Patent ID: 9209239
Filing Date: 2015-12-08
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, the method comprising: forming a metal interconnection layer, a first interlayer insulating layer, and an insulating layer for capacitor support over a semiconductor substrate; forming a trench for a reservoir capacitor by etching the insulating layer for capacitor support and the first interlayer insulating layer to expose the metal interconnection layer; forming a barrier metal layer over an inner surface of the trench; forming a sacrificial insulating layer over the barrier metal layer in a lower portion of the trench; performing a cleaning process to remove the barrier metal layer exposed at a sidewall of the trench so as to form a barrier metal pattern, a bottom of the insulating layer for capacitor support being disposed higher than each upper surface of the barrier metal pattern after the cleaning process is performed; removing the sacrificial insulating layer; and forming a lower electrode over the barrier metal pattern in the trench and an exposed sidewall of the first interlayer insulating layer after the removing the sacrificial insulating layer.