Patent ID: 9378958
Filing Date: 2016-06-28
CPC Classification: H01L

Claim Text:
1. An electrostatic discharge protection structure, comprising: a semiconductor substrate, wherein a plurality of isolation structures are formed in the semiconductor substrate; a gate structure formed on the semiconductor substrate; a well region formed in the semiconductor substrate and arranged between the plurality of isolation structures, wherein the well region contains first type conducting carriers; a first conductive region and a second conductive region formed in a surface of the semiconductor substrate on respective sides of the gate structure over the well region, wherein the first conductive region and the second conductive region contain second type conducting carriers, and the first conductive region is in direct contact with one of the plurality of isolation structures; and a first doped region disposed right under the first conductive region and not under the gate structure in a cross sectional view, wherein the first doped region contains the first type conducting carriers, the first doped region is separated from the first conductive region by the well region, and a concentration of the first type conducting carriers of the first doped region is lower than the concentration of the first type conducting carriers of the well region.