Protecting silicon germanium sidewall with silicon for strained silicon/silicon germanium MOSFETs
First Claim
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1. A method of fabricating a semiconductor structure, comprising the steps of:
- forming a raised source region on a substrate;
forming a raised drain region on the substrate; and
forming a first silicon layer over the raised source region and a second silicon layer over the raised drain region,wherein the first silicon layer formed over the raised source region and the second silicon layer over the raised drain region include cap portions and sidewall portions, the method further comprising a step of forming sacrificial spacers along the silicon sidewall portions.
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Abstract
Raised Si/SiGe source and drain regions include epitaxially grown silicon on SiGe sidewalls. The epi silicon prevents adverse effects of Ge during silicidation, including Ge out diffusion and silicide line breakage. The Si also increases the active area.
108 Citations
32 Claims
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1. A method of fabricating a semiconductor structure, comprising the steps of:
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forming a raised source region on a substrate; forming a raised drain region on the substrate; and forming a first silicon layer over the raised source region and a second silicon layer over the raised drain region, wherein the first silicon layer formed over the raised source region and the second silicon layer over the raised drain region include cap portions and sidewall portions, the method further comprising a step of forming sacrificial spacers along the silicon sidewall portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of fabricating a semiconductor structure, comprising:
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forming a raised source region on a substrate; forming a raised drain region on the substrate; forming a strained silicon layer on the raised source region and the raised drain region; and forming a silicon cap on the strained silicon layer. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method comprising:
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providing an SOI substrate having a patterned gate stack region comprising a gate dielectric formed on a surface thereof, providing isolation structures on sides of the patterned gate stack region; forming a gate stack on the gate dielectric; forming spacers along gate sidewalls of the gate stack; after spacer formation, forming raised source and drain regions comprising an SiGe layer; forming a silicon layer on the SiGe layer of the raised source and drain regions, wherein the silicon layer has a smaller lattice constant than Ge such that the silicon layer is strained in tension; and capping the raised drain region. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification