Patent ID: 6444584
Filing Date: 2002-09-03
Classification: H01L

Abstract:
A method for forming a patterned composite stack layer within a microelectronics fabrication comprising:providing a substrate; forming over the substrate a blanket first silicon layer; forming upon the blanket first silicon layer a blanket silicon containing dielectric layer; forming upon the blanket silicon containing dielectric layer a blanket second silicon layer; forming upon the blanket second silicon layer a blanket organic polymer anti-reflective coating (ARC) layer; forming upon the blanket organic polymer anti-reflective coating (ARC) layer a patterned photoresist layer; and etching sequentially while employing the patterned photoresist layer as a photoresist etch mask layer the blanket organic polymer anti-reflective coating (ARC) layer, the blanket second silicon layer, the blanket silicon containing dielectric layer and the blanket first silicon layer to form a patterned composite stack layer comprising a patterned second silicon layer coextensive with a patterned silicon containing dielectric layer in turn coextensive with a patterned first silicon layer, where the sequential etching is undertaken employing a single plasma etch method employing an etchant gas composition which upon plasma activation forms a chlorine containing etchant species.