Semiconductor device

摘要

A semiconductor device in which a photoreceptor element and a semiconductor element are formed on a common semiconductor substrate, includes: a substrate of a first conductive type; and a semiconductor layer of a second conductive type formed on the substrate; wherein the photoreceptor element is composed of the substrate and the semiconductor layer; and an impurity concentration region of the first conductive type having an impurity concentration higher than that of the substrate is provided at a position under the semiconductor layer in a region where the semiconductor element is to be formed.