In the past few years, exciting developments in the synthesis and novel device demonstration of one-directional (1D) semiconductor nanowires have given rise to an enormous optimism. Interesting characteristics such as high surface to volume ratio, quantum confinement, and simple and low cost synthesis process are opening new frontiers in novel electronic and photonic devices. One much debated issue of interfacing and integrating such nano-structures in a massively large number of devices and systems has attracted the attention of research groups all over the world and various approaches were proposed. This talk will give an overview of the recent progress and future challenges in the construction of large and complex systems with 1D semiconductor nanowires.
Metal patterned lines on a substrate have been annealed and broken down into isolated linear arrays of alloyed metal nanoscale droplets. These droplets are selectively fabricated across large-scale areas by controlling the location metal is present on a substrate. The metal instability and formation into nanoscale particles forms similar to studies in Rayleigh Instability of metal at an elevated temperature. Experimental results discussed here show a change in droplet diameter and formation by controlling the metal width.
Highly lattice-mismatched InP/Si nanowire heterostructures were synthesized using the metal-organic chemical vapor deposition (MOCVD) process at 450 ºC. The InP nanowire diameter as high as 500 nm is much thicker than the critical diameter (~24 nm for InP/Si) predicted by a recent theoretical work on the coherent growth of nanowire heterostructures. We investigated possible factors that lead to the unusually large diameters in a highly latticemismatched material system. Dislocations formed at the interfacial plane of the heterostructure due to high lattice mismatch were found to contribute to the growth of nanowires with very large diameters. An extra pair of dislocation lines at the interfacial plane was found to support an increase in nanowire diameter by ~12 nm.
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