INTERACTION OF POTASSIUM WITH SI(100)2X1

被引:25
作者
CASTRO, GR [1 ]
PERVAN, P [1 ]
MICHEL, EG [1 ]
MIRANDA, R [1 ]
WANDELT, K [1 ]
机构
[1] UNIV BONN,INST PHYS & THEORET CHEM,W-5300 BONN 1,GERMANY
关键词
D O I
10.1016/0042-207X(90)90417-W
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Controversy exists about the question as to whether the K{single bond}Si bond is fully ionic in contrast to the interaction mechanism between potassium and metal surfaces. Full charge transfer would result in a metallic silicon surface, while only fractional charge transfer would result in a metallic K-overlayer as in the case of K adsorption on metal substrates. Using work function change, thermal desorption and uv photoemission measurements for potassium as well as coadsorbed oxygen we have determined that the potassium overlayer on Si(100)2 × 1 behaves differently above and below 0.5 ML; at θ{symbol}k ≥ 0.5 ML the behavior of the K overlayer is similar to that of bulk potassium. These experimental results are consistent with a metallic character of the K overlayer above 0.5 ML.†Present address: Institute of Physics of the University, Zagreb, Yugoslavia.‡Present address: Dept of Condensed Matter Physics, Universidad Autonoma, Madrid, Spain. © 1990 Pergamon Press plc.
引用
收藏
页码:564 / 566
页数:3
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