High voltage insulated gate bipolar transistors with minority carrier diverter
First Claim
Patent Images
1. A high power insulated gate bipolar junction transistor (“
- IGBT”
), comprising;
a wide band gap semiconductor bipolar junction transistor (“
BJT”
) having a collector, an emitter and a base;
a MOSFET having a gate, a source region, a drain region and a channel region extending between the source region and the drain region, wherein the source region, the drain region and the channel region comprise a first wide band gap semiconductor material, and wherein the MOSFET is configured to provide a current to the base of the BJT; and
a minority carrier diversion semiconductor layer between the base of the BJT and the gate of the MOSFET configured to divert a portion of the minority carrier current flow through the IGBT, the minority carrier diversion semiconductor layer having a conductivity type opposite the conductivity type of the base of the BJT and forming a heterojunction with the base of the BJT.
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Abstract
High power insulated gate bipolar junction transistors are provided that include a wide band gap semiconductor bipolar junction transistor (“BJT”) and a wide band gap semiconductor MOSFET that is configured to provide a current to the base of the BJT. These devices further include a minority carrier diversion semiconductor layer on the base of the BJT and coupled to the emitter of the BJT, the minority carrier diversion semiconductor layer having a conductivity type opposite the conductivity type of the base of the BJT and forming a heterojunction with the base of the BJT.
231 Citations
25 Claims
-
1. A high power insulated gate bipolar junction transistor (“
- IGBT”
), comprising;a wide band gap semiconductor bipolar junction transistor (“
BJT”
) having a collector, an emitter and a base;a MOSFET having a gate, a source region, a drain region and a channel region extending between the source region and the drain region, wherein the source region, the drain region and the channel region comprise a first wide band gap semiconductor material, and wherein the MOSFET is configured to provide a current to the base of the BJT; and a minority carrier diversion semiconductor layer between the base of the BJT and the gate of the MOSFET configured to divert a portion of the minority carrier current flow through the IGBT, the minority carrier diversion semiconductor layer having a conductivity type opposite the conductivity type of the base of the BJT and forming a heterojunction with the base of the BJT. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- IGBT”
-
14. A high power insulated gate bipolar junction transistor (“
- IGBT”
), comprising;a wide band gap semiconductor bipolar junction transistor (“
BJT”
) having a collector, an emitter and a base;a MOSFET that is configured to provide a current to the base of the BJT; and a minority carrier diversion semiconductor layer between the base of the BJT and a gate of the MOSFET that is configured to divert a portion of the minority carrier current flow through the IGBT, the minority carrier diversion semiconductor layer having a conductivity type opposite the conductivity type of the base of the BJT and forming a heterojunction with the base of the BJT, wherein the wide band gap semiconductor BJT comprises a silicon carbide BJT, wherein the MOSFET comprises a silicon carbide MOSFET, wherein the minority carrier diversion semiconductor layer comprises a doped polysilicon layer, wherein the IGBT includes an n-type injection layer, a p-type layer on the n-type injection layer, an n-well in an upper portion of the p-type layer, a heavily-doped p-type layer in an upper region of the n-well, a gate dielectric layer on the n-well and the heavily-doped p-type layer, and a gate electrode on the gate dielectric layer, wherein the p-type layer on the n-type injection layer comprises a p-type base layer that has a doping concentration that is less than a doping concentration of the heavily-doped p-type layer, and a p-type drift layer on the p-type base layer having a doping concentration that is less than the doping concentration of the p-type base layer, wherein the doped polysilicon layer is between the gate dielectric layer and the p-type drift layer, and wherein a top surface of the doped polysilicon layer is farther above the n-type injection layer than is a top surface of the n-well.
- IGBT”
-
15. A high power p-channel silicon carbide insulated gate bipolar junction transistor (“
- IGBT”
), comprising;an n-type silicon carbide injection layer; a p-type silicon carbide base layer on the n-type silicon carbide injection layer; a p-type silicon carbide drift layer on the p-type silicon carbide base layer opposite the n-type silicon carbide injection layer; a silicon carbide n-well in an upper portion of the p-type silicon carbide drift layer; a p-type silicon carbide emitter region in the silicon carbide n-well and directly contacting the silicon carbide n-well; an n-type silicon layer on the p-type silicon carbide drift layer opposite the p-type silicon carbide base layer; a gate insulation layer on the silicon carbide n-well and the n-type silicon layer; and a gate electrode on the gate insulation layer opposite the silicon carbide n-well and the n-type silicon layer.
- IGBT”
-
16. A high power p-channel silicon carbide insulated gate bipolar junction transistor (“
- IGBT”
), comprising;an n-type silicon carbide injection layer; a p-type silicon carbide base layer on the n-type silicon carbide injection layer; a p-type silicon carbide drift layer on the p-type silicon carbide base layer opposite the n-type silicon carbide injection layer; a silicon carbide n-well in an upper portion of the p-type silicon carbide drift layer; an n-type silicon layer on the p-type silicon carbide drift layer opposite the p-type silicon carbide base layer; a gate insulation layer on the silicon carbide n-well and the n-type silicon layer; a gate electrode on the gate insulation layer opposite the silicon carbide n-well and the n-type silicon layer; and a p-type silicon carbide emitter layer in an upper surface of the silicon carbide n-well, wherein the n-type silicon layer is electrically connected to the p-type silicon carbide emitter layer. - View Dependent Claims (17, 18, 19)
- IGBT”
-
20. A high power insulated gate bipolar junction transistor (“
- IGBT”
) that includes a silicon carbide bipolar junction transistor (“
BJT”
) and a MOSFET, the IGBT comprising;a plurality of silicon carbide layers that include first and second silicon carbide well regions; and a doped semiconductor layer that forms a p-n heterojunction with a first of the plurality of silicon carbide layers, the doped semiconductor layer disposed between the first and second silicon carbide well regions; wherein the silicon carbide BJT is located within the plurality of silicon carbide layers; wherein a source region and a drain region of the MOSFET are located within the plurality of silicon carbide layers, and a gate electrode of the MOSFET is on the doped semiconductor layer; and wherein the doped semiconductor layer is configured to provide a minority carrier current path between the first and second well regions. - View Dependent Claims (21, 22, 23, 24, 25)
- IGBT”
Specification