Patent ID: 7268080
Filing Date: 2007-09-11
Classification: H01L,Y10S

Abstract:
1. A method for printing a contact on a semiconductor substrate, the method comprising: printing a negative of the contact on a resist layer, wherein the printing comprises illuminating a high transmission attenuated phase shifting mask (HT mask); stripping unexposed portions of the resist layer to expose an antireflective coating layer; etching the antireflective coating layer to remove exposed portions of the antireflective coating layer not covered by the negative of the contact and to expose a hard mask layer; trim etching said antireflective coating layer; performing a pattern reversal to cure exposed portions of the hard mask layer not covered by the antireflective coating layer; stripping the negative of the contact on said resist layer and uncovered portions of the hard mask layer to expose an ILD (interlevel dielectric) layer; and dry etching the exposed portion of the ILD layer to expose a top surface of a semiconductor substrate.