Patent ID: 9685523
Date: 2017-06-20
CPC Classifications: H01L

Claim:
1. A semiconductor device disposed in a semiconductor substrate wherein: the semiconductor substrate includes a first semiconductor layer of a first conductivity type disposed below a second semiconductor layer of a second conductivity type; wherein said first semiconductor layer further comprises an injection efficiency controlling buffer layer of the first conductivity type immediately below said second semiconductor layer of the second conductivity type and a drift layer of the first conductivity type below the injection efficiency controlling buffer layer wherein the injection efficiency controlling buffer layer is more heavily doped than the drift region to control an injection efficiency of said second semiconductor layer, wherein the first semiconductor layer and the second semiconductor layer constituting a PiN (P-type/intrinsic/N-type) diode; a vertical IGBT (insulate-gate bipolar transistor) is integrated with the PiN diode on the semiconductor substrate beside the PiN diode to form a reverse conducting IGBT wherein the vertical IGBT is disposed laterally side-by-side adjacent to the PiN diode on the semiconductor substrate having a metal layer covering over a top surface to function as an anode for the PiN diode and an emitter for the IGBT respectively; and a doped region of a second-conductivity disposed below the first semiconductor layer to function as a collector electrode for the IGBT integrated with and disposed side-by-side adjacent to the PiN diode.