Evaluation and integration of metal gate electrodes for future generation dual metal CMOS

An overview of factors that contribute to the effective work function of metal gate electrodes are presented and reasons for disparity in reported values for effective work function of similar metals from different groups are discussed. Utilizing a standardized technique to accurately extract the effective work function of metal gates, the potential of amorphous metal gate materials and hafnium-based electrodes is presented. Also, the influence of metal gate materials and processing on the physical and electrical stability of the high-k metal gate stacks are discussed.