Patent ID: 8637910

Claim:
An image sensor, comprising: an active region including a photoelectric conversion region and a floating diffusion region, which are separated from each other, defined by a device isolation region on a semiconductor substrate; and a transfer transistor including a first sub-gate provided on an upper surface of the semiconductor substrate and a second sub-gate extending within a recessed portion of the semiconductor substrate on the active region between the photoelectric conversion region and the floating diffusion region, wherein the photoelectric conversion region includes: a plurality of photoelectric conversion elements, which vertically overlap each other within the semiconductor substrate and are spaced apart from the recessed portion, a first photoelectric conversion element transfers charges to the floating diffusion region through a first charge flow path, and a second photoelectric conversion element transfers charges to the floating diffusion region through a second charge flow path, the first charge flow path and the second charge flow path including different channels adjacent the second sub-gate.