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

Claim 20:
21. A semiconductor device, comprising:
a substrate;
a semiconductor layer formed over the substrate;
a first trench formed through the semiconductor layer and extending to the substrate;
a second trench formed through the semiconductor layer and extending to the substrate;
a first column of semiconductor material formed through the semiconductor layer between the first trench and second trench and extending to the substrate;
a second column of semiconductor material formed through the semiconductor layer between the first trench and second trench and extending to the substrate;
an oxide layer formed over a surface of the semiconductor layer and over a sidewall of the first trench; and
a nitride layer formed over the oxide layer as formed over the surface of the semiconductor layer and further formed over the oxide layer as formed over the sidewall of the first trench.