Patent ID: 6803249
Filing Date: 2004-10-12
Classification: H01L

Abstract:
A method of manufacturing an integrated circuit device on a single semiconductor chip, comprising:providing a substrate of a first conductivity type; forming an epitaxial layer of a second conductivity type on the substrate; and forming transistors and a photodetector at laterally spaced locations on the chip, the transistors and photodetector being defined by active regions within the epitaxial layer and contacts to respective active regions, the contacts being formed above an upper surface of the epitaxial layer in contact with the active regions; wherein a silicon nitride layer is formed as an anti-reflective film in the structure of the photodetector, the silicon nitride layer extending laterally from the photodetector to regions of the chip that include the transistors and performing an insulating function within the structures of the transistors, wherein the contacts are formed after formation of the silicon nitride layer and extend through the silicon nitride layer; and wherein the anti-reflective film is formed by depositing a first oxide layer over the device including over the active regions that define the photodetector, then depositing the silicon nitride layer over the first oxide layer, then depositing a second oxide layer over the silicon nitride layer, and subsequently selectively removing portions of the second oxide layer to expose a substantial portion of the silicon nitride layer over the active regions of the photodetector.