Abstract
The adsorption of Na on a Si(001)-(2 × 1) surface has been studied by means of AES, LEED, EELS, Temperature Programmed Desorption (TPD), and work function (Δφ) measurements. Four peaks are observed in the Na TPD spectra. The lowest temperature peak corresponds to a multilayer Na structure. The observed weak coverage dependence of the Na desorption energy suggests a predominantly covalent character of the NaSi bonding. Our TPD data show that with Na in the first layer ( θ Na = 0.68), no metallization of the Na overlayer takes place. The AES, LEED, EELS and Δφ data give strong evidence of 3D clustering (Stranski-Krastanov growth mode), which at 300 K occurs for θ Na ⩾ 0.5.
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