Patent ID: 8698208
Filing Date: 2014-04-15
Classification: H01L

Abstract:
1. A photoelectric conversion device, comprising: a photoelectric conversion unit including a first semiconductor region configured to accumulate charges and having a first conductivity type, and a second semiconductor region arranged on the first semiconductor region and having a second conductivity type that is opposite the first conductivity type, the photoelectric conversion unit being arranged in a third semiconductor region; a floating diffusion; and a gate electrode configured to control transferring of the charges from the photoelectric conversion unit to the floating diffusion, wherein the second semiconductor region includes a first layer having impurities with a first density, and a second layer arranged on the first layer and having impurities with a second density higher than the first density, and wherein the second semiconductor region includes a first end portion at a side of the gate electrode, and a second end portion that is arranged at a position opposite the first end portion, the second end portion being arranged on the third semiconductor region.