Patent ID: 8039293
Filing Date: 2011-10-18
Classification: H01L

Abstract:
1. A method of manufacturing a photoelectric conversion device having a semiconductor substrate on which a pixel array region and a peripheral region are arranged, wherein a plurality of pixels are arrayed in the pixel array region, the peripheral region is arranged around the pixel array region, the peripheral region is a region where conductive lines and vias are arranged at a higher density than in the pixel array region, and each of the plurality of pixels includes a photoelectric converter, the method comprising: a first step of forming an insulating film on the semiconductor substrate; a second step of forming first holes in the insulating film; a third step of forming, in the insulating film at positions in the pixel region, second holes shallower than the first holes; a fourth step of forming electrically conductive portions by embedding an electrically conductive material in the first holes, and forming planarization assisting portions by embedding the electrically conductive material in the second holes; and a fifth step of polishing the electrically conductive portions, the insulating film, and the planarization assisting portions until the planarization assisting portions are removed, thereby planarizing upper surfaces of the electrically conductive portions and the insulating film, wherein, in the third step, the second holes are not formed in the insulating film in the peripheral region.