Patent ID: 7897454
Filing Date: 2011-03-01
Classification: H01L

Abstract:
1. A method for fabricating a metal-insulator-metal capacitor, comprising the following steps: forming a second dielectric layer and a metal wiring therein on a semiconductor substrate; forming a third dielectric layer and a plug therein on the second dielectric layer, the plug being connected with the metal wiring; forming an interlayer dielectric layer on the third dielectric layer above the semiconductor substrate; forming an insulation trench in the interlayer dielectric layer to run through the interlayer dielectric layer; filling the insulation trench with an insulation material to form an insulation structure; forming two metal trenches in the interlayer dielectric layer to run through the interlayer dielectric layer; the metal trenches being located on two sides of the insulation trench respectively and each sharing a trench wall with the insulation trench; and simultaneously filling the metal trenches with a metal material to form electrodes of the capacitor, one of the electrodes being connected with the metal wiring via the plug; said metal material comprises aluminum copper alloy.