Patent ID: 8436407
Filing Date: 2013-05-07
Classification: H01L

Abstract:
1. A photoelectric conversion device, comprising: a semiconductor substrate having a photoelectric conversion element, an adjacent element adjacent to the photoelectric conversion element, and an element isolation structure electrically isolating the photoelectric conversion element from the adjacent element; a plurality of wiring layers disposed on the semiconductor substrate apart from the semiconductor substrate, the plurality of wiring layers including a first wiring layer and a second wiring layer, the first wiring layer being arranged nearer to the semiconductor substrate than the second wiring layer; a plurality of interlayer insulation layers disposed on the semiconductor substrate, the plurality of interlayer insulation layers including a first interlayer insulation layer and a second interlayer insulation layer, the first interlayer insulation layer being arranged nearer to the semiconductor substrate than the second interlayer insulation layer, and the first wiring layer being arranged between the first interlayer insulation layer and the second interlayer insulation layer; a region arranged in the plurality of interlayer insulation layers, the region extending from the first interlayer insulation layer to the second interlayer insulation layer, and the region having a refractive index different from refractive indices of the first and second interlayer insulation layers, wherein an end of the region, which is a portion closest to the semiconductor substrate, is positioned between (i) a first plane including and being parallel to a surface of the photoelectric conversion element and (ii) a second plane including and being parallel to a lower face of the first wiring layer, wherein at least a part of the region is arranged in an area corresponding to the element isolation structure within a third plane being parallel to the first plane; and an insulation film having a refractive index between refractive indices of the semiconductor substrate and the first interlayer insulation layer, wherein the insulation film is arranged to cover the photoelectric conversion element and to extend between the element isolation structure and the region, wherein the semiconductor substrate has a floating diffusion portion and a channel portion provided between the photoelectric conversion element and the floating diffusion portion, and a gate electrode is arranged on the channel portion so as to provide a transfer MOS transistor for transferring carriers from the photoelectric conversion element to the floating diffusion portion through the channel portion, and wherein the insulation film is arranged to extend between the gate electrode and a part of the region.