Patent ID: 7244632
Filing Date: 2007-07-17
Classification: H01L

Abstract:
1. A method for fabricating a complementary metal oxide semiconductor (CMOS) image sensor, comprising: preparing a first conductive type semiconductor substrate having a first region for forming a photodiode and a second region for forming transistors defined thereon; implanting impurity ions into the second region of the semiconductor substrate to form a first buried layer of a second conductive type; forming a first trench in an area of the semiconductor substrate surrounding the second region, and forming a second trench in an area of the semiconductor substrate surrounding the first region; forming a photosensitive layer over the semiconductor substrate and patterning the photosensitive layer to expose the first trench; implanting impurity ions of the second conductive type into the semiconductor substrate through the exposed first trench to form a second buried layer between the first trench and the first buried layer; removing the patterned photosensitive layer; forming an isolating barrier in the first trench and the second trench; and forming a photodiode in the first region of the semiconductor substrate, and forming a transistor in the second region of the semiconductor substrate.