Growth and properties of LPCVD WSiN barrier layers
In this work the low-temperature low pressure chemical vapour deposition (LPCVD) of WSiN compounds in the WF6NF3SiH4Ar system is presented. Layers were deposited on oxidised Si-wafers at 385 and 250C. Thermodynamical calculations for the WF6:NF3:SiH4:Ar system at different ratios of gas components were made. Simultaneously an experimental study was performed at different deposition conditions. At 385C, crystalline layers, and at 250C, amorphous layers with smooth surfaces were obtained under several conditions. The resistivity of WSiN layers deposited at 385C decreases from 3000 ?? cm to 550 ?? cm as the W/N ratio increases from 1.3 to 10.2.
lpcvd diffusion barrier copper metallization