Patent ID: 8729645

Claim:
A structure comprising: a substrate having a first side and a second side, the second side being opposite the first side, a device being on the first side; a first dielectric layer on the second side of the substrate, the first dielectric layer extending in a direction from an edge of the substrate towards a center of the substrate parallel to the second side, the first dielectric layer having a first innermost sidewall relative to the center of the substrate; a high-k layer on the first dielectric layer, the high-k layer having a second innermost sidewall relative to the center of the substrate, the second innermost sidewall being within 2 millimeters of the first innermost sidewall in a direction parallel to the second side; and a polysilicon layer on the high-k layer, the polysilicon layer extending towards the center of the substrate further than the first innermost sidewall.