Patent ID: 8530299

Claim:
An electronic device including an integrated circuit comprising: a buried conductive region; a semiconductor layer overlying the buried conductive region, wherein the semiconductor layer has a primary surface and an opposing surface, and the buried conductive region lies closer to the opposing surface than to the primary surface; a first well region having an opposite conductivity type as compared to the buried conductive region and including a first doped structure and a first portion of the semiconductor layer, wherein: from a cross-sectional view, the first doped structure has a U-shape; the first portion is defined by and overlies the first doped structure; and the first portion has a lower dopant concentration as compared to the first doped structure; and the first doped structure: includes a horizontal portion that lies adjacent to the buried conductive region; and includes a vertical portion that lies adjacent to the first vertical conductive structure; and a first vertical conductive structure extending through the semiconductor layer and electrically connected to the buried conductive region and the first doped structure.