Patent ID: 7560330

Claim:
A method for manufacturing a CIS (complementary metal oxide silicon image sensor), the method comprising: forming a device isolation layer on a device isolation region of a substrate of a first conductive type; forming a high-concentration first conductive type diffusion region around the device isolation layer; forming a gate electrode on an active region of the substrate with a gate insulation layer interposed therebetween; forming a low-concentration second conductive type diffusion region on a photodiode region of the active region spaced a predetermined distance apart from the device isolation layer; and forming a high-concentration second conductive type diffusion region on a transistor region of the active region, wherein the forming of the device isolation layer and the forming of the high-concentration first conductive type diffusion region comprises: implanting oxygen ions into the device isolation region; implanting high-concentration first conductive impurity ions into the device isolation region after implanting the oxygen ions; and performing an annealing process to the substrate into which the oxygen ions and the high concentration first conductive impurity ions have been implanted.