Patent ID: 7510967
Filing Date: 2009-03-31
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: forming a metal interconnect on a substrate; forming a refractory metal layer containing titanium (Ti) or tantalum (Ta) on a surface of said metal interconnect; forming an insulating interlayer so as to cover said refractory metal layer; selectively etching said insulating interlayer with an etchant gas containing an organic fluoride to form a hole, in which the said refractory metal layer is exposed; treating an interior of said hole with an organic chemical solution to remove fluorinated compounds of Ti or Ta while leaving fluorocarbons on the surface of said refractory metal layer, said fluorinated compounds of Ti or Ta and said fluorocarbons being generated during said etching step and present in the interior of said hole; and performing plasma-treatment for the interior of said hole to remove the fluorocarbon.