US 11,756,993 B2
IGBT light load efficiency
Madhur Bobde, Sunnyvale, CA (US); Lingpeng Guan, San Jose, CA (US); Karthik Padmanabhan, San Jose, CA (US); and Bum-Seok Suh, Seoul (KR)
Assigned to Alpha and Omega Semiconductor (Cayman) Ltd., Grand Cayman (KY)
Filed by Alpha and Omega Semiconductor (Cayman) Ltd., Grand Cayman (KY)
Filed on May 4, 2022, as Appl. No. 17/736,329.
Application 17/736,329 is a continuation of application No. 16/585,388, filed on Sep. 27, 2019, granted, now 11,342,410.
Prior Publication US 2022/0262898 A1, Aug. 18, 2022
Int. Cl. H01L 29/06 (2006.01); H01L 29/739 (2006.01); H01L 29/10 (2006.01); H01L 27/06 (2006.01)
CPC H01L 29/0634 (2013.01) [H01L 27/0664 (2013.01); H01L 29/1095 (2013.01); H01L 29/7395 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An apparatus, comprising: an insulated gate bipolar transistor (GBT) having a gate comprising a gate insulating layer formed on top of a first shield electrode extending into a drift region of a first conductivity type, the insulated gate bipolar transistor further having an implanted layer of a second conductivity type opposite the first conductivity type, a buffer layer of the first conductivity type between the drift region and the implanted region and a lightly doped layer of either the first conductivity type or the second conductivity type between the buffer region and the implanted region; and a super-junction metal-oxide semiconductor field effect transistor (SJ-MOSFET) having a drift region of the first conductivity type, a heavily doped bottom layer of a first conductivity type, wherein the drift region is of the first conductivity type, wherein the IGBT and the SJ-MOSFET are structurally coupled by a common substrate, wherein an emitter of the insulated gate bipolar transistor and a source of the super-junction metal-oxide semiconductor field effect transistor are conductively coupled by a contact metal, wherein a collector of the insulated gate bipolar transistor and a drain of the super-junction metal-oxide semiconductor field effect transistor are conductively coupled by a backside contact.