Patent ID: 7858270
Filing Date: 2010-12-28
Classification: H01L

Abstract:
1. A method of dry developing a multi-layer mask on a substrate, comprising: disposing said substrate comprising said multi-layer mask in a plasma processing system, wherein said multi-layer mask comprises a lithographic layer overlying a second mask layer and wherein said lithographic layer comprises a feature pattern formed therein using a lithographic process, said feature pattern having a first critical dimension (CD); establishing a process recipe configured to cause a deposition condition on the sidewalls of said feature pattern as said feature pattern is transferred to said second mask layer, wherein said deposition condition is configured to cause a reduction from said first CD in said lithographic layer to a second CD in said second mask layer; introducing a process gas to said plasma processing system according to said process recipe, wherein said process gas comprises a fluorocarbon gas and a hydrofluorocarbon gas; forming plasma from said process gas in said plasma processing system according to said process recipe; and exposing said substrate to said plasma in order to transfer said feature pattern in said lithographic layer to said underlying second mask layer, wherein said lithographic layer comprises a light-sensitive layer, and said second mask layer comprises a silicon-containing anti-reflective coating (ARC) layer, wherein said process recipe comprises a ratio between an amount of said fluorocarbon gas and an amount of said hydrofluorocarbon gas, and an etch time, and wherein said ratio between an amount of said fluorocarbon gas and an amount of said hydrofluorocarbon gas ranges from approximately 1.5 to approximately 5.