Patent ID: 9202707
Filing Date: 2015-12-01
Classification: H01J,H01L

Abstract:
1. A semiconductor device manufacturing method that includes introducing a processing gas into a parallel plate type plasma processing apparatus including an upper electrode and a lower electrode, applying a high frequency power to the lower electrode, generating a plasma within the plasma processing apparatus, etching with the plasma a multilayer film including a first film and a second film with differing dielectric constants alternately stacked on a substrate using a photoresist layer arranged on the multilayer film as a mask, and forming the multilayer film into a stepped configuration, the semiconductor device manufacturing method comprising: a first step of etching the first film using the photoresist layer as the mask; a second step of adjusting a pressure within a processing chamber of the plasma processing apparatus to be greater than or equal to 6 Torr and less than or equal to 30 Torr, generating the plasma by applying a first high frequency power for biasing and a second high frequency power for plasma generation to the lower electrode, and etching the photoresist layer using the generated plasma to reduce an area of the photoresist layer in a lateral direction; a third step of etching the second film using the photoresist layer and the first film, which are previously etched by the first and second steps, respectively as the mask; and repeating the first step through the third step a predetermined number of times.