Patent ID: 8309996

Claim:
A complementary metal-oxide semiconductor (CMOS) image sensor (CIS), comprising: an epitaxial layer on a substrate in which a first, second, third and fourth region are defined; a photodiode in an upper portion of the epitaxial layer in the first region; a plurality of gate structures on the epitaxial layer in the second, third and fourth regions; a first blocking layer on the plurality of gate structures and the epitaxial layer in the first and second regions; a first lightly-doped impurity layer in the upper portion of the epitaxial layer adjacent to the plurality of gate structures in the second region; a first highly-doped impurity layer in the upper portion of the epitaxial layer adjacent to the plurality of gate structures in the second region; a second highly-doped impurity layer in the upper portion of the epitaxial layer adjacent to the plurality of gate structures in the third and fourth regions; a color filter layer over the photodiode; and a microlens on the color filter layer, wherein the first lightly-doped impurity layer and the first and second highly-doped impurity layers include a plurality of second conductive type impurities.