Patent ID: 8969162
Filing Date: 2015-03-03
Classification: H01L

Abstract:
1. A method for fabricating a three-dimensional semiconductor device comprising: forming a first electrode structure on a substrate, the first electrode structure having first electrodes which are stacked on the substrate; and forming a second electrode structure on the first electrode structure, the second electrode structure having second electrodes which are stacked on the first electrode structure; wherein the first electrodes and the second electrodes are formed of substantially a same material at substantially a same time, wherein each of the first and second electrodes has a horizontal portion parallel with the substrate and an extension portion extending from the horizontal portion along a direction penetrating an upper surface of the substrate; the horizontal portions of the first and second electrodes are gradually shortened as a distance between the first and second electrodes and the substrate increases; and the substrate is closer to top surfaces of the extension portions of the first electrodes than to the horizontal portion of at least one of the second electrodes; wherein the forming of the first and second electrode structures comprises: sequentially forming a first mold structure defining first recess regions and a second mold structure defining second recess regions on the first mold structure; and forming the first and second electrodes in the first and second recess regions, respectively, wherein the first and second electrodes are formed of substantially a same material at substantially a same time.