Patent ID: 7897425
Filing Date: 2011-03-01
Classification: H01L

Abstract:
1. A method for fabricating an image sensor comprising: forming a gate on a pixel region of a semiconductor substrate; forming a photo diode on the pixel region at a first side of the gate, and forming a floating diffusion region on the pixel region at a second side of the gate; forming an oxide film on the pixel region on which the gate, the photo diode, and the floating diffusion region are formed, and on an edge region of the semiconductor substrate; forming a first photoresist pattern having openings corresponding to the gate and the floating diffusion region on the oxide film, and forming a sacrificial oxide layer by etching the oxide film using the first photoresist pattern as a mask; forming a metal layer on the first photoresist pattern, the gate, and the floating diffusion region; forming a salicide layer on the gate and the floating diffusion region by performing rapid thermal processing; etching a remaining non-salicided portion of the metal layer, the first photoresist pattern, and at least a portion of the sacrificial oxide layer; forming an interlayer insulating film on the semiconductor substrate and planarizing the interlayer insulating film; forming a second photoresist pattern having first, second, and third openings on the interlayer insulating film; and forming contact holes respectively corresponding to the gate and the floating diffusion region and forming an edge open part exposing a portion of the semiconductor substrate in the edge region by etching the interlayer insulating film on the edge region using the second photoresist pattern as an etching mask.