Patent ID: 8399921

Claim:
A metal oxide semiconductor (MOS) structure, comprising an active region, and the active region comprising: a semiconductor substrate, comprising: a semiconductor base of a first conduction type, having a first surface and a second surface; a first epitaxial layer, formed on the first surface, and having a plurality of deep trenches formed therein; and a plurality of epitaxial pillars, formed in the deep trenches, and having a conduction type opposite to that of the first epitaxial layer; a plurality of first shallow trenches and a plurality of second shallow trenches, alternately disposed in or above the first epitaxial layer in the semiconductor substrate, the first shallow trenches being extended downward to the corresponding epitaxial pillars, and the first shallow trenches having a width greater than that of the second shallow trenches; a plurality of gate regions, disposed in the first shallow trenches respectively; a plurality of source regions, formed between the first shallow trenches and the second shallow trenches; and a source metal conducting wire, coupled to the source regions.