High threshold voltage FET with the same fin height as regular threshold voltage vertical FET
First Claim
1. A method of forming a semiconductor device, the method comprising:
- forming a first vertical fin with a first gate stack and a second vertical fin with a second gate stack, wherein the second vertical fin has a hardmask on top, and wherein the first vertical fin is adjacent to a first bottom source or drain (S/D) region and the second vertical fin is adjacent to a second bottom S/D region;
reducing the first gate stack to a first gate length and the second gate stack to a second gate length, the second gate length being greater than the first gate length because of the hardmask;
removing the hardmask; and
forming a first top S/D region adjacent to the first vertical fin and a second top S/D region adjacent to the second vertical fin.
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Abstract
A technique relates to a semiconductor device. A first vertical fin is formed with a first gate stack and a second vertical fin with a second gate stack. The second vertical fin has a hardmask on top. The first vertical fin is adjacent to a first bottom source or drain (S/D) region and the second vertical fin is adjacent to a second bottom S/D region. The first gate stack is reduced to a first gate length and the second gate stack to a second gate length, the second gate length being greater than the first gate length because of the hardmask. The hardmask is removed. A first top S/D region is adjacent to the first vertical fin and a second top S/D region is adjacent to the second vertical fin.
21 Citations
11 Claims
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1. A method of forming a semiconductor device, the method comprising:
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forming a first vertical fin with a first gate stack and a second vertical fin with a second gate stack, wherein the second vertical fin has a hardmask on top, and wherein the first vertical fin is adjacent to a first bottom source or drain (S/D) region and the second vertical fin is adjacent to a second bottom S/D region; reducing the first gate stack to a first gate length and the second gate stack to a second gate length, the second gate length being greater than the first gate length because of the hardmask; removing the hardmask; and forming a first top S/D region adjacent to the first vertical fin and a second top S/D region adjacent to the second vertical fin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification