Patent ID: 9627426
Date: 2017-04-18
CPC Classifications: H01L

Claim:
1. An image sensor device, comprising: a semiconductor substrate comprising a front surface, a back surface opposite to the front surface, a first light-sensing region close to the front surface, a second light-sensing region close to the front surface, and a first trench between the first light-sensing region and the second light-sensing region; a reflective layer positioned on a first inner wall and a second inner wall of the first trench and on a bottom surface of the first trench that is between the first inner wall and the second inner wall, wherein the reflective layer has a light reflectivity ranging from about 70% to about 100%, the first inner wall is opposite to the second inner wall, the second inner wall is between the first inner wall and the first light-sensing region, the reflective layer has a first portion covering the first inner wall and a second portion covering the second inner wall, the first portion and the second portion extend to a first portion and a second portion of an opening edge of the first trench respectively, the first portion and the second portion of the opening edge of the first trench are adjacent to the first inner wall and the second inner wall respectively, the reflective layer has a bottom portion on the bottom surface of the first trench, and the reflective layer is electrically isolated from the first light-sensing region of the semiconductor substrate; an insulating layer positioned between the reflective layer and the semiconductor substrate; and an isolation structure in the semiconductor substrate and adjacent to the front surface, wherein the reflective layer and the entirety of the isolation structure are between the first light-sensing region and the second light-sensing region, the reflective layer is over the isolation structure, and the isolation structure and the insulating layer are separated from each other by the semiconductor substrate.