Patent ID: 6538272
Filing Date: 2003-03-25
Classification: H01L

Abstract:
A semiconductor storage device comprising a MOS transistor formed on a semiconductor substrate, and a capacitor having a lower electrode, an upper electrode, and a dielectric between the lower and upper electrodes, said lower electrode of the capacitor being electrically connected with a source/drain region of the MOS transistor through a contact plug and a barrier metal provided on or above the contact plug, said barrier metal having upper, lower and side surfaces, comprising:an adhesion layer having upper, lower and side surfaces and being disposed between the contact plug and the barrier metal, the adhesion layer only covering the lower surface of the barrier metal: an anti-oxygen-permeation film being formed only on the side surfaces of the barrier metal and the adhesion layer; and the lower electrode only covering the upper surfaces of the barrier metal and anti-oxygen-permeation film.