Granted Patent B2

US 7,244,989 · App. 11/144,569 · Granted Jul 17, 2007

Abstract

Claims (33)

1. A semiconductor component comprising:

a lateral insulated gate bipolar transistor (IGBT) comprising:

a semiconductor substrate having a first conductivity type;

a buried semiconductor region having a second conductivity type and located above the semiconductor substrate;

a first semiconductor region having the first conductivity type and located above the buried semiconductor region;

a second semiconductor region having the first conductivity type and located above the first semiconductor region, the second semiconductor region being separated from the buried semiconductor region by the first semiconductor region;

a third semiconductor region having the second conductivity type and located above the first semiconductor region, the third semiconductor region being separated from the buried semiconductor region by the first semiconductor region;

an emitter having the first conductivity type and disposed in the second semiconductor region; and

a collector having the first conductivity type and disposed in the third semiconductor region, the collector providing an increase in conductivity of the third semiconductor region as a result of an injection of holes into the third semiconductor region having the second conductivity type and creation of carrier overflow,

wherein the third semiconductor region and the buried semiconductor region deplete the first semiconductor region in response to a reverse bias potential applied between the collector and the emitter and the increase in conductivity in the third semiconductor region provides low ON-state voltage.

2. The semiconductor component of claim 1 wherein the first semiconductor region has a first portion between the second semiconductor region and the buried semiconductor region and a second portion between the third semiconductor region and the buried semiconductor region, and a doping concentration of the first portion is less than a doping concentration of the second portion.

3. The semiconductor component of claim 1 wherein portions of the second and third semiconductor regions form an active area for the IGBT and the buried semiconductor region is continuous under all of the active area.

4. The semiconductor component of claim 1 wherein the buried semiconductor region has a substantial portion formed under the third semiconductor region.

5. The semiconductor component of claim 1 further including a buffer region disposed in the third semiconductor region, wherein the buffer region is formed to enclose the collector region.

6. The semiconductor component of claim 1 wherein the buried semiconductor region is electrically tied to a same potential as the second semiconductor region.

7. The semiconductor component of claim 1 wherein the buried semiconductor region is electrically coupled to the emitter after a portion of the first semiconductor region located between the third semiconductor region and the buried semiconductor region is fully depleted.

8. A semiconductor component comprising an IGBT comprising:

semiconductor substrate having a surface;

a semiconductor epitaxial layer above the surface of the semiconductor substrate;

an N-type buried semiconductor region in the semiconductor;

a P-type semiconductor region in the semiconductor epitaxial layer and above the N-type buried semiconductor region;

a junction between the P-type semiconductor region and the N-type buried semiconductor region

a P-type body region in the semiconductor epitaxial layer and above the P-type semiconductor region;

an N-type drift region in the semiconductor epitaxial layer and above the P-type semiconductor region;

an oxide region above the N-type drift region

a base above at least a portion of the N-type drift, the P-type body region oxide region

a P-type emitter region disposed in the P-type body region; and

a P-type collector region disposed in the N-type drift region, the P-type collector providing an increase in conductivity of the N-type drift region as a result of an injection of holes into the N-type drift region and creation of carrier overflow,

wherein the first P-type semiconductor region is configured to be depleted in response to a reverse bias potential applied across the IGBT and the increase in conductivity in the N-type drift region provides low ON-state voltage, the N-type buried semiconductor region and the N-type drift region deplete the P-type semiconductor region in response to a reverse bias potential applied across the P-type collector region and the P-type body region, and the P-type semiconductor region has a thickness, the junction has a reverse bias breakdown depletion width in the P-type semiconductor region, and the thickness is less than the reverse bias breakdown depletion width.

9. The semiconductor component of claim 8 wherein portions of the P-type body region and the N-type drift region form an active area of the IGBTF transistor and the N-type buried semiconductor region is continuous under all of the active area of the IGBT.

10. The semiconductor component of claim 8 further including a buffer region disposed in the N-type drift region and under the P-type collector region.

11. The semiconductor component of claim 8 wherein the N-type buried semiconductor region is electrically coupled to the N-type drift region after a portion of the P-type semiconductor region located between the N-type drift region and the N-type buried semiconductor region is fully depleted.

12. The semiconductor component of claim 11 wherein after the portion of the P-type semiconductor region is fully depleted, a potential of the N-type buried semiconductor region is offset from the potential of the N-type drill region by an offset potential.

Assignments (18)