Patent ID: 7410823
Filing Date: 2008-08-12
Classification: H01L

Abstract:
1. A method of manufacturing an image sensor, comprising: implanting impurities of a first conductivity type in a substrate of the first conductivity type to define a first channel region which extends to a first depth from a surface of the substrate; implanting impurities of a second conductivity type in the substrate surface to define a second channel region which is located over the first channel region and extends to a second depth from the substrate surface, wherein the first depth is greater than the second depth; forming a transfer gate electrode over the substrate surface and over the first and second channel regions; implanting impurities of the first conductivity type in the substrate to define a hole accumulated device (HAD) region which extends to a third depth from the substrate surface and which is adjacent the gate electrode; implanting impurities of the second conductivity type in the substrate to define a photodiode region which is buried in the substrate and extends to a fourth depth from substrate surface, wherein the fourth depth is greater than the third depth; implanting impurities of the second conductivity type in the substrate to define a diffusion region which electrically contacts the second channel region, wherein the HAD region is located over the photodiode region, and wherein the impurities of the HAD region are implanted prior to the impurities of the photodiode region.