Patent ID: 9054243
Filing Date: 2015-06-09
Classification: H01L

Abstract:
1. A solid-state image sensor including a semiconductor substrate with a photoelectric conversion element, the sensor comprising: a first portion arranged on the semiconductor substrate and having one opening arranged on the photoelectric conversion element, the first portion including a first layer and a second layer each of which is an insulating layer, the second layer being positioned between the semiconductor substrate and the first layer, the first layer having a first opening forming a part of the one opening, and the second layer having a second opening forming a part of the one opening, the first portion including one wiring layer disposed between the first layer and the second layer; an insulator portion arranged in the one opening and having a refractive index higher than a refractive index of the first and second layers, the insulator portion including a first region and a second region, the first region being positioned in the first opening and a side face of the first region being surrounded by the first layer, and the second region being positioned in the second opening and a side face of the second region being surrounded by the second layer; a second portion having a first part arranged to cover the one opening and having a second part arranged on an upper surface of the first portion, and the first and second parts being formed from an inorganic material; and a third portion arranged directly on the second portion without being arranged inside of the one opening, and having a refractive index lower than a refractive index of the second portion, an interface between the third portion and the second part of the second portion being planar, wherein at least the second part of the second portion and at least the first region of the insulator portion are integrally formed from the same inorganic material, and the first and second openings has a tapered shape in which an area increases with distance from the semiconductor substrate, and an angle of the side face of the first region and an angle of the side face of the second region are different from each other.