Semiconductor device and method for fabricating the same
First Claim
Patent Images
1. A method for fabricating a semiconductor device, the method comprising:
- forming a device isolation structure on a semiconductor substrate to define an active region;
selectively etching a portion of the device isolation structure to form a fin-type active region;
forming a gate structure over the fin-type active region, the gate structure including a silicon germanium layer formed over a polysilicon layer; and
performing a thermal treatment on the semiconductor substrate to drive dopants of the silicon germanium layer into the polysilicon layer such that the silicon germanium layer expands into the polysilicon layer.
1 Assignment
0 Petitions
Accused Products
Abstract
A semiconductor device comprises a fin-type active region defined by a semiconductor substrate having a device isolation structure, a recess formed over the fin-type active region, and a gate electrode including a silicon germanium (Si1-xGex) layer for fill the recess (where 0<X<1 and X is a Ge mole fraction).
13 Citations
10 Claims
-
1. A method for fabricating a semiconductor device, the method comprising:
-
forming a device isolation structure on a semiconductor substrate to define an active region; selectively etching a portion of the device isolation structure to form a fin-type active region; forming a gate structure over the fin-type active region, the gate structure including a silicon germanium layer formed over a polysilicon layer; and performing a thermal treatment on the semiconductor substrate to drive dopants of the silicon germanium layer into the polysilicon layer such that the silicon germanium layer expands into the polysilicon layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method for fabricating a semiconductor device, the method comprising:
-
forming a device isolation structure on a semiconductor substrate to define an active region; etching a portion of the device isolation structure to form a fin-type active region; and forming a gate structure over the fin-type active region, the gate structure including a polysilicon layer, a doped polysilicon layer over the polysilicon layer, and a gate conductive layer over the doped polysilicon layer, the gate conductive layer including metal, wherein the doped polysilicon layer is a silicon germanium defined as Si1-xGex, where 0<
X<
1 and X is a Ge mole fraction,wherein a lower surface of the doped polysilicon layer is provided below an upper surface of the fin-type active region. - View Dependent Claims (10)
-
Specification