText@ @footnote 1@ M.L. Shek, Surf. Sci. 349, 317 (1996).@footnote 2@ A. Catellani, G. Galli, and F. Gygi, Appl. Phys. Lett. 72, 1902 (1998). @footnote 3@ P. Soukiassian, F. Semond, L. Douillard, A. Mayne, G. Dujardin, L. Pizzagalli, and C. Joachim, Phys. Rev. Lett. 78, 907 (1997).@footnote 4@ W. Lu, P. Krüger, J. Pollmann, Phys. Rev. Lett. 81, 2292 (1998).@footnote 5@ V. Yu. Aristov, H. Enriquez, V. Derycke, P. Soukiassian, G. Le Lay, C. Grupp, and A. Taleb-Ibrahimi, Phys. Rev. B 60, 16553 (1999). .