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• W2041640624 endingPage "1454" @default.
• W2041640624 startingPage "1448" @default.
• W2041640624 abstract "The effects of boron on Co and Si1−xGex interfacial reaction were studied. Undoped and in situ boron-doped strained Si0.91Ge0.09 and Si0.86Ge0.14 layers prepared at 550 °C by an ultrahigh vacuum chemical vapor deposition system were subjected to Co silicidation at various rapid thermal annealing (RTA) temperatures ranging from 500 to 1000 °C. The resulting films were characterized by a sheet resistance measurement, Auger electron spectroscopy, x-ray diffractometry (XRD), high resolution x-ray diffractometry, secondary ion mass spectroscopy, scanning electron microscopy, and transmission electron microscopy. Seen from XRD spectroscopy, a Co(Si1−yGey) cubic structure was formed with RTAs ranging from 500 to 700 °C. For boron-doped samples, the CoGe fraction in Co(Si1−yGey) was less than that in undoped samples, indicating that boron atoms retarded the incorporation of Ge into the Co(Si1−yGey) ternary phase. It also led to a large Ge pileup at the interface between the Co-rich and silicidation regions. On the other hand, from the high resolution x-ray spectra, the presence of boron led to less relaxation of the strained Si1−xGex lattice. It is the first time that small boron atoms inhibiting the relaxation of the Si1−xGex layer during silicidation was observed. Furthermore, from the sheet resistance measurement, the formation of CoSi2 was found to be slightly retarded in boron-doped samples, due probably to the decrease of Co or Si diffusivities as a result of boron accumulation at the Co/SiGe reaction interface. At temperatures above 800 °C, CoSi2 formed and Ge segregated to the silicide boundaries and the upper reaction region was discovered. These phenomena caused by B dopants are explained in detail." @default.
• W2041640624 created "2016-06-24" @default.
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• W2041640624 date "2000-07-01" @default.
• W2041640624 modified "2023-10-18" @default.
• W2041640624 title "Study of boron effects on the reaction of Co and Si1−xGex at various temperatures" @default.
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• W2041640624 doi "https://doi.org/10.1116/1.582368" @default.
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