Method of forming a semiconductor device with a gate contact positioned above the active region
One illustrative method disclosed includes, among other things, forming an initial conductive source/drain structure that is conductively coupled to a source/drain region of a transistor device, performing a recess etching process on the initial conductive source/drain structure to thereby define a stepped conductive source/drain structure with a cavity defined therein, forming a non-conductive structure in the cavity, forming a layer of insulating material above the gate structure, the stepped conductive source/drain structure and the non-conductive structure, forming a gate contact opening in the layer of insulating material and forming a conductive gate contact in the gate contact opening that is conductively coupled to the gate structure.
1. A method of forming a semiconductor device comprising:
forming an active region in a semiconductor substrate;
forming an isolation region, wherein the isolation region surrounds the active region;
forming a source/drain region on the active region;
forming a gate structure on the active region;
wherein a gate length direction is defined along an axial length of said gate structure and a gate width direction is defined in a direction perpendicular to said gate length direction, and extends between said gate structure and said source/drain region;
forming an initial conductive source/drain structure that is conductively coupled to said source/drain region of said transistor device;
performing a recess etching process on said initial conductive source/drain structure to thereby define a stepped conductive source/drain structure with a cavity defined therein,
wherein said stepped conductive source/drain contact structure has a stepped configuration when viewed in cross-sectional view taken through said stepped conductive source/drain contact structure in a direction corresponding to said gate width direction;
forming a non-conductive structure in said cavity defined in said stepped conductive source/drain structure;
forming a layer of insulating material above said gate structure, said stepped conductive source/drain structure and said non-conductive structure;
forming a gate contact opening in said layer of insulating material; and
forming a conductive gate contact in said gate contact opening that is conductively coupled to said gate structure.
2. The method of claim 1 , wherein forming said gate contact opening comprises forming said gate contact opening such that the entire gate contact opening is positioned vertically above said active region.
3. The method of claim 1 , wherein forming said gate contact opening comprises forming said gate contact opening such that said gate contact opening is positioned at least partially vertically above said non-conductive structure.
4. The method of claim 1 , wherein forming said gate contact opening in said layer of insulating material comprises forming said gate contact opening so as to expose a portion of said non-conductive structure.
5. The method of claim 1 , wherein said initial conductive source/drain structure has an initial axial length in said gate width direction of said transistor device and wherein performing said recess etching process comprises performing said recess etching process such that said cavity defined in said stepped conductive source/drain structure has an axial length that is approximately 5-80% of an initial axial length of said initial conductive source/drain structure.
6. The method of claim 1 , wherein performing said recess etching process comprises performing said recess etching process such that said stepped conductive source/drain structure has a recessed portion and a non-recessed portion, wherein a thickness of said recessed portion is less than a thickness of said non-recessed portion.
7. The method of claim 6 , wherein said recessed portion has a thickness that is approximately 20-70% of said non-recessed portion.
8. The method of claim 1 , wherein said transistor device comprises a gate cap layer made of silicon dioxide and wherein forming said non-conductive structure comprises forming said non-conductive structure from a silicon nitride material.
9. The method of claim 1 , wherein said transistor device is one of a FinFET transistor device or a planar transistor device.
10. The method of claim 1 , wherein said gate structure is comprised of at least one layer of metal.
11. The method of claim 1 , wherein said gate contact is comprised of tungsten or copper.
12. The method of claim 1 , wherein said initial conductive source/drain structure comprises a metal silicide material and a conductive metal positioned above said metal silicide material.
13. The method of claim 1 , wherein said conductive metal is comprised of tungsten.
14. A method of forming a semiconductor device comprising:
forming an active region in a semiconductor substrate;
forming an isolation region, wherein the isolation region surrounds the active region;
forming a source/drain region on the active region;
forming a gate structure on the active region;
wherein a gate length direction is defined along an axil length of said gate structure and a gate width direction is defined in a direction perpendicular to said gate length direction, and extends between said gate structure and said source/drain region;
forming an initial conductive source/drain structure that is conductively coupled to said source/drain region of said transistor device;
performing a recess etching process on said initial conductive source/drain structure to thereby define a stepped conductive source/drain structure,
said stepped conductive source/drain structure having a recessed portion and a nonrecessed portion,
wherein a thickness of said recessed portion is less than a thickness of said non-recessed portion, and said stepped conductive source/drain contact structure has a stepped configuration when viewed in cross-sectional view taken through said stepped conductive source/drain contact structure in a direction corresponding to said gate width direction;
forming a non-conductive structure above said recessed portion of said stepped conductive source/drain structure;
forming a layer of insulating material above said gate structure,
said stepped conductive source/drain structure and said non-conductive structure;
forming a gate contact opening in said layer of insulating material; and
forming a conductive gate contact in said gate contact opening that is conductively coupled to said gate structure.
15. The method of claim 14 , wherein forming said gate contact opening comprises forming said gate contact opening such that the entire gate contact opening is positioned vertically above said active region.
16. The method of claim 14 , wherein forming said gate contact opening comprises forming said gate contact opening such that said gate contact opening is positioned at least partially vertically above said non-conductive structure.
17. The method of claim 14 , wherein said initial conductive source/drain structure has an initial axial length in a gate width direction of said device and wherein said recessed portion has an axial length that is approximately 5-80% of said initial axial length of said initial conductive source/drain structure.
18. The method of claim 14 , wherein said recessed portion has a thickness that is approximately 20-70% of said non-recessed portion.
19. The method of claim 14 , wherein said transistor device comprises a gate cap layer made of silicon dioxide and wherein forming said non-conductive structure comprises forming said non-conductive structure from a silicon nitride material.
20. A method of forming a semiconductor device comprising:
forming an active region in a semiconductor substrate;
forming an isolation region, wherein the isolation region surrounds the active region;
forming a source/drain region on the active region;
forming a gate structure on the active region;
wherein a gate length direction is defined along an axial length of said gate structure and a gate width direction is defined in a direction perpendicular to said gate length direction, and extends between said gate structure and said source/drain region;
forming an initial conductive source/drain structure that is conductively coupled to said source/drain region of said transistor device,
said initial conductive source/drain structure having an initial axial length in said gate width direction of said transistor device;
performing a recess etching process on said initial conductive source/drain structure to thereby define a stepped conductive source/drain structure with a cavity defined therein,
said cavity having an axial length that is approximately 5-80% of said initial axial length of said initial conductive source/drain structure,
wherein said stepped conductive source/drain contact structure has a stepped configuration when viewed in cross-sectional view taken through said stepped conductive source/drain contact structure in a direction corresponding to said gate width direction;
forming a non-conductive structure in said cavity defined in said stepped conductive source/drain structure;
forming a layer of insulating material above said gate structure,
said stepped conductive source/drain structure and said non-conductive structure;
forming a gate contact opening in said layer of insulating material so as to expose a portion of said non-conductive structure; and
forming a conductive gate contact in said gate contact opening that is conductively coupled to said gate structure.