Multilayer step formation after As adsorption on Si (100): Nucleation of GaAs on vicinal Si
作者:
P. R. Pukite,
P. I. Cohen,
期刊:
Applied Physics Letters
(AIP Available online 1987)
卷期:
Volume 50,
issue 24
页码: 1739-1741
ISSN:0003-6951
年代: 1987
DOI:10.1063/1.97733
出版商: AIP
数据来源: AIP
摘要:
We have used reflection high‐energy electron diffraction to characterize the initial surface of misoriented Si (100) and then to follow the nucleation of GaAs. Measurement of the diffracted intensity along the length of the specular streak shows sharp structure due to an ordered array of steps. The initial surface contains monolayer steps. However, after exposing to an As4flux above 650 °C, the surface morphology changes to multilayer steps with four times the original period. In contrast, below 650 °C, surface migration is inhibited and monolayer steps are retained. Subsequent growth of GaAs on either the monolayer‐ or multilayer‐stepped surfaces yields single domain films. However, GaAs grown on the monolayer steps is misoriented toward the (111)Awhile GaAs grown on the multilayer steps is misoriented toward the (111)B.
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