Patent ID: 6780760
Filing Date: 2004-08-24
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device having a contact plug that electrically connects different conductive regions at specified locations that are formed with an interlayer dielectric layer being interposed therebetween over a semiconductor substrate, the method for manufacturing a semiconductor device comprising:forming a hole in the interlayer dielectric layer at a specified location that covers a lower conductive layer region that is one of the different conductive regions, the hole reaching the lower conductive layer region; enlarging an upper end region of the hole greater than a practical hole diameter; embedding the hole with a plug metal; removing a part of the interlayer dielectric layer together with an unnecessary portion of the plug metal to a level where the upper end region that is greater than the practical hole diameter disappears; and forming an upper conductive layer region that is another of the different conductive regions to be connected to the plug metal.