Patent ID: 8350305

Claim:
A pixel device comprising: a floating diffusion portion formed between a first shallow trench isolation region and a second shallow trench isolation region, the first and second shallow trench isolation regions being in bordering contact with the floating diffusion portion; a transfer transistor configured to transfer electric charges photoelectrically-converted in a photoelectric conversion element to the floating diffusion portion; and a first impurity diffusion isolation region formed on a side of the first shallow trench isolation region opposite from the floating diffusion portion, the first impurity diffusion isolation region being in bordering contact with the first shallow trench isolation region and having a conductivity type opposite to a conductivity type of the floating diffusion portion, wherein the first and second shallow trench isolation regions extend under a gate electrode of the transfer transistor, a portion of the first impurity diffusion isolation region is interposed between a distal end portion of the first shallow trench isolation region and the photoelectric conversion element, the portion of the first impurity diffusion isolation region interposed between the distal end portion of the first shallow trench isolation region and the photoelectric conversion element is in bordering contact with a surface of the distal end portion of the first shallow trench isolation region at an interface, the interface abuts a channel region between the photoelectric conversion element and the floating diffusion portion at a position under the gate electrode of the transfer transistor and the portion of the first impurity diffusion region interposed between the distal end portion of the first shallow trench isolation region and the photoelectric conversion element comes in bordering contact with the channel region.