Method of fabricating strain-silicon CMOS
First Claim
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1. A metal-oxide-semiconductor (“
- MOS”
) transistor comprising;
a channel region;
a source region;
a drain region;
stressed material in at least one of the source region and the drain region having a first edge and a second edge along one end of the stressed material, the first edge being between the second edge and the channel region so as to induce strain in the channel region sufficient to increase carrier mobility in the channel region; and
a source/drain extension region between the first edge and the channel region.
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Abstract
Recesses are formed in the drain and source regions of an MOS transistor. The recesses are formed using two anisotropic etch processes and first and second sidewall spacers. The recesses are made up of first and second recesses, and the depths of the first and second recesses are independently controllable. The recesses are filled with a stressed material to induce strain in the channel, thereby improving carrier mobility. The widths and depths of the first and second recesses are selectable to optimize strain in the channel region.
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Citations
17 Claims
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1. A metal-oxide-semiconductor (“
- MOS”
) transistor comprising;a channel region; a source region; a drain region; stressed material in at least one of the source region and the drain region having a first edge and a second edge along one end of the stressed material, the first edge being between the second edge and the channel region so as to induce strain in the channel region sufficient to increase carrier mobility in the channel region; and a source/drain extension region between the first edge and the channel region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- MOS”
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10. A metal-oxide-semiconductor (“
- MOS”
) transistor comprising;a channel region; a source region; a drain region; stressed material in at least one of the source region and the drain region having a first edge and a second edge along one end of the stressed material, the first edge being between the second edge and the channel region so as to induce strain in the channel region sufficient to increase carrier mobility in the channel region; and an isolation structure, wherein the first edge extends a first distance between the isolation structure and the channel region so as to provide a first selected stress producing a first strain in the channel region and the second edge extends a second selected distance between the isolation structure and the channel region so as to provide a second selected stress producing a second strain in the channel region. - View Dependent Claims (11, 12, 13, 14)
- MOS”
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15. A metal-oxide-semiconductor (“
- MOS”
) transistor comprising;a channel region; a source region; a drain region; stressed material in at least one of the source region and the drain region having a first edge and a second edge along one end of the stressed material, the first edge being between the second edge and the channel region so as to induce strain in the channel region sufficient to increase carrier mobility in the channel region; and a source/drain extension region, wherein the first edge is next to the source/drain extension region and the second edge is next to the source/drain extension region. - View Dependent Claims (16, 17)
- MOS”
Specification