Etch residue clean with aqueous HF/organic solution

• Main Authors: WESTMORELAND DONALD L, LI LI, YATES DONALD L
• Format: Patent
• Language: English
• Published: 27.02.2001
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; SEMICONDUCTOR DEVICES; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS

A method for cleaning polymer film residues from in-process integrated circuit devices is disclosed. Specifically, a method for forming a contact via in an integrated circuit is disclosed in which the formation of a metallization conductive element is exposed through a dry anisotropic etch. During the etch, a polymer film residue forms from masking materials, and coats the newly-formed via. The polymer film may have metals incorporated metals therein from the metallization conductive element. A fluorine based etchant is used to remove the polymer film. Protection of the metallization conductive element during the cleaning process is accomplished with passivation additives comprising straight, branched, cyclic, and aromatic hydrocarbons. Attached to the hydrocarbons are functional groups comprising at least 3 hydroxyls.