Patent ID: 8809946

Claim:
A wide trench termination structure for semiconductor device, the semiconductor device comprising a semiconductor substrate, a device region and the wide trench termination structure, the device region comprising a plurality of narrow trenches, the wide trench termination structure comprising: a wide trench defined on the semiconductor substrate and a width of the wide trench being larger than a width of the narrow trench; an oxide layer formed on inner face of the wide trench, wherein the inner face comprises an inner side face and a bottom face; at least one trench polysilicon layer formed on an outer face of the oxide layer and corresponding to the inner side face of the wide trench; a metal layer formed on the oxide layer not covered by the trench polysilicon layer and on the trench polysilicon layer, and a field oxide layer structure arranged on the semiconductor substrate and outside the wide trench structure; wherein the metal layer is in direct contact with a portion of the oxide layer formed on the bottom face of the wide trench, and wherein the trench polysilicon layer does not extend to a center portion of the bottom face of the wide trench.