Patent ID: 11948965
Assignee: OMNIVISION TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A pixel cell, comprising:
a semiconductor substrate that includes a floating diffusion region, a photodiode region, and a front surface; and
a transfer gate disposed on the semiconductor substrate, coupling the photodiode region to the floating diffusion region, and including:
a first vertical gate electrode extending to a first depth along a depth direction from the front surface into the semiconductor substrate, the first depth exceeding a junction depth of the floating diffusion region; and
a second vertical gate electrode extending a second depth from the front surface along the depth direction into the semiconductor substrate, the second depth exceeding the first depth;

the first vertical gate electrode and the second vertical gate electrode being located between the floating diffusion region and the photodiode region in a first direction, the first vertical gate electrode being laterally displaced from the second vertical gate electrode in a second direction that is perpendicular to the first direction, each of the first direction and the second direction being perpendicular to the depth direction.