Patent ID: 6541749
Filing Date: 2003-04-01
Classification: H01L

Abstract:
A photodetector pixel cell with the photodiode, where said photodetector pixel cell is formed in and on a substrate, said photodetector pixel cell comprising:an isolation, wherein said isolation is located on said substrate and partially inside said substrate, said isolation not only being located around the inner boundary of said photodetector pixel cell and compassing said photodetector pixel cell, but also briefly dividing said pixel cell into a diode region and a circuit region; a first well, wherein said first well is located in said substrate and is abutted the surface of said substrate, said first well being located around the inner boundary of said diode region and being contiguous to said isolation to let the edge of said isolation be enveloped by said first well, wherein the conductive type of said first well is opposite to the conductive type of said substrate; a second well, wherein said second well is located in said substrate and is abutted the surface of said substrate, said second well being located inside said circuit region, wherein the conductive type of said second well is opposite to the conductive type of said first well; a plurality of devices, wherein said devices are located in said circuit region and are located in and on said substrate; a plurality of doped regions, wherein said doped regions are located in said substrate and are abutted the surface of said substrate, said doped regions being used to form both the source and the drain of said devices, said doped regions also being located inside said diode region but being not contiguous to said first well, wherein the conductive type of any said doped regions is opposite to the conductive type of said second well; and a conductive structure, wherein the first end of said conductive structure is located inside said diode region and is connected with at least one of said doped regions, the second end of said conductive structure being inside said circuit region and is connected with said devices.