Patent ID: 7602068
Filing Date: 2009-10-13
Classification: H01L

Abstract:
1. A thick wire structure, comprising: an underlying wire formed in a FSG (fluorine doped silicate glass) dielectric material; a first nitride cap layer covering the underlying wire; an interlevel layer formed on the first nitride cap layer; a MIM capacitor embedded in a portion of the interlevel layer; a MIM etch stop cap layer formed on the MIM capacitor, the MIM etch stop cap layer having a thickness greater than the first nitride cap; a second nitride cap layer formed on the interlevel layer; an FSG dielectric layer formed on the second nitride cap; a via in alignment with the underlying wire, extending proximate to the first nitride cap layer; and a trough in substantial axial alignment with the via and having a width larger than the via and extending to the second nitride cap layer.