Method to induce strain in finFET channels from an adjacent region
First Claim
Patent Images
1. A device, comprising:
- a substrate having a first surface and a second surface;
a base structure of a first material on the first surface of the substrate;
a fin structure of a second material on the base structure, the first material being different than the second material, the fin structure having a first surface on the base structure and a second surface opposite the first surface;
a constraining material on the base structure and the fin structure, the constraining material having a first surface on the substrate and a second surface opposite the first surface, the second surface of the constraining material being between the first and second surfaces of the fin structure; and
an insulating layer on the second surface of the substrate.
2 Assignments
0 Petitions
Accused Products
Abstract
Methods and structures for forming strained-channel finFETs are described. Fin structures for finFETs may be formed using two epitaxial layers of different lattice constants that are grown over a bulk substrate. A first thin, strained, epitaxial layer may be cut to form strain-relieved base structures for fins. The base structures may be constrained in a strained-relieved state. Fin structures may be epitaxially grown in a second layer over the base structures. The constrained base structures can cause higher amounts of strain to form in the epitaxially-grown fins than would occur for non-constrained base structures.
-
Citations
20 Claims
-
1. A device, comprising:
-
a substrate having a first surface and a second surface; a base structure of a first material on the first surface of the substrate; a fin structure of a second material on the base structure, the first material being different than the second material, the fin structure having a first surface on the base structure and a second surface opposite the first surface; a constraining material on the base structure and the fin structure, the constraining material having a first surface on the substrate and a second surface opposite the first surface, the second surface of the constraining material being between the first and second surfaces of the fin structure; and an insulating layer on the second surface of the substrate. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A device, comprising:
-
a substrate; a first base structure of a first material; a second base structure of a second material that is different than the first material; a first fin structure of a third material that is different than the first material and the second material, the first base structure being between the first fin structure and the substrate; a second fin structure of the third material, the second base structure being between the second fin structure and the substrate; a first constraining structure and a second constraining structure on the first base structure and the second base structure, respectively; and an insulating layer adjacent to the first and second constraining structures on the substrate. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A device comprising:
-
a substrate; a base structure of a first material on the substrate; a fin structure of a second material on the base structure, the second material being different than the first material; a constraining material on the base structure; a dielectric layer on the constraining material and the substrate; and an insulating layer on the dielectric layer. - View Dependent Claims (17, 18, 19, 20)
-
Specification