Large Unit Cell Superstructures on Hexagonal SiC-Sufaces Studied by LEED, AES 
and STM

Starke, U.; Franke, M.; Bernhardt, J.; Schardt, J.; Reuter, Karsten; Heinz, k.

doi:10.4028/www.scientific.net/MSF.264-268.321

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Large Unit Cell Superstructures on Hexagonal SiC-Sufaces Studied by LEED, AES and STM

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Starke, U., Franke, M., Bernhardt, J., Schardt, J., Reuter, K., & Heinz, k. (1998). Large Unit Cell Superstructures on Hexagonal SiC-Sufaces Studied by LEED, AES and STM. Materials Science Forum, 264-268, 321-326. doi:10.4028/www.scientific.net/MSF.264-268.321.

Cite as: https://hdl.handle.net/21.11116/0000-000A-F589-7

Abstract

The atomic structure of reconstruction phases on silicon rich hexagonal SiC surfaces was investigated using low-energy electron diffraction (LEER), scanning tunneling microscopy (STM) and Auger electron spectroscopy (AES). A silicon adatom geometry is favored for the (√3x√3)R30° phase in agreement with recent total energy calculations. On the (3x3) periodic surface a novel type of reconstruction mechanism is observed which is characterized by a single tetrahedral adatom cluster on top of a full silicon adlayer. A twist motion is induced in both adcluster and adlayer, resulting in clover-like pentamer rings which provide a planar three-fold bonded coordination within the adlayer. The (6√3x6√3)R30° structure which often displays a quasi "6x6" corrugation in STM contains three atomic rings per unit cell with slightly different size.