Gate spacer structure of FinFET device
First Claim
1. A device comprising:
- a gate stack on sidewalls and over a top surface of a semiconductor fin, the gate stack having a first sidewall and a second sidewall opposite to the second sidewall;
a first spacer structure along the first sidewall of the gate stack, the first spacer structure comprising;
a first spacer, a first portion of the first spacer extending along the first sidewall of the gate stack, a second portion of the first spacer extending laterally away from the first sidewall of the gate stack and over the top surface of the semiconductor fin; and
a second spacer over the first spacer, the second spacer partially covering a top surface of the second portion of the first spacer; and
a second spacer structure along the second sidewall of the gate stack, the second spacer structure comprising;
a third spacer, a first portion of the third spacer extending along the second sidewall of the gate stack, a second portion of the third spacer extending laterally away from the second sidewall of the gate stack and over the top surface of the semiconductor fin; and
a fourth spacer over the third spacer, the fourth spacer fully covering a top surface of the second portion of the third spacer.
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Abstract
A method includes forming a fin extending above an isolation region. A sacrificial gate stack having a first sidewall and a second sidewall opposite the first sidewall is formed over the fin. A first spacer is formed on the first sidewall of the sacrificial gate stack. A second spacer is formed on the second sidewall of the sacrificial gate stack. A patterned mask having an opening therein is formed over the sacrificial gate stack, the first spacer and the second spacer. The patterned mask extends along a top surface and a sidewall of the first spacer. The second spacer is exposed through the opening in the patterned mask. The fin is patterned using the patterned mask, the sacrificial gate stack, the first spacer and the second spacer as a combined mask to form a recess in the fin. A source/drain region is epitaxially grown in the recess.
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Citations
20 Claims
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1. A device comprising:
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a gate stack on sidewalls and over a top surface of a semiconductor fin, the gate stack having a first sidewall and a second sidewall opposite to the second sidewall; a first spacer structure along the first sidewall of the gate stack, the first spacer structure comprising; a first spacer, a first portion of the first spacer extending along the first sidewall of the gate stack, a second portion of the first spacer extending laterally away from the first sidewall of the gate stack and over the top surface of the semiconductor fin; and a second spacer over the first spacer, the second spacer partially covering a top surface of the second portion of the first spacer; and a second spacer structure along the second sidewall of the gate stack, the second spacer structure comprising; a third spacer, a first portion of the third spacer extending along the second sidewall of the gate stack, a second portion of the third spacer extending laterally away from the second sidewall of the gate stack and over the top surface of the semiconductor fin; and a fourth spacer over the third spacer, the fourth spacer fully covering a top surface of the second portion of the third spacer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device comprising:
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a gate stack on sidewalls and over a top surface of a semiconductor fin, the gate stack having a first sidewall and a second sidewall opposite to the second sidewall; a first spacer structure on the first sidewall of the gate stack, the first spacer structure comprising; a first spacer on the first sidewall of the gate stack; and a second spacer adjacent the first spacer, the first spacer being interposed between the second spacer and the first sidewall of the gate stack, a first portion of the first spacer extending laterally away from the first sidewall of the gate stack and beyond a sidewall of the second spacer, the sidewall of the second spacer facing away from the gate stack; and a second spacer structure on the second sidewall of the gate stack, the second spacer structure comprising; a third spacer on the second sidewall of the gate stack; and a fourth spacer adjacent the third spacer, the third spacer being interposed between the fourth spacer and the second sidewall of the gate stack, a first portion of the third spacer extending laterally away from the second sidewall of the gate stack to a sidewall of the fourth spacer, the sidewall of the fourth spacer facing away from the gate stack. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A device comprising:
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a fin over a substrate; a gate stack along sidewalls and over a top surface of a channel region of the fin, the gate stack having a first sidewall and a second sidewall opposite to the second sidewall; a first gate spacer structure along the first sidewall of the gate stack, the first gate spacer structure comprising a first gate spacer, a first portion of the first gate spacer extending along the first sidewall of the gate stack, a second portion of the first gate spacer extending laterally away from the first sidewall of the gate stack and over the top surface of the fin; a second gate spacer structure along the second sidewall of the gate stack, the second gate spacer structure comprising a second gate spacer, a first portion of the second gate spacer extending along the second sidewall of the gate stack, a second portion of the second gate spacer extending laterally away from the second sidewall of the gate stack and over the top surface of the fin, a width of the second portion of the second gate spacer being less than a width of the second portion of the first gate spacer; a first epitaxial region adjacent the first gate spacer structure; and a second epitaxial region adjacent the second gate spacer structure. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification