Patent ID: 7247899

Claim:
An image pickup device formed on a semiconductor substrate of a first conductivity type and having a first region in which photoelectric conversion elements are arranged, and a second region in which a peripheral circuit is arranged, comprising: a first buried layer of a second conductivity type arranged on the semiconductor substrate, wherein the first buried layer extends from under the first region to under the second region; an epitaxial layer of the first conductivity type arranged on the first buried layer, extending from under the first region to under the second region and electrically isolated from the semiconductor substrate by the first buried layer; a well layer of the second conductivity type arranged within the epitaxial layer, wherein a source and drain of a MOSFET of the first conductivity type is formed in the well layer; and a second buried layer of the first conductivity type arranged at a bottom of the well layer and within the epitaxial layer, and doped with an impurity at a concentration higher than the epitaxial layer so as to electrically isolate the well layer from the first buried layer.