Patent ID: 8084803

Claim:
An apparatus comprising: a substrate; a diffusion junction region formed over the substrate; a high concentration diffusion junction region formed in a portion of the diffusion junction region; an oxide layer formed over the substrate, the oxide layer having an opening that exposes a portion of the high concentration diffusion junction region; a first polysilicon plate formed over a portion of the oxide layer and spaced from the opening; a nitride layer formed over a portion of the first polysilicon plate; a sidewall formed over a side of the first polysilicon layer, over a side of the nitride layer, and over a portion of the oxide layer between the side of the polysilicon layer and the opening; and a second polysilicon plate formed over the nitride layer, over the sidewall, and over the high concentration diffusion junction region, wherein the nitride layer is disposed over a portion of the first polysilicon plate adjacent the sidewall, and exposes a portion of the first polysilicon plate opposite the sidewall.