Patent ID: 6838707

Claim:
An electrostatic discharge protection device, comprising: a semiconductor substrate; an isolation region formed inside the semiconductor substrate; a dielectric layer disposed over the semiconductor substrate and being in contact with the isolation structure; and a layer of silicon, formed over the dielectric layer, including a first p-type portion, a first n-type portion contiguous with the first p-type portion, a second p-type portion contiguous with the first p-type portion and the first n-type portion, a second n-type portion, a third p-type portion, a third n-type portion contiguous with the third p-type portion, and a fourth p-type portion contiguous with the third p-type portion and the third n-type portion, wherein at least one of the first p-type portion, second p-type portion, third p-type portion, fourth p-type portion, first n-type portion, second n-type portion, and third n-type portion overlaps the isolation region to provide electrostatic discharge protection.