Patent ID: 9196651
Filing Date: 2015-11-24
Classification: H01L

Abstract:
1. A method, comprising: forming a p-well in a substrate of a p-typed doped semiconductor material; forming an n-well on the substrate, wherein the n-well and the substrate of the p-type doped semiconductor material are configured to form a photodiode, and the n-well has a sidewall directly contacting a sidewall of the p-well; forming source and drain regions in the substrate, including performing a first rapid thermal anneal (RTA) process to anneal the source and drain regions in the substrate, wherein the n-well includes a first portion and a second portion, the source region extends over the first portion of the n-well, and the second portion of the n-well has a top surface being coplanar with a top surface of the source region; and after forming the source and drain regions, growing a thermal oxide layer over the photodiode by performing a second RTA process, wherein a thickness of the thermal oxide layer is limited to a thickness required to enclose a damaged portion of a surface of the photodiode.