Patent ID: 6599437
Filing Date: 2003-07-29
Classification: H01L

Abstract:
A method of etching a pattern in an organic coating layer overlying a semiconductor substrate, comprising the following steps:a) a main etch step, wherein essentially the entire thickness of said organic coating layer is etched using a plasma generated from a first source gas comprising a fluorocarbon gas and a non-carbon-containing, halogen-comprising gas, and wherein a first bias is applied to said substrate during said main etch step; followed by b) an overetch step, wherein residual organic coating material remaining after said main etch step is removed by exposing said residual organic coating material to a plasma generated from a second source gas consisting essentially of a chlorine-comprising gas, an oxygen-comprising gas, and an inert gas, and wherein a second bias which is lower than said first bias is applied to said substrate during said overetch step.