Patent ID: 8912586
Filing Date: 2014-12-16
Classification: H01L

Abstract:
1. A semiconductor device comprising: bit lines formed over a semiconductor substrate; spacers formed at sidewalls of the bit lines; a lower electrode including an upper portion with a cylinder structure and a lower portion with a concave structure formed over a plug exposed between the spacers; and a dielectric film and an upper electrode formed over the lower electrode, wherein the dielectric film and the upper electrode are formed over only an inner side of the lower electrode at a first region where one of the spacers is formed over an outer side of the lower electrode, wherein the dielectric film and the upper electrode are formed over opposing sides of the upper portion of the lower electrode, wherein the bit lines are disposed beside the lower portion of the lower electrode and below the upper portion of the lower electrode, and wherein top surfaces of the bit lines are at or below a transition between the upper portion of the lower electrode and the lower portion of the lower electrode.