| 摘要 |
Provided are a low-noise image sensor capable of improving the efficiency of charge transfer from a photodiode to a diffusion node region and effectively suppressing the generation of dark current, and a transistor for the image sensor. The image sensor includes: a photosensitive pixel having a transfer transistor formed in a structure which causes hole accumulation in a part or all regions of a gate oxide; and a sensing control part applying a negative offset potential to the gate during a part or whole of a turn-off period of the transfer transistor. When the transfer transistor is off, the image sensor may form a sufficient barrier and accumulate electrons in the photodiode, and when the transistor is on, the sensor sufficiently lowers a barrier, fully depletes the photodiode before the transfer transistor reaches a threshold voltage, and inactivates a trap in a predetermined region for a certain time, and thus the dark current can be reduced. |
