Atomically controlled processing in silicon-based CVD epitaxial growth

Junichi Murota, Masao Sakuraba, Bernd Tillack

研究成果: Article査読

7 被引用数 (Scopus)

抄録

One of the main requirements for Si-based ultrasmall device is atomic-order control of process technology. Here, we show the concept of atomically controlled processing for group IV semiconductors based on atomic-order surface reaction control in Si-based CVD epitaxial growth. Self-limiting formation of 1-3 atomic layers of group IV or related atoms after thermal adsorption and reaction of hydride gases on Si1-xGex(100) (x = 0-1) surface are generalized based on the Langmuir-type model. Moreover, Si-based epitaxial growth on N, P or C atomic layer formed on Si1-xGe x100 surface is achieved at temperatures below 500 °C. N atoms of about 4×1014 cm-2 are buried in the Si epitaxial layer within about 1 nm thick region. In the Si0.5Ge0.5 epitaxial layer, N atoms of about 6×1014 cm-2 are confined within about 1.5 nm thick region. The confined N atoms in Si 1-xGex preferentially form Si-N bonds. For unstrained Si cap layer grown on top of the P atomic layer formed on Si1-xGe x100with P atomic amount of below about 4×1014 cm-2 using Si2H6 instead of SiH4, the incorporated P atoms are almost confined within 1 nm around the heterointerface. It is found that tensile-strain in the Si cap layer growth enhances P surface segregation and reduces the incorporated P atomic amount around the heterointerface. Heavy C atomic-layer doping suppresses strain relaxation as well as intermixing between Si and Ge at the nm-order thick Si1-xGex /Si heterointerface. These results open the way to atomically controlled technology for ULSIs.

本文言語English
ページ(範囲)8348-8353
ページ数6
ジャーナルJournal of Nanoscience and Nanotechnology
11
9
DOI
出版ステータスPublished - 2011 9月 1

ASJC Scopus subject areas

  • バイオエンジニアリング
  • 化学 (全般)
  • 生体医工学
  • 材料科学(全般)
  • 凝縮系物理学

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