Patent ID: 7732245
Filing Date: 2010-06-08
Classification: H01L

Abstract:
1. A method for manufacturing a photodiode of a CMOS image sensor comprising: forming a lightly doped epitaxial layer on a semiconductor substrate; forming a device isolation film on the semiconductor substrate; forming a photodiode region on the semiconductor substrate; forming a first insulating film on the lightly doped epitaxial layer including the photodiode region; patterning the first insulating film to open a portion of the lightly doped epitaxial layer between the device isolation film and the photodiode region, and to open another portion of the lightly doped epitaxial layer for a gate formation region; forming a photoresist film on the first insulating film to cover the gate formation region on the lightly doped epitaxial layer; forming a diffusion region only in the opened portion of the lightly doped epitaxial layer between a sidewall of the device isolation film and a sidewall of the photodiode region using the photoresist film pattern and patterned first insulating film as a mask; and forming a gate electrode on the lightly doped epitaxial layer and inside the gate formation region.