Patent ID: 8105913
Filing Date: 2012-01-31
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, the method comprising: sequentially forming an interlayer insulating film defining a contact plug, a lower electrode oxide film, and a hard mask film over a semiconductor substrate; etching the hard mask film with a mask comprising a dummy pattern and a cell pattern to form a hard mask pattern wherein a first trench is formed in a dummy pattern region and a second trench is formed in a cell pattern region; forming an upper oxide film over the hard mask pattern, wherein the upper oxide film exposes a first hole of the first trench and covers a second hole of the second trench; forming a capping film that buries the first trench and does not bury the second trench; and etching the lower electrode oxide film with the capping film and the hard mask pattern as a mask to form a lower electrode trench that exposes the contact plug.