Patent ID: 8436423

Claim:
A back-illuminated solid-state image sensor comprising, a backside photosensitive Si epitaxial layer having a thickness and a backside surface facing incident light; and a layered sequence of refractory metal oxides or fluoride dielectrics positioned between said photosensitive Si epitaxial backside surface and said incident light, said layered sequence comprising a first dielectric layer placed in contact with said backside surface on a first face of said first dielectric layer and in contact with a second dielectric layer on a second face of said first dielectric layer; wherein said first dielectric layer has a first dielectric layer thickness, which is determined based in part on the thickness of said Si epitaxial layer, and said second dielectric layer has a thickness which is determined based in part on the thickness of said Si epitaxial layer and the first dielectric layer thickness and the index of refraction of said first dielectric layer.