Patent ID: 8148788
Filing Date: 2012-04-03
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a semiconductor layer formed on the semiconductor substrate; an electronic device formed in the semiconductor layer; and a guard ring formed in the semiconductor layer so as to surround the electronic device in plan view of the semiconductor device, wherein the guard ring comprises a plurality of grooves formed in the semiconductor layer so as to surround the electronic device in the plan view of the semiconductor device, an insulating material is deposited in each of the grooves, the depths of the grooves are different from each other, and each of the grooves penetrates through the semiconductor layer, and a first groove of the grooves is formed next to a second groove of the grooves, the electronic device is closer to the first groove than to the second groove, and the first groove is narrower than the second groove.