Patent ID: 9673193
Date: 2017-06-06
CPC Classifications: H01L

Claim:
1. A method of manufacturing a reverse conducting insulated gate bipolar transistor, comprising the following steps: preparing an N-type substrate; growing a gate oxide layer at a front side of the N-type substrate; depositing a polysilicon gate on the gate oxide layer; forming a P well on the N-type substrate by photoetching, etching and ion-implanting processes; forming an N+ region and a front side P+ region in the P well by photoetching and ion-implanting processes; depositing a dielectric layer at the front side of the N-type substrate; depositing a protecting layer on the dielectric layer; grinding the N-type substrate by a back side grinding process; forming a back side P+ region by implanting a P-type impurity to a back side of the N-type substrate; forming a trench at the back side of the N-type substrate by photoetching and etching processes; filling the trench by depositing polysilicon at the back side of the N-type substrate, and etching the polysilicon positioned at an area outside of the trench; removing the protecting layer at the front side of the N-type substrate; selectively etching the dielectric layer to form a contact hole for shorting the N+ region and the front side P+ region, and forming a front side metal layer; depositing a passivation layer at the front side of the N-type substrate; and performing a back side metallization process at the back side of the N-type substrate, and forming a back side metal layer.