Patent ID: 7479675
Filing Date: 2009-01-20
Classification: H01L,H04N

Abstract:
1. A solid-state image pickup device comprising: a plurality of pixels integrated in an array configuration on a semiconductor substrate; each pixel having the following parts: a photodiode that receives light and generates and accumulates photoelectric charge, a transfer transistor that transfers said photoelectric charge from said photodiode, a floating diffusion to which said photoelectric charge is transferred via said transfer transistor; an accumulating capacitive element that is connected to said photodiode via said transfer transistor, and that accumulates the photoelectric charge overflowing from said photodiode via said transfer transistor in the accumulating operation; and an accumulating transistor that connects or divides the potentials of said floating diffusion and said accumulating capacitive element, with one source/drain region becoming said floating diffusion and with another source/drain region being connected to said accumulating capacitive element; in at least one of said source/drain regions that form said accumulating transistor, there are the following layers: a first semiconductor layer of the first electroconductive type that is formed in an active region of said semiconductor substrate and is divided by the element separating insulating film; a second semiconductor layer of the first electroconductive type formed in said first semiconductor layer such that at least a side surface of said element separating insulating film is covered; and a third semiconductor layer of the second electroconductive type formed on an outer layer portion of said first semiconductor layer so that a joint plane is formed with said second semiconductor layer whereby when said solid-state image pickup device is turned ON, the depletion layer extending from said joint plane does not reach the side surface of said element separating insulating film.