Patent ID: 8298911

Claim:
A method of forming a wiring structure, comprising: forming a first insulation layer on a substrate, the first insulation layer comprising a group of hydrocarbon (C α H β ) wherein α and β are integers; forming a second insulation layer on the first insulation layer, the second insulation layer being avoid of the group of hydrocarbon; forming a first opening through the first and the second insulation layers by etching the first and the second insulation layers; forming a damaged pattern and a first insulation layer pattern by performing a surface treatment on a portion of the first insulation layer corresponding to an inner sidewall of the first opening; forming a sacrificial spacer in the first opening on the damaged pattern and on the second insulation layer; forming a conductive pattern in the first opening; and removing the sacrificial spacer and the damaged pattern to form a first air gap between the conductive pattern and the first insulation layer pattern, and to form a second air gap between the conductive pattern and the second insulation layer.