Integration of Ta–N Thin Film Resistors on Anodic Alumina MCM-D Substrate

The aim of this work is to evaluate the changes in microstructures and electrical properties of a tantalum nitride (Ta–N) thin film integrated on an aluminum anodization multichip module deposited (MCM-D) substrate. A Ta–N resistor with a thickness of 100 nm was integrated at the bottom layer of the MCM-D substrate using rf reactive sputtering. Effects of aluminum anodization process on the Ta–N thin film resistor were studied. The results show that the oxide bulges composed of Ta2O5 and Ta–O–N are formed at the Ta–N film surface due to the effect of the upper layer of porous anodic alumina. The resistivity and the temperature coefficient of resistance of the Ta–N resistor remain unchanged. The integrated resistor is more stable owing to the protection of the oxide bulges.