Patent ID: 7608192
Filing Date: 2009-10-27
Classification: H01L

Abstract:
1. A method for fabricating an image sensor comprising: preparing a first conductive substrate; forming first trenches in the first conductive substrate to define an active region and device isolation regions; forming a gate electrode over the active region of the first conductive substrate; forming a second conductive impurity region in the active region of the first conductive substrate; forming a floating diffusion region on one side of the gate electrode in the active region of the first conductive substrate; etching a predetermined portion of the second conductive impurity region and a predetermined portion of the active region of the first conductive substrate to form a second trench between the gate electrode and the first trench, wherein the first trenches are deeper than the second trench; and burying a first conductive epitaxial layer in the second trench by in-situ doping first conductive impurities while growing the first conductive epitaxial layer, wherein the first conductive epitaxial layer includes one of Si and SiGe.