Patent attributes
A semiconductor device manufacturing method for etching a multilayer film using a mask is provided. The method includes (a) supplying a first gas containing hydrogen, hydrogen bromide, nitrogen trifluoride and at least one of hydrocarbon, fluorocarbon and fluorohydrocarbon into the processing chamber and exciting the first gas to etch the multilayer film from a top surface of the multilayer film to a predetermined position in a stacked direction of the multilayer film; and (b) supplying a second gas that does not substantially contain hydrogen bromide and contains hydrogen and nitrogen trifluoride and at least one of Thydrocarbon, fluorocarbon and fluorohydrocarbon into the processing chamber and exciting the second gas to etch the multilayer film from the predetermined position of the multilayer film to a top surface of the etching stop layer.
