Patent ID: 7901976
Filing Date: 2011-03-08
Classification: H01L

Abstract:
1. A method of forming an image sensor comprising: depositing a layer of conductive material comprising titanium (TI) on a surface of a substrate and patterning the layer to form a number of local interconnect (LI) lines; depositing a first dielectric material including silicon nitride over the number of LI lines on the substrate, to substantially cover the LI lines; etching the first dielectric material to form spacers adjacent to sidewalls of at least one of the number of LI lines, to expose at least a portion of a top surface of the LI line and to remove the silicon nitride from the surface of the substrate between the spacers to reduce optical reflectance from the sensor; and forming a silicon oxide layer over the spacers and the number of LI lines to form an inter-layer dielectric (ILD) over the spacers and the number of LI lines, wherein the spacers formed adjacent to sidewalls of the LI lines minimize sidewall loss due to oxidation during deposition of the ILD.