TITLE

Characterization of 7-nm-thick strained Ge-on-insulator layer fabricated by Ge-condensation technique

AUTHOR(S)
Nakaharai, Shu; Tezuka, Tsutomu; Sugiyama, Naoharu; Moriyama, Yoshihiko; Takagi, Shin-ichi
PUB. DATE
October 2003
SOURCE
Applied Physics Letters;10/27/2003, Vol. 83 Issue 17, p3516
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A strained Ge-on-insulator (GOI) structure with a 7-nm-thick Ge layer was fabricated for applications to high-speed transistors. The GOI layer was formed by thermal oxidation of a strained SiGe layer grown epitaxially on a silicon-on-insulator (SOI) wafer. In transmission electron microscopy measurements, the obtained GOI layer exhibited a single-crystal structure with the identical orientation to an original SOI substrate and a smooth Ge/SiO[sub 2] interface. The rms of the surface roughness of the GOI layer was evaluated to be 0.4 nm by atomic force microscopy. The residual Si fraction in the GOI layer was estimated to be lower than the detection limit of Raman spectroscopy of 0.5% and also than the electron energy loss spectroscope measurements of 3%. It was found that the obtained GOI layer was compressively strained with a strain of 1.1%, which was estimated by the Raman spectroscopy. Judging from the observed crystal quality and the strain value, this technique is promising for fabrication of high-mobility strained Ge channel of high-performance GOI metal–insulator–semiconductor (MIS) transistors. © 2003 American Institute of Physics.
ACCESSION #
11123020

 

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