High-resolution core-level study of the Ca/Si(1 1 1)-(2×1) surface

• Published in: Thin solid films Vol. 428; no. 1; pp. 115 - 118
• Main Authors: Sakamoto, Kazuyuki, Takeyama, Wakaba, Zhang, H.M., Uhrberg, R.I.G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 20.03.2003; Elsevier Science
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Fysik; Low-energy electron diffraction; Photoelectron spectroscopy; Physics; Solid surfaces and solid-solid interfaces; Surface structure; Surface structure and topography; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); TECHNOLOGY; TEKNIKVETENSKAP; Low-energy electron diffraction; Photoelectron spectroscopy; Surface structure; Calcium; Nonmetals; Adsorption structure; LEED; Experimental study; Thermal annealing; High-resolution methods; Synchrotron radiation; Structural models
• ISSN: 0040-6090; 1879-2731; 1879-2731
• DOI: 10.1016/S0040-6090(02)01232-4

We have investigated the geometric structure of the Ca/Si(1 1 1)-(2×1) surface using low-energy electron diffraction (LEED) and high-resolution core-level photoelectron spectroscopy. A clear (2×1) periodicity was observed in LEED after annealing the (7×1) phase formed at room temperature in LEED. In the Si 2p core-level spectra, three surface components were observed. By considering the energy shift and intensity of each surface component and the Ca 3p core-levels of the two phases, we regard the (2×1) phase to be formed by π-bonded Seiwatz Si chains with a Ca coverage of 0.5 ML.