Patent ID: 7935557
Filing Date: 2011-05-03
Classification: H01L

Abstract:
1. A manufacturing method for manufacturing a photoelectric conversion device that has a pixel array region in which a plurality of pixels are to be arrayed, each of the plurality of pixels including a photoelectric conversion unit that has a charge accumulation region and protection region arranged on the charge accumulation region, a charge-voltage converter, a transfer transistor that transfers charges in the charge accumulation region to the charge-voltage converter, and an output unit that outputs a signal in accordance with a voltage of the charge-voltage converter, the method comprising: a first step of forming a gate electrode of the transfer transistor in the pixel array region on a semiconductor substrate; a second step of forming a semiconductor region of a first conductivity type in the pixel array region of the semiconductor substrate; a third step of forming an insulation film so as to cover the semiconductor substrate and the gate electrode of the transfer transistor; and a fourth step of forming the protection region of a second conductivity type, which is the opposite conductivity type to the first conductivity type, by implanting ions in the semiconductor region of the semiconductor substrate using the gate electrode of the transfer transistor and a portion of the insulation film which covers a side face of the gate electrode of the transfer transistor as a mask in a state in which the semiconductor substrate and the gate electrode of the transfer transistor are covered by the insulation film, and causing a portion of the semiconductor region of the first conductivity type other than the protective region to be the charge accumulation region.