Methods of forming electrically interconnected lines using ultraviolet

Abstract

Methods of forming electrically interconnected lines using organic compound cleaning agents include the steps of forming a first electrically conductive line on a substrate and then forming a first electrically insulating layer on the first electrically conductive line to electrically isolate the first conductive line from adjacent regions and lines. An organic spin-on-glass (SOG) passivation layer is then formed as a planarization layer on the first electrically insulating layer. The organic SOG layer is then etched-back to define a first etched surface thereon, using a carbon-fluoride gas which also preferably contains argon. The organic SOG layer may even be sufficiently etched back to expose an upper surface of the first electrically insulating layer. The first etched surface is then exposed to an organic compound cleaning agent so that organic residues can be removed from the etched surface so that layers subsequently formed on the etched surface are less susceptible to lift-off and flaking. The organic compound cleaning agents preferably consist of ultraviolet radiation and/or an oxygen containing plasma. After the first etched surface has been cleaned, the first electrically insulating layer is patterned to define a via therein which exposes an underlying portion of the first electrically conductive line. A second electrically conductive line (e.g., second level metallization) is then preferably formed in ohmic contact with the exposed portions of the first electrically conductive line and the ohmic contact therebetween is preferably free of organic residues which might adversely affect contact reliability and resistance.