Patent ID: 8809914
Filing Date: 2014-08-19
Classification: H01L,H04N

Abstract:
1. A method for manufacturing a solid-state image sensor in which a pixel region, a peripheral circuit region arranged to surround at least part of the pixel region, and an intermediate region interposed between the pixel region and the peripheral circuit region are arranged on a semiconductor substrate, the method comprising the steps of: forming a high melting point metal compound in an active region of the peripheral circuit region and an active region of the intermediate region, but not in an active region of the pixel region; forming an etch stop film on the high melting point metal compound formed in the active region of the peripheral circuit region and the high melting point metal compound formed in the active region of the intermediate region; forming an interlayer insulating film on the etch stop film while the etch stop film covers the high melting point metal compound formed in the active region of the intermediate region; and forming a contact plug to contact the high melting point metal compound in the active region of the peripheral circuit region out of the active region of the pixel region, the active region of the peripheral circuit region, and the active region of the intermediate region, the step of forming a contact plug including the step of forming a contact hole by using the etch stop film.