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

Shu Nakaharai, Tsutomu Tezuka, Naoharu Sugiyama, Yoshihiko Moriyama, Shin-ichi Takagi

doi:10.1063/1.1622442

<jats:p>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/SiO2 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.</jats:p>

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

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

書誌事項

この論文をさがす

説明

収録刊行物

被引用文献 (51)*注記

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書き出し

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