Patent ID: 11948956
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A method of fabricating an image sensor, the method comprising:
etching a substrate to form a plurality of deep pixel trenches that separate a plurality of pixel areas from each other;
performing a first plasma doping process to dope the substrate with ions of carbon, germanium, or both carbon and germanium, to thereby form a first amorphous region in the substrate adjacent sidewalls and bottom surfaces of the plurality of deep pixel trenches;
performing a second plasma doping process to dope the substrate with boron ions, to thereby form a first electron suppression region in the substrate adjacent the sidewalls and the bottom surfaces of the plurality of deep pixel trenches;
performing an annealing process;
forming a plurality of deep device isolation regions in the plurality of deep pixel trenches; and
after forming the plurality of deep device isolation regions, performing a grinding process to remove portions of the substrate, the first amorphous region and the first electron suppression region under the deep device isolation regions and to expose bottom surfaces of the deep device isolation regions.