Random Doping Fluctuation Resistant FinFET
First Claim
Patent Images
1. A transistor formed on a fin comprising:
- a fin core having a first doping density; and
a channel region covering the fin core, the channel region having a second doping density that is less than the first doping density.
2 Assignments
0 Petitions
Accused Products
Abstract
An improved fin field-effect transistor (FinFET) is built on a compound fin, which has a doped core and lightly doped epitaxial channel region between that core and the gate dielectric. The improved structure reduces FinFET random doping fluctuations when doping is used to control threshold voltage. Further, the transistor design affords better source and drain conductance when compared to prior art FinFETs. Three representative embodiments of the key structure are described in detail.
-
Citations
32 Claims
-
1. A transistor formed on a fin comprising:
-
a fin core having a first doping density; and a channel region covering the fin core, the channel region having a second doping density that is less than the first doping density. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A transistor formed on a fin comprising:
-
a fin core having a first doping density; an epitaxial layer on the fin core, the epitaxial layer having a second doping density that is less than the first doping density; source and drain regions formed in the epitaxial layer, the source and drain regions being separated to define a channel region between the source and drain regions; a dielectric layer on the channel region; and a gate on the dielectric layer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A method formed on a fin comprising:
-
a) providing a fin core having a first doping density; b) forming an epitaxial layer on the fin core, the epitaxial layer having a second doping density that is less than the first doping density; c) forming an oxide on the epitaxial layer; d) forming a gate on the epitaxial layer; e) implanting source and drain extensions; f) forming sidewall spacers adjacent the gate; g) forming source and drains using implants, metal silicide formation or epitaxial enhancement or a combination of implants, metal silicide formation or epitaxial enhancement; h) depositing a first inter-layer dielectric and planarizing to expose the gate. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
Specification