Comparison of propagation delay characteristics for single-walled CNT bundle and multiwalled CNT in global VLSI interconnects

Multi-walled carbon nanotubes (MWNT) have provided potentially attractive solution over single-wall carbon nanotube (SWNT) bundles at current very large scale integration (VLSI) technologies. This paper presents a comprehensive analysis of propagation delay for both MWNT and SWNT bundles at different interconnect lengths (global) and shows a comparison of equivalent number of SWNTs in bundle and shells in MWNTs for specified propagation delays and lengths. It has been observed that irrespective of the type of CNTs, propagation delay increases with interconnect lengths. For same propagation delay performance, the number of SWNTs required in a bundle are found to be more than number of shells in MWNT for a given interconnect length.