Patent ID: 8670056

Claim:
A solid-state imaging apparatus comprising: a plurality of pixels, each including: a photoelectric converting portion for converting incident light into signal charges, and a transferring portion for transferring the signal charges from the photoelectric converting portion, wherein the photoelectric converting portion and the transferring portion are arranged on a semiconductor substrate, the photoelectric converting portion includes a first semiconductor region of a first conductivity type for accumulating the signal charges and a second semiconductor region of a second conductivity type forming a PN junction with the first semiconductor region, a third semiconductor region of the first conductivity type is arranged between adjacent first semiconductor regions, a fourth semiconductor region of the second conductivity type and of an impurity concentration higher than that of the second semiconductor region is arranged between the first and third semiconductor regions, and a fifth semiconductor region of the second conductivity type arranged under the third semiconductor region and extending to the substrate or a neighborhood thereof, the fifth semiconductor region having an impurity concentration at any depth higher than that of the second semiconductor region at the same depth, the fifth semiconductor region having an impurity concentration profile of a first impurity concentration peak at a region closest to a top surface of the semiconductor substrate, a second impurity concentration peak at a region more distant from the top surface of the semiconductor substrate than the first impurity concentration peak, and a third impurity concentration peak between the first and second impurity concentration peaks, such that the impurity concentrations of the impurity concentration peaks decrease with decreasing distance from the top surface of the semiconductor substrate.