Patent ID: 8119439
Filing Date: 2012-02-21
Classification: H01L

Abstract:
1. A method of manufacturing an image sensor, comprising: forming a photoelectric conversion device in a substrate; forming an etch stop layer on the photoelectric conversion device, the etch stop layer covering a front surface of the substrate; forming an insulating layer on the etch stop layer; forming a first metal layer on the insulating layer; etching the first metal layer to form a reflection pattern and a first interconnection pattern on the first insulating layer, the first interconnection pattern being spaced apart from the reflection pattern, wherein the reflection pattern is vertically aligned with the photoelectric conversion device and is formed above a central region of the photoelectric conversion device, and the first interconnection pattern is not vertically aligned with the photoelectric conversion device; forming an air gap in the insulating layer between the reflection pattern and the first interconnection pattern, wherein the air gap partially exposes a surface of the etch stop layer; and forming a gap-fill oxide covering the reflection pattern and the first interconnection pattern, and filling an upper portion of the air gap.