Enhanced growth of low-resistivity titanium silicides on epitaxial Si0.7Ge0.3 on (001)Si with a sacrificial amorphous Si interlayer

Enhanced growth of low-resistivity self-aligned titanium silicides on epitaxial Si0.7Ge0.3 with a sacrificial amorphous Si (a-Si) interlayer has been achieved. The a-Si layer with appropriate thickness was found to prevent Ge segregation, decrease the growth temperature, as well as maintain the interface flatness and morphological stability in forming low-resistivity C54-TiSi2 on Si0.7Ge0.3 grown by molecular beam epitaxy. The process promises to be applicable to the fabrication of high-speed Si–Ge devices.