Patent ID: 9406609
Filing Date: 2016-08-02
CPC Classification: H01L

Claim Text:
1. A manufacturing method of an opening structure, comprising: forming a multi-layer structure on a substrate, wherein the multi-layer structure comprises a plurality of conductive layers and a plurality of first dielectric layers, the conductive layers and the first dielectric layers are alternately stacked, and heights of the conductive layers located in a first region are lower than heights of the conductive layers located in a second region; forming a second dielectric layer, the second dielectric layer covering the multi-layer structure; forming a patterned mask layer on the second dielectric layer; forming a first filling layer in the second region, the first filling layer covering the second dielectric layer exposed by the patterned mask layer; forming a plurality of first openings by using the first filling layer and the patterned mask layer as a mask, the first openings exposing the conductive layers in the first region; removing the first filling layer; forming a second filling layer, the second filling layer filling the first openings; and forming a plurality of second openings by using the second filling layer and the patterned mask layer as a mask, the second openings exposing the conductive layers in the second region.