Patent ID: 7842988
Filing Date: 2010-11-30
Classification: H01L

Abstract:
1. A photoelectric conversion device comprising: a photoelectric conversion element; a plurality of MOS transistors including a transfer MOS transistor for transferring an electric carrier from the photoelectric conversion element to a first semiconductor region and an amplifying MOS transistor for outputting a signal based on the electric carrier transferred; a wiring layer including a plurality of wirings; a plurality of interlayer insulation layers including a first interlayer insulation layer covering the photoelectric conversion element and the plurality of MOS transistors and a second interlayer insulation layer laminated on the first interlayer insulation layer; a first electroconductor; and a second electroconductor including a third electroconductor and a fourth electroconductor, wherein the first electroconductor is buried in a first hole formed in the first interlayer insulation layer for electrically connecting the first semiconductor region to a gate electrode of the amplifying MOS transistor but not through the plurality of wirings included in the wiring layer, wherein the third electroconductor is buried in a second hole formed in the first interlayer insulation layer and the fourth electroconductor is buried in a third hole formed in the second interlayer insulation layer, the third electroconductor and the fourth electroconductor being in a stacked arrangement and being electrically connected to each other for electrically connecting a second semiconductor region different from the first semiconductor region to a first wiring included in the wiring layer, and wherein the first electroconductor and the second electroconductor have a barrier metal.