Patent ID: 11935839
Assignee: ICEMOS TECHNOLOGY LIMITED
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of making a semiconductor device, comprising:
providing a semiconductor layer including a first conductivity type;
forming a first trench at least partially through the semiconductor layer;
forming a second trench at least partially through the semiconductor layer;
forming a first column of semiconductor material including a second conductivity type opposite the first conductivity type in the semiconductor layer between the first trench and second trench and adjacent to the first trench;
forming a second column of semiconductor material including a second conductivity type opposite the first conductivity type in the semiconductor layer between the first trench and second trench and adjacent to the second trench with a portion of the semiconductor layer including the first conductivity type remaining between the first column of semiconductor material and the second column of semiconductor material;
forming a first oxide layer over a surface of the semiconductor layer and over a sidewall of the first trench; and
forming a first nitride layer over the first oxide layer as formed over the surface of the semiconductor layer and further formed over the first oxide layer as formed over the sidewall of the first trench.