Patent ID: 8981510
Filing Date: 2015-03-17
Classification: H01L

Abstract:
1. An apparatus comprising an image sensor device that comprises: a substrate having a front side and a back side; an interconnect structure disposed over the front side of the substrate; a first radiation-detection device and a second radiation-detection device disposed in the substrate, the first and second radiation-detection devices being operable to detect radiation waves that enter the substrate through the back side; an isolation structure disposed between the first and second radiation-detection devices; an anti-reflective coating (ARC) layer having a first refractive index value disposed over the back side of the substrate, the ARC layer having a first ridge and a second ridge that are disposed over the first and second radiation-detection devices, respectively; a first lens disposed directly over the first ridge and having opposing ends extending beyond opposing sidewalls of the first ridge; and a second lens disposed directly over the second ridge and having opposing ends extending beyond opposing sidewalls of the second ridge, wherein the first and second ridges are separated by a substance having a second refractive index value that is less than the first refractive index value, wherein the substance is air, wherein the air extends uninterrupted from the first ridge to the second ridge, wherein the substance and the isolation structure are vertically aligned along a plane extending substantially perpendicular to the back side of the substrate, and wherein the first and second ridges extend through the substance from a first surface at an interface of the substance, the first surface disposed towards the substrate, to a second surface at an interface of the substance, the second surface opposite the first surface.