Patent ID: 6319809
Filing Date: 2001-11-20
Classification: H01L

Abstract:
A method to reduce via poison in low-k Cu dual damascene by UV-treatment comprising the steps of:providing a substrate having a first and a second insulative layer separated from each other by an intervening etch-stop layer formed therein said substrate;forming a hole opening in said first and second insulative layers, including said intervening etch-stop layer; thenperforming a first ultraviolet (UV) irradiation over said substrate, including said hole opening, at a wavelength between about 150 to 600 nanometers (nm);forming a trench opening in said second insulative layer over said hole opening in said first insulative layer, thus completing the forming of said dual damascene structure in said substrate; thenperforming a second UV irradiation over said substrate, including said dual damascene structure, at a wavelength between about 150 to 600 nanometers (nm);depositing metal in said dual damascene structure; andremoving excess metal to complete the forming of the UV-irradiated dual damascene of the present invention.