DIELECTRIC DEGRADATION OF CU SIO2/SI STRUCTURE DURING THERMAL ANNEALING/

The impact of Cu on the dielectric SiO2 layer was studied using a Cu/S iO2/Si metal oxide semiconductor capacitor and rapid thermal annealing (RTA) treatment. With the RTA treatment, no chemical reaction was obs erved up to 900 degrees C; however, dielectric degradation occurred fo llowing RTA at 300 degrees C for 60 s and became worse with the increa se of annealing temperature. The interface-trap density at the SiO2/Si interface also increased from 5 x 10(10) to 5 x 10(13) eV(-1) cm(-2) after 800 degrees C RTA treatment. The RTA anneal introduced a large n umber of positive Cu ions into the dielectric SiO2 layer. Under bias-t emperature stress, Cu ions drift quickly in the SiO2 layer and may dri ft across the SiO2/Si interface and enter the Si substrate. With the u se of 1200 Angstrom thick TiN and TiW barrier layers, respectively, th e dielectric strength of the Cu/(barrier)/SiO2/Si structures was able to remain stable up to 500 and 600 degrees C.