Patent ID: 7153752
Filing Date: 2006-12-26
Classification: H01L

Abstract:
1. A method for forming a capacitor and a contact hole of a semiconductor device simultaneously comprising the steps of: depositing a metal layer on a substrate; depositing a titanium nitride (TiN) layer directly on the metal layer; forming a pattern on the TiN layer and making a capacitor part and a contact hole part using the pattern, the capacitor part comprising some portion of the metal layer and the TiN layer as a lower metal layer of the capacitor, the contact hole part comprising another portion of the metal layer and the TiN layer; forming an insulating layer with a predetermined thickness over the substrate including the capacitor part and the contact hole part; forming an interlayer dielectric (ILD) layer on the insulating layer, the ILD layer being relatively thicker than the insulating layer; forming a first photoresist pattern on the ILD; removing some parts of the ILD layer by an etching process using the first photoresist pattern as a mask in order to form openings on the insulating layer in the capacitor part and the contact hole part; forming a second photoresist pattern over the ILD layer including the openings; removing some part of the insulating layer and the TiN layer in the contact hole part by an etching process using the second photoresist pattern as a mask in order to extend the opening in the contact hole part to the metal layer; removing the second photoresist pattern; and filling the openings with tungsten to form tungsten plugs.