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

Claim 11:
12. A method of fabricating an image sensor, the method comprising:
forming a shallow device isolation region in a substrate
etching the shallow device isolation region and the substrate below the shallow device isolation region to form a deep pixel trench;
performing a first plasma doping process to dope the substrate with ions of carbon, germanium, or both carbon and germanium, to thereby form an amorphous region in the substrate adjacent to the deep pixel trench;
performing a second plasma doping process to dope the substrate with boron ions, to thereby form an electron suppression region in the substrate adjacent to the deep pixel trench;
performing an annealing process;
forming a first fixed charge layer in the deep pixel trench to be in contact with the electron suppression region; and
forming a deep device isolation region in the deep pixel trench;
after forming the deep device isolation region, performing a grinding process to remove portions of the substrate, the amorphous region and the electron suppression region under the deep device isolation region and to expose a bottom surface of the deep device isolation region.