Patent ID: 11910588
Assignee: NANYA TECHNOLOGY CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for fabricating a crown capacitor comprising:
forming a first supporting layer over a substrate;
forming a second supporting layer above the first supporting layer;
alternately stacking first and second sacrificial layers between the first and second supporting layers to collectively form a stacking structure;
forming a recess extending through the stacking structure;
performing an annealing process to the first and second sacrificial layers;
after performing the annealing process, performing an etching process to the first sacrificial layers at a first etching rate and the second sacrificial layers at a second etching rate greater than the first etching rate, such that each second sacrificial layer and immediately-adjacent two of the first sacrificial layers collectively define a concave portion;
forming a first electrode layer over a surface of the recess, wherein the first electrode layer has a wavy structure;
removing the first and second sacrificial layers; and
forming a dielectric layer and a second electrode layer over the first electrode layer to obtain a crown capacitor.