Patent ID: 8536061
Filing Date: 2013-09-17
Classification: H01L

Abstract:
1. A semiconductor device manufacturing method comprising collectively etching layers of a multilayered film including silicon layers and silicon oxide films alternately stacked on a semiconductor substrate without changing the etching conditions, wherein an etching gas of the etching contains at least two types of group-VII elements and a group-IV element, an energy of ions entering the semiconductor substrate when performing the etching is not less than 100 eV, the at least two types of group-VII elements include F and another group-VII element other than F, a ratio of F in the etching gas to the another group-VII element in the etching gas is 0.5 (inclusive) to 3.0 (inclusive), and a ratio of F in the etching gas to the group-IV element in the etching gas is 0.5 (inclusive) to 3.0 (inclusive).