Semiconductor device with field plate structures
A semiconductor device includes a source region and a drain region formed on a substrate; a gate structure formed between the source region and the drain region; a field insulating layer formed between the gate structure and the drain region; a first field plate structure formed on the field insulating layer, formed on a same plane and material as the gate structure; a source metal wiring connected to the source region, the first field plate structure, and the second field plate structure; a drain metal wiring connected to the drain region; and an interlayer insulating layer formed under the source metal wiring and the drain metal wiring; and a second field plate structure formed on the interlayer insulating layer, formed between the first field plate structure and the drain region, and formed of a material different from a material of the first field plate structure.
1 . A semiconductor device, comprising:
a source region and a drain region formed to be spaced apart from each other on a substrate;
a gate structure formed between the source region and the drain region on the substrate;
a field insulating layer formed between the gate structure and the drain region;
a first field plate structure disposed on the field insulating layer, on a same plane as the gate structure, and formed of a same material as the gate structure;
a first interlayer insulating layer formed on the first field plate structure;
a second field plate structure disposed on the first interlayer insulating layer, between the first field plate structure and the drain region, and comprising a material different from the material of the first field plate structure;
a first source metal wiring connected to the source region, the first field plate structure, and the second field plate structure; and
a drain metal wiring connected to the drain region.
2 . The semiconductor device of claim 1 , further comprising:
a source silicide formed on the source region;
a gate silicide formed on the gate structure;
a first field plate silicide formed on the first field plate structure; and
a drain silicide formed on the drain region.
3 . The semiconductor device of claim 1 , further comprising:
a source contact plug connected to the source region;
a first field plate contact plug connected to the first field plate structure;
a second field plate contact plug connected to the second field plate structure; and
a drain contact plug connected to the drain region,
wherein a vertical length of the second field plate contact plug is smaller than a vertical length of the first field plate contact plug.
4 . The semiconductor device of claim 3 ,
wherein the first source metal wiring is connected to the source contact plug, the first field plate contact plug, and the second field plate contact plug, and
wherein the drain metal wiring is connected to the drain contact plug.
5 . The semiconductor device of claim 1 , further comprising:
a second source metal wiring connected to the first source metal wiring,
wherein a longitudinal length of the second source metal wiring is longer than a longitudinal length of the first source metal wiring.
6 . The semiconductor device of claim 1 , further comprising:
a second interlayer insulating layer formed on the first interlayer insulating layer.
7 . The semiconductor device of claim 6 , further comprising:
a body region having a first conductivity type, formed on the substrate to surround the source region, and spaced apart from the field insulating layer; and
a drift region having a second conductivity type and formed to surround the drain region and the field insulating layer,
wherein the field insulating layer is disposed between the first field plate structure and the drift region,
wherein the field insulating layer and the first interlayer insulating layer are disposed between the second field plate structure and the drift region, and
wherein the field insulating layer, the first interlayer insulating layer, and the second interlayer insulating layer are disposed between the first source metal wiring and the drift region.
8 . The semiconductor device of claim 1 ,
wherein the first field plate structure and the second field plate structure are formed on different planes,
wherein the gate structure and the first field plate structure comprise poly-silicon, and
wherein the second field plate structure comprises a metal nitride film.
9 . A semiconductor device, comprising:
a first drift region of a first conductivity type disposed on a semiconductor layer and a first deep well region of a second conductivity type;
a field insulating layer disposed on the first drift region;
a body region disposed adjacent of the first drift region and spaced apart from the field insulating layer;
a source region disposed in the body region;
a drain region disposed above the first deep well region in the first drift region;
a gate structure disposed on portions of the field insulating layer, the first drift region, the body region, and the source region;
a first field plate structure disposed on the field insulating layer, on a same plane as the gate structure, and formed of a same material as a material of the gate structure;
a first interlayer insulating layer disposed on the field insulating layer, the gate structure, and the first field plate structure;
a second field plate structure disposed on the first interlayer insulating layer between the first field plate structure and the drain region, and formed of a material different from a material of the first field plate structure;
a first source metal wiring connected to the source region, the first field plate structure, and the second field plate structure; and
a drain metal wiring connected to the drain region.
10 . The semiconductor device of claim 9 , further comprising:
a pickup region disposed adjacent the source region;
a source silicide disposed on the pickup region and the source region;
a gate silicide disposed on the gate structure;
a first field plate silicide disposed on the first field plate structure; and
a drain silicide disposed on the drain region.
11 . The semiconductor device of claim 10 , further comprising:
a source contact plug connected to the source region and the first source metal wiring;
a first field plate contact plug connected to the first field plate structure and the first source metal wiring; and
a second field plate contact plug connected to the second field plate structure and the first source metal wiring,
wherein a vertical length of the second field plate contact plug is smaller than a vertical length of the first field plate contact plug.
12 . The semiconductor device of claim 9 , further comprising:
a second source metal wiring connected to the first source metal wiring,
wherein a longitudinal length of the second source metal wiring is formed longer than a longitudinal length of the first source metal wiring.
13 . The semiconductor device of claim 9 , further comprising:
a second interlayer insulating layer disposed on the first interlayer insulating layer.
14 . The semiconductor device of claim 9 ,
wherein the first field plate structure and the second field plate structure are disposed on different planes,
wherein the gate structure and the first field plate structure comprise poly-silicon, and
wherein the second field plate structure comprises a metal nitride film.