Patent ID: 7239003
Filing Date: 2007-07-03
Classification: H01L

Abstract:
1. An image sensor comprising: an active layer of a first conductivity type formed in a substrate; a charge transfer region formed in said active layer; a photodiode formed in said active layer adjacent said charge transfer region, said photodiode comprising a region of a second conductivity type between regions of said active layer of said first conductivity type; a charge collection region in said active layer for receiving charges transferred from said photodiode region; an isolation region formed adjacent said active layer, said isolation region comprising a trench having sidewalls; a layer of insulating material comprising silicon nitride, said layer of insulating material being in contact with at least a portion of said trench sidewalls; a non-conformal insulating liner comprising an oxide material formed on said layer of insulating material, said non-conformal insulating liner having a first thickness at a bottom portion of said trench and a second thickness at an upper portion of said trench, said first thickness being greater than said second thickness; and a conductive material formed in contact with said non-conformal insulating liner within said trench.