Patent ID: 7338832
Filing Date: 2008-03-04
Classification: H01L

Abstract:
1. A method of fabricating a CMOS image sensor comprising: forming a device isolation pattern to define a diode region and an active region in a substrate; forming a photodiode in the diode region; serially forming a transfer gate, a reset gate and a selection gate separated from each other by a predetermined distance, wherein the transfer gate is formed on the active region adjacent to the diode region; forming a floating diffusion layer in the active region between the transfer gate and the reset gate and lightly doped diffusion layers in active regions at both sides of the selection gate; forming sidewall spacers on a sidewall of the reset gate facing the selection gate and sidewalls of the selection gate; simultaneously forming a blocking layer covering a top of the diode region and extended to the active region to cover the transfer gate and the floating diffusion layer; and implanting impurities into the active regions to form heavily doped diffusion layers that are aligned to outer surfaces of the sidewall spacers in the lightly doped diffusion layers.