Patent ID: 6700144
Filing Date: 2004-03-02
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate of a first conduction type; an intrinsic semiconductor layer of the first conduction type formed on the semiconductor substrate, the intrinsic semiconductor layer having a lower impurity concentration than that of the semiconductor substrate; a first semiconductor layer of a second conduction type formed on the intrinsic semiconductor layer; a first impurity layer of the first conduction type formed in the first semiconductor layer of the second conduction type; and a bipolar transistor and a MIS transistor formed in the first semiconductor layer of the second conduction type, the laminated structure of the semiconductor substrate, the intrinsic semiconductor layer, and the first semiconductor layer providing a diode for photoelectric conversion, wherein a first insulator layer is formed in at least a portion below the bipolar transistor and a second insulator layer is formed in at least a portion below the MIS transistor, and the first insulator layer is formed at a depth deeper than that of the second insulator layer.