Patent ID: 7537990
Filing Date: 2009-05-26
Classification: H01L

Abstract:
1. A method of manufacturing semiconductor devices comprising: preparing a semiconductor substrate over which a laminated structure comprising an insulating layer is formed; forming over the insulating layer a resist mask comprising a first opening and a second opening having a greater opening width than an opening width of the first opening; first etching using the resist mask to form a hole which corresponds to the first opening and penetrates the insulating layer and to form a first trench which corresponds to the second opening and is shallower than the hole; forming a deposition film such that said hole is filled; second etching to etch back the deposition film such that the insulating layer is exposed in the first trench and that the deposition film remains in the hole; and third etching using the resist mask and the remaining deposition film for masking to remove the insulating layer exposed in the first trench such that a second trench penetrating the insulating layer is formed.