Patent ID: 7005689

Claim:
An image sensor comprising: a device isolation layer formed in a first conduction type semiconductor substrate and defining a diode region and an active region; a second conduction type photodiode formed in the diode region, wherein the second conduction type photodiode is a predetermined depth from a top surface of the semiconductor substrate; a first conduction type photodiode interposed between the second conduction type photodiode and the surface of the semiconductor substrate; a first gate disposed on the active region adjacent to the second conduction type photodiode; at least one sidewall spacer disposed on one sidewall of the first gate, wherein the at least one sidewall spacer includes a first spacer and a second spacer which is disposed on the first spacer; a blocking pattern and an insulation pattern that are stacked on the diode region, wherein the blocking pattern is formed of insulation material having a metal diffusion coefficient which is lower than a silicon oxide diffusion coefficient; and a silicide preventing pattern covering the blocking pattern and the first gate.