Patent ID: 9048193
Filing Date: 2015-06-02
Classification: H01L

Abstract:
1. A method of forming a multi-floor step pattern structure, comprising: i) forming a stacked structure by alternately stacking a plurality of insulating interlayers and a plurality of sacrificial layers on a substrate; ii) forming a first photoresist pattern on the stacked structure; iii) forming a first preliminary step pattern structure by etching portions of one uppermost insulating interlayer and one uppermost sacrificial layer using the first photoresist pattern as an etching mask; iv) forming a first passivation layer on an upper surface and a side wall of the first photoresist pattern, and on an upper surface of and a side wall of the first preliminary step pattern structure; v) forming a first passivation layer pattern by removing a portion of the first passivation layer formed on the side wall of the first photoresist pattern; vi) forming a second photoresist pattern by removing a side wall portion of the first photoresist pattern exposed by the first passivation layer pattern; vii) forming a second preliminary step pattern structure by etching two exposed insulating interlayers and two underlying sacrificial layers, using the second photoresist pattern as an etching mask; and viii) repeating steps iv) to vii) at least once with respect to the second preliminary step pattern structure to form the multi-floor step pattern structure.