Semiconductor device and fabricating method thereof

1. A method of fabricating a semiconductor device, comprising:

providing an insulating layer on the semiconductor device, wherein the insulating layer covers an active region and a gate on the semiconductor device;

forming at least one connection hole in the insulating layer, wherein the at least one connection hole includes a first portion having a first width and a second portion having a second width, wherein the first portion of the connection hole is adjacent to the active region, and the first width is less than the second width; and

filling the connection hole with a metal material to form a contact to the active region, wherein forming at least one connection hole comprises:

applying a photoresist layer on the surface of the insulating layer, the photoresist layer having a window of the first width on the surface of the insulating layer, etching the insulating layer using the photoresist layer with the window to form the opening having the first width;

filling a Bottom Anti-Reflective Coating (BARC) within the opening having the first width;

widening the window of the photoresist layer to the second width, and then etching the insulating layer using the photoresist layer with the window having the second width to widen a portion of the opening; and

removing the BARC.

2. The method according to claim 1 , wherein forming at least one connection hole comprises:

etching the insulating layer to form an opening of the first width; and

etching the insulating layer at the opening to widen a portion of the opening to the second width.

3. The method according to claim 1 , wherein the height of the first portion of the connection hole is larger than the height of the gate.

4. The method according to claim 1 , wherein the metal material has at least one of a compressive stress and a tensile stress.

5. The method according to claim 1 , wherein,

the semiconductor device comprises at least a first type of transistor and a second type of transistor, wherein the metal material used for the first type of transistor is a first metal material having a first type of stress, and the metal material used for the second type of transistor is a second metal material having a second type of stress.

6. The method according to claim 5 , wherein forming the connection hole comprises:

etching the insulating layer to form the connection hole for the first type of transistor, filling the first metal material in the connection hole and performing chemical mechanical polishing (CMP); and

etching the insulating layer to form the connection hole for the second type of transistor, filling the second metal material in the connection hole and performing CMP.

7. The method according to claim 5 , wherein forming the connection hole comprises:

etching the insulating layer to form connection holes for a first type of transistors and a second type of transistors, respectively;

blocking the connection holes for the second type of transistors with a mask and filling the connection holes for the first type of transistors with the first metal material; and

blocking the connection holes for the first type of transistors with a mask and filling the connection holes for the second type of transistors with the second metal material; and

performing CMP to planarize the surface.

8. The method according to claim 5 , wherein the first type of transistor is P-MOS transistor, the first metal material is a metal material having compressive stress; and the second type of transistor is N-MOS transistor, the second metal material is a metal material having tensile stress.

9. The method according to claim 1 , wherein the first width is in a range from 20 nm to 50 nm, and the second width is in a range from 30 nm to 100 nm.

10. The method according to claim 1 , wherein a depth of the connection hole is in a range of 500 Å to 2000 Å.