Patent ID: 11871560
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 9:
10. The method of claim 9, wherein said etching part of the initial second dielectric layer by taking the second mask layer as a mask, so as to form the second dielectric layer with the trapezoidal structure comprises:
etching part of the second carbon layer and part of the first carbon layer by taking the second mask layer as the mask, so as to form the second carbon layer with a trapezoidal structure and the first carbon layer with a trapezoidal structure; and
etching part of the second polycrystalline silicon layer by taking the second carbon layer with the trapezoidal structure and the first carbon layer with the trapezoidal structure as a mask, so as to form the second polycrystalline silicon layer with the trapezoidal structure;
wherein the second carbon layer with the trapezoidal structure, the first carbon layer with the trapezoidal structure and the second polycrystalline silicon layer with the trapezoidal structure form the second dielectric layer with the trapezoidal structure.