III-V layers for N-type and P-type MOS source-drain contacts
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United States of America Patent
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Jul 19, 2016
Grant Date -
Jan 28, 2016
app pub date -
Oct 5, 2015
filing date -
Dec 20, 2011
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Abstract
Techniques are disclosed for forming transistor devices having reduced parasitic contact resistance relative to conventional devices. In some example embodiments, the techniques can be used to implement the contacts of MOS transistors of a CMOS device, where an intermediate III-V semiconductor material layer is provided between the p-type and n-type source/drain regions and their respective contact metals to significantly reduce contact resistance. The intermediate III-V semiconductor material layer may have a small bandgap (e.g., lower than 0.5 eV) and/or otherwise be doped to provide the desired conductivity. The techniques can be used on numerous transistor architectures (e.g., planar, finned, and nanowire transistors), including strained and unstrained channel structures.
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