| http://www.w3.org/ns/prov#value | - The Cu (II) precursors require use of an external reducing agent such as hydrogen or alcohol to deposit copper films that are largely free of impurities, while Cu (I) precursors can deposit pure copper films without using an external reducing agent via a bimolecular disproportionation reaction that produces a Cu (II) ??-diketonate as a volatile byproduct.
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