Salicide formation method
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United States of America Patent
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Jul 12, 2005
Grant Date -
Oct 14, 2004
app pub date -
Apr 8, 2003
filing date -
Apr 8, 2003
priority date (Note) -
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Abstract
A method of forming a salicide on a semiconductor device includes depositing a first refractory metal layer over a silicon region of a substrate, depositing a near-noble metal layer over the first refractory metal layer, and depositing a second refractory metal layer over the near-noble metal layer. The semiconductor device is annealed in a first annealing process to form a silicide layer abutting the doped region of the semiconductor device. Un-reacted portions of the near-noble metal layer and the second refractory metal layer are removed. The device may be annealed in an optional second annealing process to convert the silicide layer to a low resistance phase silicide material. Junction leakage and bridging are minimized or eliminated by embodiments of the present invention, and a smoother silicided surface is achieved.
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