CMOS image sensor and method for manufacturing the same

A method for manufacturing a CMOS (complementary metal oxide silicon) image sensor comprising:

• preparing a semiconductor substrate in which a device isolation region and an active region are defined;
• forming a gate pattern including a gate oxide layer and a gate electrode on the semiconductor substrate;
• forming a spacer at a sidewall of the gate pattern;
• forming a photodiode comprising a n-type region in a part of the active region and a p-type region on the n-type region;
• performing a hydrogen annealing on the p-type region of the photodiode, the semiconductor substrate, and the gate pattern;
• forming an epitaxial layer on the p-type region of the photodiode, the semiconductor substrate and the gate pattern, but not on the device isolation region and not on the spacers, by performing a selective epitaxial growth;
• and
• implanting n+ type ions in the semiconductor substrate through the epitaxial layer to form a source/drain region using a mask covering the photodiode region after forming the epitaxial layer.