US 2006/0221667 A1 · Solid state image pickup device and camera

Abstract

An object of the present invention is to simultaneously realize the enlargement of a dynamic range and the downsizing of a pixel. An additional capacitor CS is composed by using: a first capacitor formed of a first diffusion layer, a second diffusion layer and a P well by layering the P well, the first diffusion layer, a first dielectric film, a first polysilicon layer, a second dielectric film and a second polysilicon layer; a second capacitor formed of the second diffusion layer, the first polysilicon layer and the first dielectric film; and a third capacitor formed of the first polysilicon layers, a second polysilicon layer, and a second dielectric film. Thereby, the additional capacitor CS for accumulating carriers overflown from a photodiode PD can secure a required capacitance value while making its size as small as possible.

Claims14

Dependent claims

A solid state image pickup device including a plurality of pixels having:

a photoelectric conversion region for accumulating carriers generated by incident light;
a first transfer switch for transferring the carriers accumulated in the photoelectric conversion region;
a floating diffusion region for making the carriers accumulated in the photoelectric conversion region flow therein through the first transfer switch;
a carrier accumulating region for accumulating at least a part of carriers overflown from the photoelectric conversion region;
and
a second transfer switch for transferring the carriers accumulated in the carrier accumulating region to the floating diffusion region;
wherein
the carrier accumulating region has a plurality of parts each of which forms a capacitor for accumulating the carriers overflown from the photoelectric conversion region therein, and the plurality of the parts are stacked.

5 more elements

A solid state image pickup device including a plurality of pixels having:

a photoelectric conversion region for accumulating carriers generated by incident light;
a first transfer switch for transferring the carriers accumulated in the photoelectric conversion region;
a floating diffusion region for making the carriers accumulated in the photoelectric conversion region flow therein through the first transfer switch;
a carrier accumulating region for accumulating at least a part of carriers overflown from the photoelectric conversion region;
and
a second transfer switch for transferring the carriers accumulated in the carrier accumulating region to the floating diffusion region;
wherein
the carrier accumulating region has one part of a semiconductor region of a first conductivity type,
a first dielectric film formed on one part of the semiconductor region,
a first electrode layer formed on the first dielectric film,
a second dielectric film formed on the first semiconductor film, and
a second electrode layer formed on the second dielectric film.

9 more elements

Dependencies are inferred from the claim text.

Solid state image pickup device and camera

Life of this patent

Solid state image pickup device and camera

Life of this patent

Abstract

Claims14