Patent ID: 7057219
Filing Date: 2006-06-06
Classification: H01L

Abstract:
1. A CMOS image sensor comprising: a device isolation pattern formed in a substrate to define a diode region and an active region; a photodiode formed in the diode region; a transfer gate formed adjoining the photodiode on the active region; a reset gate and a selection gate serially formed apart from each other on the active region separated from the transfer gate by a predetermined distance; a floating diffusion layer formed of a lightly doped diffusion region in the active region between the transfer gate and the reset gate; lightly doped diffusion layers formed in the active region between the reset gate and the selection gate and in the active region adjacent to the selection gate; sidewall spacers formed on a sidewall of the reset gate facing the selection gate and on sidewalls of the selection gate; and heavily doped diffusion layers, which are aligned to the sidewall spacers, formed in the lightly doped diffusion layers; and a blocking layer formed on the diode region so as to protect the photodiode, wherein the blocking layer is extended to the active region to cover the transfer gate and the floating diffusion layer to block impurities from being implanted in the floating diffusion layer when said heavily doped diffusion layers are formed in said lightly doped diffusion layers.