Adjacent device isolation

1. An integrated circuit (IC) device, comprising:

a first active transistor of a first-type in a first-type region, having a first-type work function material and a channel dopant concentration in an active portion of the first active transistor, comprising a first monolithic fin and a first sub-fin, the first sub-fin integral to a substrate; and

a first isolation transistor of the first-type in the first-type region having a second-type work function material and the channel dopant concentration in an active portion of the first isolation transistor, comprising a second monolithic fin and a second sub-fin, the second sub-fin being integral to the substrate, the first isolation transistor being adjacent to the first active transistor.

2. The IC device of claim 1 , further comprising

a second active transistor of a second-type in a second-type region, having the second-type work function material; and

a second isolation transistor of the second-type in the second-type region having the first-type work function material, the second active transistor being adjacent to the second isolation transistor.

3. The IC device of claim 1 , further comprising a third active transistor adjacent to the first isolation transistor in the first-type region, the third active transistor being electrically isolated from the first active transistor by the first isolation transistor, having a higher threshold voltage than the first active transistor and the third active transistor.

4. The IC device of claim 1 , in which a gate of the first isolation transistor is biased to place the first isolation transistor in an OFF state.

5. The IC device of claim 1 , in which the first-type is an n-type and the first-type region is an n-type region and the second-type work function material is a p-type work function material, and

in which the first isolation transistor is disposed in the n-type region with the p-type work function material to provide a higher threshold voltage than the first active transistor.

6. The IC device of claim 1 , in which the first active transistor and the first isolation transistor comprise a fin field-effect transistor (FinFET) and the active portion comprises a fin of the FinFET.

7. The IC device of claim 6 , in which a first active FinFET and a first isolation FinFET comprise an active fin portion on a doped sub-fin portion, the doped sub-fin portion doped with a solid state dopant.

8. The IC device of claim 1 , in which the first active transistor and the first isolation transistor comprise a gate-all-around nanowire field-effect transistor (FET).

9. The IC device of claim 1 integrated into a mobile phone, a set top box, a music player, a video player, an entertainment unit, a navigation device, a computer, a hand-held personal communication systems (PCS) unit, a portable data unit, and/or a fixed location data unit.

10. An integrated circuit (IC) device, comprising:

a first active transistor of a first-type in a first-type region, having a first-type work function material and a channel dopant concentration in an active portion of the first active transistor, the active portion comprising a first monolithic fin and a first sub-fin, the first sub-fin integral to a substrate; and

a first means for isolating the first active transistor, the first isolating means being adjacent to the first active transistor and comprising a second monolithic fin and a second sub-fin, the second sub-fin being integral to the substrate.

11. The IC device of claim 10 , further comprising

a second active transistor of a second-type in a second-type region, having a second-type work function material; and

a second means for isolating the second active transistor, the second active transistor being adjacent to the second isolating means.

12. The IC device of claim 10 , further comprising a third active transistor adjacent to the first isolating means in the first-type region, the third active transistor being electrically isolated from the first active transistor by the first isolating means, having a higher threshold voltage than the first active transistor and the third active transistor.

13. The IC device of claim 10 , in which the first isolating means comprises a first isolation transistor of the first-type in the first-type region having a second-type work function material and the channel dopant concentration in an active portion of the first isolation transistor, and a gate of the first isolation transistor is biased to place the first isolation transistor in an OFF state.

14. The IC device of claim 10 , in which the first-type is an n-type and the first-type region is an n-type region and a second-type work function material is a p-type work function material, and

in which the first isolating means comprises a first isolation transistor disposed in the n-type region with the p-type work function material to provide a higher threshold voltage than the first active transistor.

15. The IC device of claim 14 , in which the first active transistor and the first isolation transistor comprise a fin field-effect transistor (FinFET) and the active portion comprises a fin of the FinFET.

16. The IC device of claim 15 , in which a first active FinFET and a first isolation FinFET comprise the active fin portion on the doped fin portion, the doped fin portion doped with a solid state dopant.

17. The IC device of claim 10 , in which the first isolating means comprises a first isolation transistor and in which the first active transistor and the first isolation transistor comprise a gate-all-around nanowire field-effect transistor (FET).

18. The IC device of claim 10 integrated into a mobile phone, a set top box, a music player, a video player, an entertainment unit, a navigation device, a computer, a hand-held personal communication systems (PCS) unit, a portable data unit, and/or a fixed location data unit.