4.4 Article

Nonius approach for Si1-xGex/Si(001) epitaxy characterization

期刊

JOURNAL OF CRYSTAL GROWTH
卷 602, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.jcrysgro.2022.126974

关键词

A1; X-ray diffraction; Low dimensional structures; B1; Germanium silicon alloys; B2; Semiconducting materials; Semiconducting silicon compounds; Semiconducting silicon

向作者/读者索取更多资源

In Si(0 0 1)\(Si1-xGex 6-8 nm + Si 100-120 nm) x 2 (0.07 < x < 0.21) structures grown by MBE, X-ray reflectometry and diffraction were used to study the thickness variation. It was found that the second period thickness was smaller compared to the first period due to increasing misfit energy. Electron microscopy confirmed the smaller thickness of the second period. Three-waves diffraction on the forbidden reflection (002) showed different structural perfection values in two azimuthal directions. In the same sample, the reflectometry-determined average period was larger than the diffraction-determined period, and the angular distance between satellites on curves (002) corresponded to two different period values.
In Si(0 0 1)\(Si1-xGex 6-8 nm + Si 100-120 nm) x 2 (0.07 < x < 0.21) structures, grown by MBE on dislocation -free substrates and considered as nonius systems, X-ray reflectometry and diffraction on the reflection (004) revealed second period thickness decreasing compared to the first one due to misfit energy increasing. Electron microscopy of the same samples confirms the smaller thickness of the second period. Three-waves diffraction on the forbidden reflection (002) was applied to compare the structural perfection in two azimuthal directions (110): along the maximum substrate misorientation from the plane (001) and in the perpendicular direction. In the same sample with reduced photoluminescence quantum yield, it was found that the average period value determined by reflectometry (109.5 nm) was larger than that determined by diffraction on the reflection (004) (97.5 nm), and the angular distance between satellites on curves (002) corresponded to two different period values: 109.5 nm and 102 nm. Misfit dislocations are absent in the studied samples. This suggests both possible appearance of noncrystallographic defects in strained epitaxial layers and only effective thickness values cor-responding to perfect structure fragments which are determined by X-ray diffraction.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.4
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据