Patent ID: 7682863

Claim:
A method comprising: forming a red photodiode in first epitaxial layer; forming an isolation layer in said red photodiode by ion implantation, an upper corner portion of said red photodiode being excluded from the ion implantation and becoming a contact region; forming a green photodiode in a surface of said isolation layer; forming at least one contact in said contact region a predetermined spatial distance from said green photodiode; forming a second epitaxial layer over said first epitaxial layer; forming a plurality of plugs in said second epitaxial layer for electrically connecting to said green photodiode and said contact; forming a device isolation film in a surface of said second epitaxial layer; forming a well region in said second epitaxial layer inside said plurality of plugs; and forming a blue photodiode in a surface of said second epitaxial layer above said green photodiode.