Patent ID: 7655545

Claim:
A method of fabricating an image sensor, the method comprising the steps of: forming an isolation pattern in a semiconductor substrate; forming first and second photodiode regions at opposite sides of the isolation pattern; implanting impurities into the first photodiode region of the semiconductor substrate at an implantation depth configured to detect light of a first wavelength, there by forming a first photodiode; implanting impurities into the first photodiode region of the substrate above the first photodiode using a first mask completely covering the second photodiode region, at an implantation depth configured to detect light of a second wavelength shorter than the first wavelength, thereby forming a second photodiode in the first photodiode region; implanting impurities into the second photodiode region using a second mask completely covering the first photodiode region and exposing the second photodiode region, thereby forming a third photodiode in the second photodiode region; forming a plug in electrical contact with the first photodiode; forming transistor structures on the semiconductor substrate such that the transistor structures are electrically connected with the first, third and second photodiodes; forming an insulating layer covering the transistor structures; and forming microlenses on the insulating layer.