Patent ID: 7476604

Claim:
A method of forming a contact, comprising: forming a via through a dielectric material; cleaning the via using a dilute hydrofluoric (DHF) acid solution and at least one of an ammonium hydroxide hydrogen peroxide mix (APM) or a sulfuric acid hydrogen peroxide mix (SPM), wherein a concentration of HF to H 2 O within the DHF acid solution ranges from about 10:1 to about 500:1, wherein a concentration of NH 4 OH/H 2 O 2 /H 2 O in the APM ranges from about 1:1.2:8 to about 1:2.5:12 and wherein a concentration of H 2 SO 4 /H 2 O 2 in the SPM ranges from about 1:1 to about 5:1; depositing a barrier layer within the via; and depositing metal adjacent the barrier layer.