Patent ID: 6964921
Filing Date: 2005-11-15
Classification: H01L

Abstract:
1. A method for forming a bit line of a flash device, the method comprising the steps of: (a) forming a barrier film, an interlayer insulation film, and a metal hard-mask film sequentially on a semiconductor substrate, on which a bit line contact plug is formed; (b) forming a metal hard-mask film pattern for opening a bit line area corresponding to the bit line contact plug; (c) forming a bit line trench; (d) forming a bit line metal film on the entire structure including the metal hard-mask film to bury the bit line trench; and, (e) removing the bit line metal film and the metal hard mask film on the interlayer insulation film with a metal material by means of CMP, wherein the metal hard-mask film and the bit line metal film are formed using the same metal material so that the metal hard-mask film and the bit line metal film can be removed at the same time by the CMP.