/Light Shield For Pixel Of Image Sensor
Abstract

A pixel of an image sensor includes: a semiconductor material substrate; a photosensitive region formed in the substrate, the photosensitive region generating photo-induced electrical charge in response to illumination with light; a storage node formed in the substrate proximate to the photosensitive region, the storage node selectively receiving and storing photo-induced electrical charge generated by the photosensitive region; a transfer gate structure formed between the photosensitive region and the storage node to regulate a transfer of the photo-induced electrical charge therebetween; an inter-layer dielectric (ILD) formed over the transfer gate structure; and a light-shielding structure contained within the ILD and covering the transfer gate structure so as to inhibit light from reaching the transfer gate structure, the light-shielding structure including an indentation on a first end surface of the light-shielding structure, which first end surface is proximate to the transfer gate structure, wherein an end of the transfer gate structure at least partially extends into the indentation such that the end of the transfer gate structure extending into the indentation is at least partially surrounded by the light-shield structure.

Full Text

What is claimed is:

A pixel of an image sensor includes: a semiconductor material substrate; a photosensitive region formed in the substrate, the photosensitive region generating photo-induced electrical charge in response to illumination with light; a storage node formed in the substrate proximate to the photosensitive region, the storage node selectively receiving and storing photo-induced electrical charge generated by the photosensitive region; a transfer gate structure formed between the photosensitive region and the storage node to regulate a transfer of the photo-induced electrical charge therebetween; an inter-layer dielectric (ILD) formed over the transfer gate structure; and a light-shielding structure contained within the ILD and covering the transfer gate structure so as to inhibit light from reaching the transfer gate structure, the light-shielding structure including an indentation on a first end surface of the light-shielding structure, which first end surface is proximate to the transfer gate structure, wherein an end of the transfer gate structure at least partially extends into the indentation such that the end of the transfer gate structure extending into the indentation is at least partially surrounded by the light-shield structure.
Timeline
Filed
06/16/2026
Published
10/01/2026
Granted
Not Available
IPC Codes(1)
H10F 39/00:Integrated devices, or assemblies of multiple devices, comprising at least one element covered by group e.g. radiation detectors comprising photodiode arrays