Patent ID: 7528459
Filing Date: 2009-05-05
Classification: H01L

Abstract:
1. A punch-through diode realized as a monolithically integrated circuit based an a silicon dice or chip, comprising an n+-doped substrate covered with an n-doped epilayer; a first p-well and a second p-well implanted into the n-doped epilayer with a distance between the two wells; an n-well penetrating through the n-doped epilayer and into the n+-substrate; a first p+-doped well which connects both the first and the second p-doped wells; a polysilicon area on the n-epilayer between the first and the second p-doped wells overlapping the edges of an oxide layer; characterized in that a Schottky-metal area is deposited onto at least part of the first p-doped well's surface thus forming a metal—semiconductor—transition and that a second p+-doped well is implanted into the first p-doped well.