Formation of relaxed SiGe on the buffer consists of modified SiGe stacked layers by Si pre-intermixing

P. S. Chen*, S. W. Lee, M. H. Lee, C. W. Liu

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

3 引文 斯高帕斯(Scopus)

摘要

High-quality relaxed SiGe films on Si (0 0 1) have been demonstrated with a buffer layer containing modified SiGe (m-SiGe) islands in ultra-high vacuum chemical vapor deposition (UHV/CVD) system. The m-SiGe islands are smoothened by capping an appropriate amount of Si and the subsequent annealing for 10 min. This process leads to the formation of a smooth buffer layer with non-uniform Ge content. With the m-SiGe-dot multilayer as a buffer layer, the 500-nm-thick uniform Si 0.8 Ge 0.2 layers were then grown. These m-SiGe islands can serve as effective nucleation centers for misfit dislocations to relax the SiGe overlayer. Surface roughness, strain relaxation, and crystalline quality of the relaxed SiGe overlayer were found to be a function of period's number of the m-SiGe-dot multilayer. By optimizing period number in the buffer, the relaxed Si 0.8 Ge 0.2 film on the 10-period m-SiGe-dot multilayer was demonstrated to have a threading dislocation density of 2.0 × 10 5 cm -2 and a strain relaxation of 89%.

原文英語
頁(從 - 到)6076-6080
頁數5
期刊Applied Surface Science
254
發行號19
DOIs
出版狀態已發佈 - 2008 七月 30

ASJC Scopus subject areas

  • 化學 (全部)
  • 凝聚態物理學
  • 物理與天文學 (全部)
  • 表面和介面
  • 表面、塗料和薄膜

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