Patent ID: 7514745

Claim:
A semiconductor device comprising: an insulative substrate; concave portions that extend from a main surface of the insulative substrate into the insulative substrate; stress relaxation layers in the concave portions and each having an upper surface parallel to the main surface of the insulative substrate; a device forming layer which covers the main surface of the insulative substrate and extends from an outer edge of one of the concave portions to an outer edge of an other of the concave portions; insulative stress transfer layers in contact with upper surfaces of the stress relaxation layers and side faces of the device forming layer; and a device configured using the device forming layer, wherein the insulative substrate has a thermal expansion coefficient that is larger than a thermal expansion coefficient of the stress relaxation layers and the device forming layer, and wherein the insulative substrate and the insulative stress transfer layers have rigidity higher than rigidity of the stress relaxation layers and the device forming layer.