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Issue 39, 2018
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Structural stability and electronic properties of alkaline-earth metal induced Si(111)-(3 × 2) surfaces

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Abstract

Alkaline-earth metal (Ca, Sr, and Ba) induced Si(111)-(3 × 2) honeycomb chain-channel (HCC) surfaces have been systematically studied by means of ab initio calculations. The large adsorption energy and anisotropic diffusion energy barriers ensure the high structural stability of the one-dimensional HCC structure. Electronic band structures and band-decomposed charge density distributions reveal that the first conduction band and the third valence band level are contributed by the surface Si and metal atoms, while the top first and second valence bands are caused by the bulk silicon atoms. These results identify a larger surface band gap of 1.65–1.68 eV and provide an excellent explanation for the recent experimental observations of a band gap of 1.7 eV for the Sr/Si(111)-(3 × 2) HCC surface.

Graphical abstract: Structural stability and electronic properties of alkaline-earth metal induced Si(111)-(3 × 2) surfaces

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Publication details

The article was received on 09 Jul 2018, accepted on 10 Sep 2018 and first published on 10 Sep 2018


Article type: Paper
DOI: 10.1039/C8CP04323J
Citation: Phys. Chem. Chem. Phys., 2018,20, 25235-25239
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    Structural stability and electronic properties of alkaline-earth metal induced Si(111)-(3 × 2) surfaces

    J. Chai, Z. Li, L. Xu and J. Wang, Phys. Chem. Chem. Phys., 2018, 20, 25235
    DOI: 10.1039/C8CP04323J

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