Local lifetime control IGBT structures: turn-off performances comparison for hard- and soft-switching between 1200V trench and new planar PT-IGBTs. - Stephane Azzopardi; Atsuo Kawamura; Hideo Iwamoto; Olivier Briat; Jean-Michel Vinassa; Eric Woirgard; Christian Zardini (Microelectron. Reliab., 2001)