Patent ID: 7705373
Filing Date: 2010-04-27
Classification: H01L,Y02E

Abstract:
1. A MOS-type solid-state image pickup device comprising: a photoelectric conversion unit having a first semiconductor region of a first conductivity type, a second semiconductor region of a second conductivity type forming a pn-junction with the first semiconductor region, and a third semiconductor region of the first conductivity type disposed on the second semiconductor region; an amplifying MOS transistor, a gate electrode of the amplifying MOS transistor connected to a fourth semiconductor region of the second conductivity type; a transfer MOS transistor having the second semiconductor region, the fourth semiconductor region of the second conductivity type, and a gate electrode disposed on an insulating film on the first semiconductor region between the photoelectric conversion unit and the fourth semiconductor region to transfer a charge carrier from the second semiconductor region to the fourth semiconductor region, wherein the photoelectric conversion unit and the transfer MOS transistor are disposed on a substrate; a fifth semiconductor region of the second conductivity type arranged continuously to the second semiconductor region under the gate electrode; and a sixth semiconductor region of the second conductivity type having an impurity concentration lower than that of the fourth semiconductor region, and arranged at a side of the gate electrode in the fourth semiconductor region, wherein a drain of the transfer MOS transistor comprises the fourth and sixth semiconductor regions, and a bias is applied to the drain, and wherein the fifth semiconductor region is depleted during reading out the charge carrier from the second semiconductor region.