Portland State University. Department of Chemistry
Shankar B. Rananavare
Term of Graduation
Date of Publication
Doctor of Philosophy (Ph.D.) in Chemistry
Nanostructured materials, Nanowires
1 online resource (2, xii, 144 pages)
Contemporary VLS-SiNW synthetic methods employ CVD and laser ablation methods that produce single crystalline SiNW; which can be doped by co-flowing appropriate dopants, such as diborane (p-type) and phosphine (n-type). Not only are these gases toxic (non-green), but also the synthetic methods used are costly requiring elaborate instrumental assembly. This thesis presents a low-cost and "green" method in synthesizing and doping of SiNW in a glass tube. It was found that by selecting the appropriate metal catalyst, precursor reactants, and the reaction conditions both SiNW and carbon nanotube (CNT) can be synthesized on metallic (aluminum and copper), semiconducting (silicon) and insulating substrates (borosilicate and fiber glass). By choosing an appropriate NW growth catalyst (antimony and aluminum) or dopantcontaining organic compounds soluble in the silicon precursor (diphenylsilane) SiNW can be readily doped. During these studies, formation of metallurgical junctions between nanowires was observed due to surface adhering growth of SiNWs. Such junctions are useful for next generation of nanoarchitecture based on grid structure as advocated by Likharev94. The methods developed here can address some of the major issues in integrating SiNWs in nanoelectronics related to reducing their contact resistance, improved doping and crafting metallurgical junctions.
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Chan, Joo Chick, "A Novel Approach to the Synthesis of Silicon Nanowires" (2008). Dissertations and Theses. Paper 5956.