Position-controlled hydrothermal growth of ZnO nanorods on arbitrary substrates with a patterned seed layer via ultraviolet-assisted nanoimprint lithography

Park, Hyeong‐Ho; Zhang, Xin; Lee, Keun Woo; Kim, Ka Hee; Jung, Sang Hyun; Park, Deok Soo; Choi, Young Su; Shin, Hyun Beom; Sung, Ho Kun; Kim, Huy Kang; Kang, Hyoungku; Park, Hyung Ho; Ko, Chul Ki

doi:10.1039/c3ce27069f

Cited by 25 publications

(21 citation statements)

References 41 publications

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“…1c) obtained from the measurements were indexed using polycrystalline wurtzite/zincite ZnO JCPDS card No. 36-1451 and the peaks at 2θ angles of 32°, 34.5° and 36.5° were assigned to (100), (002) and (101) orientation of ZnO, respectively [46,47]. The peak at 33° may be attributed to contamination peak, similar to the case of zinc naphthenate [48].…”

Section: Structural Characterization Of Zno Thin Filmsmentioning

confidence: 77%

Optimization of Transistor Characteristics and Charge Transport in Solution Processed ZnO Thin Films Grown from Zinc Neodecanoate

Tiwale

Senanayak

Rubio‐Lara

et al. 2019

Electron. Mater. Lett.

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Solution processing of metal oxide-based semiconductors is an attractive route for low-cost fabrication of thin films devices. ZnO thin films were synthesized from one-step spin coating-pyrolysis technique using zinc neodecanoate precursor. X-ray diffraction (XRD), UV-visible optical transmission spectrometry and photoluminescence spectroscopy suggested conversion to polycrystalline ZnO phase for decomposition temperatures higher than 400 °C. A 15 % precursor concentration was found to produce optimal TFT performance on annealing at 500 °C, due to generation of sufficient charge percolation pathways. The device performance was found to improve upon increasing the annealing temperature and the optimal saturation mobility of 0.1 cm 2 V −1 s −1 with I ON /I OFF ratio ~ 10 7 was achieved at 700 °C annealing temperature. The analysis of experimental results based on theoretical models to understand charge transport envisaged that the grain boundary depletion region is major source of deep level traps and their effective removal at increased annealing temperature leads to evolution of transistor performance.

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Section: Structural Characterization Of Zno Thin Filmsmentioning

confidence: 77%

Optimization of Transistor Characteristics and Charge Transport in Solution Processed ZnO Thin Films Grown from Zinc Neodecanoate

Tiwale

Senanayak

Rubio‐Lara

et al. 2019

Electron. Mater. Lett.

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“…Thus, hydrothermal synthesis is a more convenient and cost-effective approach for the large-scale preparation of well-ordered ZnO nanowire arrays at low temperatures. Recently, numerous hydrothermal growth methods of ZnO nanowires on various substrates have been vigorously explored 16 17 18 19 20 21 22 23 and are continuously being evolved. Despite the benefits of hydrothermal synthesis of ZnO nanowires, the necessity of a crystalline ZnO seed layer limits the flexibility of this method due to the requirements of additional vacuum technology and high temperature processes 24 25 .…”

mentioning

confidence: 99%

Metal Catalyst for Low-Temperature Growth of Controlled Zinc Oxide Nanowires on Arbitrary Substrates

Kim

Kwon

2014

Sci Rep

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Zinc oxide nanowires generated by hydrothermal method present superior physical and chemical characteristics. Quality control of the growth has been very challenging and controlled growth is only achievable under very limited conditions using homogeneous seed layers with high temperature processes. Here we show the controlled ZnO nanowire growth on various organic and inorganic materials without the requirement of a homogeneous seed layer and a high temperature process. We also report the discovery of an important role of the electronegativity in the nanowire growth on arbitrary substrates. Using heterogeneous metal oxide interlayers with low-temperature hydrothermal methods, we demonstrate well-controlled ZnO nanowire arrays and single nanowires on flat or curved surfaces. A metal catalyst and heterogeneous metal oxide interlayers are found to determine lattice-match with ZnO and to largely influence the controlled alignment. These findings will contribute to the development of novel nanodevices using controlled nanowires.

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“…The hydrothermal growth of ZnO NWs in aqueous solution containing hexamethylenetetramine (HMT) and zinc nitrate is well documented in literature . The patterned layer of ZnO seed crystals provides preferential sites for heterogeneous nucleation, which anisotropically grows leading to periodic pattern of single crystalline ZnO NW assemblies.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Periodic Nanostructure Assemblies by Interfacial Energy Driven Colloidal Lithography

Dev

Choudhury

Abedin

et al. 2014

Adv Funct Materials

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4577www.MaterialsViews.com wileyonlinelibrary.com particles with diameters ranging from tens of nanometers to several micrometers are commercially available; thus, a wide variety of patterns can be fabricated by colloidal lithography. The colloidal lithography technique has been extensively used to fabricate various periodic structures including nanowire/nanopillar arrays of different materials such as Si, ZnO, InP. [6][7][8] Despite being a very successful technique, [ 9 ] the use of colloidal lithography in case of wetchemical synthesis has been very limited. The main limitation in using colloidal lithography in combination with solutionbased synthesis is that the masked region, that is, the contact area between the colloidal sphere and the substrate is very small while the rest of the substrate remains accessible for the solution. So, in a normal approach involving drop casting of solution on a monolayer of colloidal particles, the solution easily penetrates through the interstices between the colloidal spheres and settles down on the substrate making a continuous layer with periodic holes.With respect to pattern fabrication using liquids, superhydrophilic-superhydrophobic micropatterns is a unique and rapidly developing fi eld, which is based on extreme differences in wettability between superhydrophilic and superhydrophobic regions on the same substrate. [ 10,11 ] Enormous research effort is being devoted to understand and control the wettability of the solid surface in order to uniquely and precisely control the geometry, position and the shape of the liquid droplets on the solid surface. In addition to the fabrication of periodic microdroplets, [ 10 ] this technique is also widely used in various other applications such as surface tension confi ned micro channels, [ 12 ] fi lling micro patterns, [ 13,14 ] passive dispensing by dewetting, [ 15 ] controlling bioadhesion, [ 16 ] cell encapsulation droplet arrays [ 17 ] and fabrication of complex micropatterns. [ 18 ] However, this technique is only suitable for large (>50 µm) structures.Here, we combine colloidal lithography with generation of hydrophobic-hydrophilic regions and demonstrate a novel interfacial energy driven colloidal lithography technique to fabricate periodic micron and submicron-size patterns from solution phase. We utilize self-developed periodic wettability of a Si substrate in the presence of self-assembled colloidal silica spheres. The feasibility and the versatility of the concept are demonstrated by fabricating periodically arranged ZnO nanowire (NW) ensembles on sol-gel derived ZnO seed pattern

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Position-controlled hydrothermal growth of ZnO nanorods on arbitrary substrates with a patterned seed layer via ultraviolet-assisted nanoimprint lithography

Cited by 25 publications

References 41 publications

Optimization of Transistor Characteristics and Charge Transport in Solution Processed ZnO Thin Films Grown from Zinc Neodecanoate

Optimization of Transistor Characteristics and Charge Transport in Solution Processed ZnO Thin Films Grown from Zinc Neodecanoate

Metal Catalyst for Low-Temperature Growth of Controlled Zinc Oxide Nanowires on Arbitrary Substrates

Fabrication of Periodic Nanostructure Assemblies by Interfacial Energy Driven Colloidal Lithography

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