Patent ID: 9281277
Filing Date: 2016-03-08
CPC Classification: H01L

Claim Text:
1. A method of forming a wiring structure, the method comprising: forming, on a substrate, a first insulation layer that includes a plurality of trenches therein; forming a barrier layer in the plurality of trenches and on an upper surface of the first insulation layer; forming a metal layer on the barrier layer to fill the plurality of trenches; planarizing upper portions of the metal layer and the barrier layer until the upper surface of the first insulation layer is exposed to form a metal layer pattern having a first oxide layer thereon and a barrier layer pattern having a second oxide layer thereon; performing an ultraviolet (UV) pre-treatment process using UV and a reducing gas on the metal layer pattern and the barrier layer pattern to remove the first and second oxide layers thereon, respectively, so as to form a plurality of wiring patterns, wherein the plurality of wiring patterns include the barrier layer pattern and the metal layer pattern; forming a protection layer pattern directly on top surfaces of the plurality of wiring patterns, the protection layer pattern including a material having a high reactivity with respect to oxygen; partially removing the first insulation layer to form recesses between the plurality of wiring patterns; and forming a second insulation layer on the protection layer pattern and the first insulation layer to form an air gap between the plurality of wiring patterns.