Patent ID: 11901381
Assignee: STMICROELECTRONICS (CROLLES 2) SAS
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An image sensor comprising a plurality of pixels, each including:
a doped photosensitive region of a first conductivity type extending vertically in a semiconductor substrate;
a first charge collection region more heavily doped with the first conductivity type than the doped photosensitive region, the first charge collection region extending vertically in the substrate from an upper surface of the substrate and being arranged above the doped photosensitive region;
a vertical stack that includes a vertical transfer gate and a vertical electric insulation wall, the stack crossing the substrate and being in contact with the first charge collection region, the vertical transfer gate being arranged at the upper surface of the substrate and penetrating into the substrate deeper than the first charge collection region, wherein the vertical transfer gate includes a gate electrode and a gate dielectric that are arranged on the vertical electric insulation wall; and
a vertical electric insulation structure crossing the substrate and laterally delimiting the doped photosensitive region and the pixel, wherein the vertical electric insulation wall is a portion of the vertical electric insulation structure.