Ultra-high vacuum deposition of sodium on indium monoselenide: Intercalation or chemical reaction?

被引：8
作者：
Fargues, D [1 ]
Tyuliev, G [1 ]
Brojerdi, G [1 ]
Eddrief, M [1 ]
Balkanski, M [1 ]
机构：
[1] BULGARIAN ACAD SCI,INST GEN & INORGAN CHEM,BU-1113 SOFIA,BULGARIA
来源：
SURFACE SCIENCE | 1997年 / 370卷 / 2-3期
关键词：
alkali metals; indium selenide; X-ray photoelectron spectroscopy;
D O I：
10.1016/S0039-6028(96)00967-3
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A X-ray photoelectron spectroscopy (XPS) study of the behaviour of sodium films deposited in ultra-high vacuum on InSe single crystal or thin epitaxial films at room temperature and upon moderate annealings (up to 475 K) is reported Major changes affect the substrate spectra, in particular indium, and clearly show the influence of the substrate morphology. For the InSe single-crystal substrate, annealing tends to restore the initial InSe surface as shown by XPS and RHEED, while for InSe films, no restoration occurs. In both cases, sodium has a partial ionic character and two phases are evidenced: one, [(NaalphaInSebeta)-Se-0], where indium is close to metal or covalent indium, and the other, Na-alpha,[InSe], where indium is more ionic close to InSe. The results emphasize that interdiffusion and fast chemical reaction predominate for the thin film substrate; for the bulk substrate, interfacial reaction and surface diffusion are competitive.
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页码：201 / 208
页数：8
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