Patent ID: 8125008

Claim:
A Schottky device with a breakdown voltage, comprising: a substrate being doped with a first type of ions; a deep well being doped with a second type of ions, and formed in the substrate; a Schottky contact, at a top surface of the deep well, contacting a first electrode with the deep well; two heavily doped regions being doped with the second type of ions in the deep well; two Ohmic contacts contacting two second electrodes with the two heavily doped regions, respectively; two first doped regions being doped with the first type of ions in the substrate, wherein each of the two first doped regions is separated from the deep well by a distance which is larger than 0 μm and equal to or smaller than 20 μm, and the distance between the deep well and each of the first doped regions adjusts the breakdown voltage; and two second doped regions being doped with the first type of ions, and being only formed in the deep well and around the Schottky contact, wherein an ion concentration and a depth of the two second doped regions respectively adjust the breakdown voltage; wherein the deep well has a geometry gap with a width, the geometry gap is formed at a bottom surface of the deep well and opposite the Schottky contact, and has a tapered shape having two side surfaces of a triangle in a cross-sectional view, the first type of ions and the second type of ions are complementary, and the width of the gap is configured to adjust the breakdown voltage.