Super-junction VDMOS device with low on-resistance
View Patent ↗A super-junction VDMOS device with a low on-resistance includes: a super-junction structure disposed on a drain region; a super-junction structure having a first semiconductor pillar and a second semiconductor pillar. A HEMT structure having heterojunctions is formed between the first semiconductor pillar and the second semiconductor pillar. The HEMT structure includes a first semiconductor material pillar and a second semiconductor material pillar. Heterojunctions are formed in the super-junction structure to form the HEMT structure, inducing two-dimensional electronic gas to facilitate electrical conduction, such that the on-resistance of the VDMOS device is significantly reduced. The voltage difference between the first semiconductor pillar and the second semiconductor pillar in the super-junction structure is utilized to control a cutting-off behavior of the HEMT structure. The two-dimensional electronic gas is depleted when a high drain-source voltage difference is applied between the source region and the drain region, rendering the VDMOS device high-voltage resistant.
1. A super-junction vertical double-diffused metal oxide semiconductor field effect transistor (VDMOS) device with a low on-resistance, comprising:
a drain region, which is of a first dopant type;
a super junction structure, disposed on the drain region;
a body region, which is of a second dopant type and disposed on the super junction structure;
a source region, which is of the first dopant type; and
a gate structure;
wherein the super junction structure comprises a first semiconductor pillar, which is of the first dopant type, and a second semiconductor pillar, which is of the second dopant type,
wherein the first semiconductor pillar and the second semiconductor pillar are alternately arranged and are adjacent to each other,
wherein the second semiconductor pillar is disposed below the body region, and the first semiconductor pillar is disposed below the gate structure,
wherein a high-electron-mobility transistor (HEMT) structure having heterojunctions is disposed at an interface between the first semiconductor pillar and the second semiconductor pillar;
wherein the HEMT structure comprises a first semiconductor material pillar and a second semiconductor material pillar,
wherein the first semiconductor material pillar is disposed closer to the first semiconductor pillar, and the second semiconductor material pillar is disposed closer to the second semiconductor pillar,
wherein the HEMT structure is disposed on a surface of the drain region and is not in contact with the body region, and
wherein a first two-dimensional electronic gas (2DEG) region is formed between the second semiconductor material pillar and the second semiconductor pillar, and a second 2DEG region is formed between the first semiconductor material pillar and the second semiconductor material pillar.
2. The super-junction VDMOS device of claim 1 , wherein:
the drain region, the super junction structure, the body region, and the source region comprise SiC;
the first semiconductor material pillar comprises GaN; and
the second semiconductor material pillar comprises AlGaN.
3. The super-junction VDMOS device of claim 1 , wherein the drain region, the super junction structure, the body region and the first type semiconductor source region comprise 4H—SiC.
4. The super-junction VDMOS device of claim 1 , wherein:
the drain region, the super-junction structure, the body region, and the source region comprise Si;
the first semiconductor material pillar comprises GaAs; and
the second semiconductor material pillar comprises AlGaAs.
5. The super-junction VDMOS device of claim 1 , wherein the first dopant type is N type, and the second dopant type is P type; or the first dopant type is P type, and the second dopant type is N type.
6. The super-junction VDMOS device of claim 1 , wherein the gate structure comprises a planar gate structure or a trench gate structure.
7. The super-junction VDMOS device of claim 1 , wherein the drain region is in ohmic contact with a metal drain electrode.
8. The super-junction VDMOS device of claim 7 , wherein the body region comprises an ohmic contact layer, which is of the second dopant type.
9. The super-junction VDMOS device of claim 8 , wherein the ohmic contact layer and the source region are in ohmic contact with a metal source electrode.