Patent ID: 6661045
Filing Date: 2003-12-09
Classification: H01L

Abstract:
A MOS type solid-state imager comprising:a photoelectric conversion element formed in a semiconductor substrate of a first conductive type; a first MOS transistor of a second conductive type formed in a first element region of the semiconductor substrate for reading out a charge generated by the photoelectric conversion element; a second MOS transistor of the second conductive type formed in a second element region of the semiconductor substrate; an insulative isolation layer surrounding the first and second element regions; and a punch-through preventing region of the first conductive type for preventing punch-through, said punch-through preventing region being formed in a surface area of the second element region as well as being formed immediately under the insulative isolation layer, wherein a bottom surface of the punch-through preventing region of the second element region is deeper than a bottom surface of the punch-through preventing region formed immediately under the insulative isolation layer.