Interconnection Of Electrodes Using Field Emission Induced Growth Of Nanowires

FAIZHAL BIN BAKAR

Publication

Interconnection Of Electrodes Using Field Emission Induced Growth Of Nanowires

FAIZHAL BIN BAKAR

Abstract

This thesis concerns the interconnection of electrodes using field emission induced growth (FEIG) of W nanowires. We seek to understand the process through simulation of the growth phenomena seen at both the cathode and the anode. Better experimentation and understanding of FEIG will bring a step closer to understanding of the formation of nanosized connection between electrodes. Results of the simulation of electron and W ions trajectories at the beginning stage of the nanowire growth suggests a formation of a conical supporting structure at the base of the nanowire as well the formation of a nanowire with a diameter that grows at a much smaller rate than its length. Results of simulation at the end stage of the nanowire growth suggest that nanowire growth speed reduces as the nanowire nears the anode. The measured resistance of W nanowire bridge however shows a large ohmic value due to the high resistance of the anode growth due W supply-limited deposition. The anode growth observed is thicker and has a tree-like structure and is deduced to arise from the continual fusing and growth of the cathode which encourages the anode growth as the thicker anode is unlikely to fuse. Preliminary anode simulations suggest that formation of protrusions at the anode will influence incoming electrons and thus the fractal growth of the anode observed. From TEM images, it was deduced that the tree-like anode growth is made up of metal agglomerates, enclosed in a carbonaceous matrix. The low crystallinity observed is deduced to be due to the low electron energy used.