Device having enhanced stress state and related methods
View Patent ↗The present invention provides a semiconductor device having dual nitride liners, which provide an increased transverse stress state for at least one FET and methods for the manufacture of such a device. A first aspect of the invention provides a method for use in the manufacture of a semiconductor device comprising the steps of applying a first silicon nitride liner to the device and applying a second silicon nitride liner adjacent the first silicon nitride liner, wherein at least one of the first and second silicon nitride liners induces a transverse stress in a silicon channel beneath at least one of the first and second silicon nitride liner.
1. A semiconductor device comprising:
a first silicon nitride liner;
a second silicon nitride liner laterally adjacent the first silicon nitride liner; and
a silicon channel beneath a portion of the second silicon nitride liner;
wherein the first silicon nitride liner induces a transverse stress in a portion of the silicon channel beneath the second silicon nitride liner that is additive in the same direction to the stress induced by the second silicon nitride liner.
2. The device of claim 1 , wherein the first silicon nitride liner is a tensile silicon nitride.
3. The device of claim 1 , wherein the second silicon nitride liner is a compressive silicon nitride.
4. The device of claim 1 , wherein the induced transverse stress is a tensile stress under the second silicon nitride liner and compressive stress under the first silicon nitride liner.
5. The device of claim 1 , wherein the induced stress improves a function of a p-channel field effect transistor beneath the second silicon nitride liner.
6. The device of claim 5 , wherein the function is at least one of electron transport and hole transport.
7. A semiconductor device comprising:
a first silicon nitride liner;
a p-channel field effect transistor;
a second silicon nitride liner residing substantially atop the p-channel field effect transistor, and adjacent the first silicon nitride liner; and
a silicon channel residing substantially beneath the p-channel field effect transistor,
wherein the first silicon nitride liner lies substantially parallel to a source-to-drain axis of the p-channel field effect transistor and induces a stress in the silicon channel substantially perpendicular to a source-to-drain axis of the p-channel field effect transistor the stress induced by the first silicon nitride liner being additive in the same direction to a stress induced by the second silicon nitride liner.
8. The device of claim 7 , wherein the first silicon nitride liner is a tensile silicon nitride.
9. The device of claim 7 , wherein the second silicon nitride liner is a compressive silicon nitride.
10. The device of claim 7 , wherein the induced stress is a tensile stress.
11. The device of claim 7 , wherein the induced stress improves a function of the p-channel field effect transistor.
12. The device of claim 11 , wherein the function is at least one of electron transport and hole transport.
13. A semiconductor device comprising:
a first silicon nitride liner;
a second silicon nitride liner;
a p-channel field effect transistor;
a third silicon nitride liner residing substantially atop the p-channel field effect transistor, and adjacent the first and second silicon nitride liners; and
a silicon channel residing substantially beneath the p-channel field effect transistor,
wherein each of the first and second silicon nitride liners lies substantially parallel to a source-to-drain axis of the p-channel field effect transistor and induces a stress in the silicon channel substantially perpendicular to a source-to-drain axis of the p-channel field effect transistor, the stresses induced by the first and second nitride liners being additive in the same direction to the stress induced by the third silicon nitride liner.
14. The device of claim 13 , wherein each of the first and second silicon nitride liners is a tensile silicon nitride.
15. The device of claim 13 , wherein the third silicon nitride liner is a compressive silicon nitride.
16. The device of claim 13 , wherein the induced stress is a tensile stress.
17. The device of claim 13 , wherein the induced stress improves a function of the p-channel field effect transistor.