Alkali metal adsorption on the Si(111)7×7 surface

1 March 1991

journal article
research article
Published by American Vacuum Society in Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures

Vol. 9 (2) , 745-747
https://doi.org/10.1116/1.585546

Abstract

Alkali metal (K, Cs) adsorption on the Si(111)7 X 7 surface has been investigated with the field ion-scanning tunneling microscope. At the initial coverage, K(Cs) atoms adsorb mainly at the on-top site of the center adatoms and are ionized. Some of the adsorbed alkali metal atoms form clusters (often trimers), which have more covalent character with back-donation of the charge distribution, and those clusters become the dominant species on the surface with increasing coverage. When the Si(111)-K surface is heated at 300-degrees-C, a new 1 X 3 phase grows as islands which are made of incommensurate linear chains with misfit defects.

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