Chemical soak preclean for selective metal fill and chemical adsorption

Abstract

Embodiments described herein generally relate to semiconductor device fabrication. More specifically, embodiments of the present disclosure relate to methods of removing metal oxides during semiconductor device manufacturing. The method includes performing a first soak process on the semiconductor device structure, forming a metal fill material in at least one feature, and performing a second soak process on the semiconductor device structure. The semiconductor device structure includes at least one feature formed in a dielectric layer of the semiconductor device structure. The first soak process includes flowing a first precursor gas over the at least one feature. The metal fill material is formed by partially filling the at least one feature where a gap region forms between a sidewall of the at least one feature and the metal fill material. The second soak process includes flowing a second precursor gas over the at least one feature and the metal fill material.

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