Patent ID: 7470632

Claim:
A method of depositing a silicon dioxide-comprising layer doped with at least one of phosphorus, boron, and germanium, comprising: placing a semiconductor a substrate within a deposition chamber; and introducing at least two gaseous precursors into the chamber, said precursors collectively comprising silicon, an oxidizer comprising oxygen and at least one of phosphorus, boron, and germanium dopant, said introducing performed over at least two different time periods and under conditions effective to deposit a doped silicon dioxide layer on the substrate, wherein said gaseous precursor comprising said dopant is introduced into the chamber during a time interval during which substantially no oxidizer precursor is introduced into said chamber, such that at some point during the depositing of said doped silicon dioxide, said doped silicon dioxide is preferentially deposited within at least some gaps on the substrate relative to atop substrate structure adjacent said gaps.