Patent ID: 9576993
Date: 2017-02-21
CPC Classifications: H01L,H04N

Claim:
1. A method for manufacturing an image capturing device having a photoelectric conversion unit, a transfer transistor, and a first peripheral transistor, said transfer transistor transferring a charge generated in said photoelectric conversion unit, said first peripheral transistor processing said charge as a signal, the method comprising the steps of: defining an element formation region by forming an element isolation insulating film in a semiconductor substrate, said element formation region including a pixel region and a first peripheral region, said photoelectric conversion unit and said transfer transistor being formed in said pixel region, said first peripheral transistor being formed in said first peripheral region; forming gate electrodes, the step of forming said gate electrodes including the step of forming a transfer gate electrode of said transfer transistor in said pixel region and forming a first peripheral gate electrode of said first peripheral transistor in said first peripheral region; forming the photoelectric conversion unit at a portion of said pixel region on one side relative to said transfer gate electrode; forming a first insulating film to serve as an offset spacer film so as to cover said element formation region and said gate electrodes; forming said offset spacer film on each of side wall surfaces of said gate electrodes by providing anisotropic etching process to said first insulating film while a portion of said first insulating film covering said photoelectric conversion unit remains; removing the portion of said first insulating film covering said photoelectric conversion unit by providing wet etching process; and forming a sidewall insulating film on each of the side wall surfaces of said gate electrodes after the portion of said first insulating film is removed.