Patent ID: 6319820
Filing Date: 2001-11-20
Classification: H01L

Abstract:
A fabrication method for a dual damascene structure comprising:providing a substrate;forming a hydrogen silsequioxane layer (HSQ) to cover the substrate;thermal curing the HSQ layer;forming a hard mask layer on the thermal cured HSQ layer to cover a portion of the thermal cured HSQ layer;performing an E-beam curing on a remaining exposed portion of the thermal cured HSQ layer to transform the remaining exposed portion of the thermal cured HSQ layer into an E-beam cured HSQ layer;removing the hard mask;performing a wet etching to selectively remove the thermal cured HSQ layer to form a via hole and to expose a part of the substrate;forming a patterned photoresist layer on the E-beam cured HSQ layer and a photoresist layer partially filling the via to cover the exposed past of the substrate, wherein the patterned photoresist layer exposes a part of the E-beam cured HSQ layer and the via hole;selectively removing the exposed part of the E-beam cured HSQ layer to form a trench above the via hole;removing the photoresist layer on the E-beam cured HSQ layer and the photoresist layer in the via hole; andforming a conductive material to fill the trench and the via hole.