Patent ID: 8957494
Filing Date: 2015-02-17
Classification: H01L

Abstract:
1. A high voltage Schottky diode, comprising: a base comprising a P-type substrate, and two N-type buried layers located in a surface of the P-type substrate, wherein a first N-type buried layer is located below a cathode lead-out region of the Schottky diode, a second buried layer is located below a cathode region of the Schottky diode; an epitaxial layer located on the surface of the P-type substrate; two N-type well regions located in a surface of the epitaxial layer, wherein a first N-type well region is provided with the cathode lead-out region in a surface thereof, the first N-type well region is a lateral drift region of the Schottky diode, which can withstand high voltage, a second N-type well region is located on a surface of the second N-type buried layer, the second N-type well region is the cathode region of the Schottky diode; a first P-type well region located on a surface of the second N-type buried layer and surrounding the cathode region configured to protect an edge of the Schottky diode, prevent leakage, and improve withstand-voltage; a field oxide isolation region located on a surface of the lateral drift region configured to isolate an anode and a cathode of the Schottky diode; a metal layer located on a surface of the cathode region as the anode of the Schottky diode; and a metal layer located on a surface of the cathode lead-out region configured to lead out the cathode of the Schottky region.