AVS 46th International Symposium
    Surface Science Division Wednesday Sessions
       Session SS-WeP

Paper SS-WeP20
Cesium-induced Structural Transformation from the Si(113)3x2 to the 3x1 Surface

Wednesday, October 27, 1999, 5:30 pm, Room 4C

Session: Poster Session
Presenter: C.C. Hwang, Sung Kyun Kwan University, Korea
Authors: C.C. Hwang, Sung Kyun Kwan University, Korea
K.S. An, High Energy Accelerator Organization, Japan
S.H. Kim, Sung Kyun Kwan University, Korea
C.Y. Park, Sung Kyun Kwan University, Korea
A. Kakizaki, High Energy Accelerator Organization, Japan
Correspondent: Click to Email
Adsorbates such as H, Na, Cs, etc. on the Si(113)3x2 surface are known to induce a structural transformation to the 3x1 surface. The origin, however, seems to be still unclear due to the lack of informations about the adsorption behavior of several adsorbates as well as the structure of the 3x2 surface. To investigate the adsorption behavior of cesium on the Si(113)3x2 surface at room temperature, we measured the change of workfunction, core level (Si 2p, Cs 4d), and valence band spectra with increasing cesium deposition time by using low energy electron diffraction (LEED) and synchrotron radiation photoemission spectroscopy. As previously reported, the adsorption of cesium induced the structural transformation from the Si(113)3x2 to the 3x1 surface. When cesiums adsorbed on the Si(113)3x2 surface, the workfunction decreased to about 3.2 eV and surface states from dangling bonds disappeared gradually with increasing cesium deposition time. These results indicate that cesiums adsorb preferentially on dangling bond sites at the initial stage of adsorption. We also observed that two shoulders at higher and lower binding energy than the bulk peak in Si 2p core level spectrum from the 3x2 surface disappeared by the adsorption of cesium. Rehybridized surface atoms towards sp@super 2@- and s@super 2@p@super 3@-like configurations thus seem to be changed to sp@super 3@-like ones with the structural transformation. Based on these results, we will discuss the possible origin of the cesium-induced structural transformation at room temperature.