Microstructural studies of reactive ion etched silicon
作者:
S. J. Jeng,
G. S. Oehrlein,
期刊:
Applied Physics Letters
(AIP Available online 1987)
卷期:
Volume 50,
issue 26
页码: 1912-1914
ISSN:0003-6951
年代: 1987
DOI:10.1063/1.97684
出版商: AIP
数据来源: AIP
摘要:
The structures of Si near‐surface damage induced after the removal of a thick SiO2layer on Si using reactive ion etching with various etching gases were studied by transmission electron microscopy. Cross‐sectional micrographs showed the presence of a fluorocarbon film on the Si surface after the SiO2layer is etched away. No extended defects were observed in Si etched utilizing pure CF4or CF4/20% H2etching gas, even after a 25‐min overetch into Si. For a CF4/40% H2etching gas, no extended lattice defects were evident for overetch times of up to 5 min. However, extensive damage was found in the Si surface layer after a 10‐min or longer overetch. This extensive damage consists of {111} planar defects distributing underneath the Si surface to a depth of 300 A˚. The planar defects are highly decorated by impurities, likely H and possibly C, F. A pure H2etching gas was found to introduce a heavily damaged layer and a high density of extended defects near the Si surface after only a 5‐min overetch. These observations indicate that H ion bombardment plays an important role in the formation of Si near‐surface damage during reactive ion etching.
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