Patent ID: 9595520
Date: 2017-03-14
CPC Classifications: H01L

Claim:
1. An insulated-gate bipolar translator (IGBT) with a built-in diode, comprising: a semiconductor substrate with a first conductivity type which having a first major surface and a second major surface, wherein the semiconductor substrate comprises an active region and a terminal protection area located outside the active region; an insulated gate type transistor unit formed on the active region along the first major surface, wherein a channel with the first conductivity type is formed by the insulated gate type transistor unit during a conduction thereof; and a first semiconductor layer with the first conductivity type and a second semiconductor layer with a second conductivity type, which are spaced apart from each other and formed on the active region along the second major surface of the semiconductor substrate; wherein the terminal protection area along the second major surface of the semiconductor substrate of the IGBT with the built-in diode comprises only the second semiconductor layer; wherein the first conductivity type if N-type; the second conductivity type is P-type; wherein the insulated gate transistor cell unit is an N-channel MOSFET unit; the semiconductor substrate with the first conductivity type is an N-type semiconductor substrate; the first semiconductor layer is N+-type cathode layer; the second semiconductor layer is P+-type collector layer; the first main electrode is an emitter, the second main electrode is a collector; wherein the N-channel MOSFET unit comprises: wherein the first main electrode is formed on an outside of the dielectric layer and is electrically connected to the N+ active region and the P-well; and wherein the IGBT with the built-in diode further comprises a passivation layer covering the first main electrode and the field oxide layer for protecting the chip surface from contamination by external ions.