Patent ID: 8878264
Filing Date: 2014-11-04
Classification: H01L

Abstract:
1. A pixel cell comprising: a photodiode (PD) region in a semiconductor for generating charge, and a storage node (SN) region in the semiconductor, selectively connected to the PD region, for holding a charge transferred from the PD region, wherein a top portion of the PD region is implanted adjacent to a side of the SN region, a bottom portion of the PD region is extended under the SN region, the bottom portion of the PD region is effective in reducing parasitic charges diffusing to the SN region, a P-well region is implanted under the SN region, and a high dose p-type isolation region is implanted in the P-well region, and is disposed under the SN region for reducing parasitic charges diffusing to the SN region, wherein the top portion of the PD region is smaller in width than the bottom portion of the PD region, and a side of the top portion of the PD region is connected to the bottom portion of the PD region by an angular section extending under the SN region.