Patent ID: 7112466
Filing Date: 2006-09-26
Classification: H01L

Abstract:
1. A method for forming a semiconductor device, comprising: providing a substrate; forming a photodiode in the substrate, the photodiode receiving photoelectrons in response to photons received by the semiconductor device, forming a trench isolation region in the substrate; forming a junction isolation region in the substrate, the junction isolation region having an exterior surface that is between an exterior surface of the photodiode and the trench isolation region, wherein a doping level of the junction isolation region is higher than a doping level of the photodiode such that a depletion region of the photodiode is prevented from contacting a surface of the trench isolation region, thus lowering a junction leakage; and forming an isolation surface implant, the isolation surface implant being situated within the photodiode and only in a portion of the photodiode, such that the isolation surface implant is in contact with a top surface of the substrate to provide electrical isolation between the photodiode and the top surface of the substrate, wherein the isolation surface implant is not covered by an insulating film.