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Title:Novel nanomanufacturing methods for bottom-up III-V nanowires and van der Waals epitaxy of monolayer MoS2
Author(s):Jung, Kyooho
Director of Research:Li, Xiuling
Doctoral Committee Chair(s):Li, Xiuling
Doctoral Committee Member(s):Lyding, Joseph W.; Zhu, Wenjuan; Nam, Sungwoo
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):nanowire
Molybdenum disulfide (MoS2)
array
Abstract:Nano materials such as nanowires and 2-dimensional (2-D) molybdenum disulfide (MoS2) have received tremendous attention over the past few decades. Numerous applications have been proposed such as nanowire MOSFETs, nanowire electrical generators, nanowire biosensors, nanowire single photon detectors, MoS2 transistors, and MoS2 photodetectors. Some of these devices outperform state-of-the-art commercial products, but none of these nano material based devices have been commercialized up to date. One of the biggest barriers for industries to use these nano materials is a lack of mass fabrications methods. For nanowires, obtaining a large area planar array of nanowires is extremely difficult and no known method can achieve a high-density large-area array of precisely positioned nanowires. Although there has been huge progress over the past few years, the yield and density of planar nanowire arrays from the reported literature are far from required values for industrial use. For MoS2, obtaining a single-crystal phase with a wafer-scale uniform monolayer is needed in order for the material to be mass fabricated. Although wafer scale monolayer MoS2 has successfully been grown, it contained a high density of grain boundaries which would cause non-uniform performance when mass produced into nano-scale devices. In this dissertation, general pathways for commercialization of nanowire and MoS2 based devices will be explained as well as the backgrounds on the nanowire/MoS2 field. Also, state-of the art methods for achieving planar nanowire arrays and growing monolayer MoS2 will be discussed. In a later section, a new method will be proposed that shows the highest yield and density of planar nanowires ever reported. A growth method for obtaining large-scale single-crystal monolayer MoS2 will be proposed as well.
Issue Date:2016-06-10
Type:Thesis
URI:http://hdl.handle.net/2142/92891
Rights Information:Copyright 2016 Kyooho Jung
Date Available in IDEALS:2016-11-10
Date Deposited:2016-08


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