Patent ID: 7772014

Claim:
A method of manufacturing a semiconductor device, comprising: forming transistors over a semiconductor substrate; forming a pre-metal dielectric layer over the transistors; forming electrical contacts in the pre-metal dielectric layer that electrically contact the transistors; forming ferroelectric random access memory (FeRAM) capacitors over the dielectric layer, including: forming a first barrier layer of the FeRAM capacitors over the electrical contact and the pre-metal dielectric layer by conducting deposition and densification of a titanium nitride layer, wherein the first barrier layer of the FeRAM capacitors is a stack of multiple densified titanium nitride layers; forming a second barrier layer over the first barrier layer such that the first and second barrier layers are located over the electrical contact and the pre-metal dielectric layer, the second barrier layer having an elemental composition different from the first barrier layer; forming a lower capacitor electrode over the second barrier layer; forming a ferroelectric dielectric layer comprising lead, zirconium and titanium over the lower capacitor; and forming an upper capacitor electrode over the ferroelectric dielectric layer; forming interlevel dielectric layers over the FeRAM capacitors; and forming interconnects over and within the interlevel dielectric layers to interconnect the transistors and FeRAM capacitors.