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New surface phases for potassium adatoms on cleaved Si(111) |
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| Authors: | E J Nelson T Kendelewicz P Liu P Pianetta |
| Institution: | a Department of Physics, Stanford University, Stanford, CA 94305-4060, USA b Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305, USA c Stanford Synchrotron Radiation Laboratory, Stanford, CA 94306, USA |
| Abstract: | In a previous study (B. Reihl and K.O. Magnusson, Phys. Rev. B 42 (1990) 11 839) no change was observed in the LEED pattern from the 2 × 1 pattern of the clean Si(111) surface upon potassium adsorption. In contrast to this paper, we observe six surface phases during room temperature dosing of K on the cleaved Si(111) surface. In addition, we observe a 3 × 1 pattern on the cleaved K/Si(111) surface upon annealing. This paper will provide photographs of the new phases observed with LEED. It also will set limits on the K coverage required for these phases using results from photoemission and secondary electron cutoff measurements. Tentative models for these surfaces will be proposed. These new LEED results show a more complex interaction between K and the cleaved Si(111) surface than previously thought and hopefully will encourage further exploration of adsorption on the cleaved Si(111) surface. |
| Keywords: | Alkali metals Low energy electron diffraction LEED Low index single crystal surfaces Metal-semiconductor interfaces Silicon Surface thermodynamics (including phase transitions) Work function measurements |
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