Patent ID: 8735299
Filing Date: 2014-05-27
Classification: H01J,H01L

Abstract:
1. A semiconductor device manufacturing method for forming a step-shaped structure in a substrate by etching the substrate having thereon a multilayer film and a photoresist film provided on the multilayer film and serving as an etching mask, the multilayer film being formed by alternately layering a first film having a first permittivity and a second film having a second permittivity different from the first permittivity, the semiconductor device manufacturing method comprising: a first process for plasma-etching the first film by using the photoresist film as a mask; a second process for exposing the photoresist film to hydrogen-containing plasma and forming a reforming film on a top surface of the photoresist film; a third process for trimming the photoresist film; and a fourth process for etching the second film by using the trimmed photoresist film and the plasma-etched first film as masks, wherein the step-shaped structure is formed in the multilayer film by repeatedly performing the first process to the fourth process in this sequence.