Patent ID: 7008815
Filing Date: 2006-03-07
Classification: H01L,Y02E

Abstract:
1. A method of manufacturing a self-aligned guard ring of a photo diode comprising: providing a semiconductor substrate with a photo diode region defined on the semiconductor substrate, and an isolation matter surrounding the photo diode region; forming a photo sensor mask on the semiconductor substrate; utilizing the photo sensor mask as a block for performing a first ion implantation process to create a photo sensor inside the photo diode region in the semiconductor substrate; forming a first mask on the photo sensor; removing the photo sensor mask; forming a spacer around the first mask; forming a second mask on the isolation matter outside edge and the second mask exposing the photo diode region; utilizing the first mask, the spacer, and the second mask as a block for performing a second ion implantation process to create a self-aligned guard ring surrounding the photo sensor; and removing the first mask, the spacer, and the second mask.