Metalorganic vapor-phase epitaxial growth of vertically well-aligned ZnO nanorods

Park, Won Il; Kim, D. H.; Jung, Sungmoon; Yi, Gyu‐Chul

doi:10.1063/1.1482800

Cited by 1,145 publications

(735 citation statements)

References 18 publications

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“…Due to the high surface-to-volume ratio provided by the one-dimensional (1D) nanostructure, ZnO nanorod arrays are considered suitable to the application for hybrid photovoltaic devices [4][5][6][7]. In the past few years, ZnO nanorods have been synthesized via various physical and chemical methods including vapor phase synthesis [8][9][10], metalorganic chemical vapor deposition (MOCVD) [11][12][13], and solution-based synthesis [14][15][16][17]. Among these routes, solution-based method has the advantages of simplicity, low costs, low growth temperature, and easy coating of large surfaces Intensive research has been focused on the solution growth process of ZnO nanorods on ITO-coated glass substrates.…”

Section: Introductionmentioning

confidence: 99%

Growth of ZnO Nanorod Arrays on Flexible Substrates: Effect of Precursor Solution Concentration

et al. 2012

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We report a low-temperature aqueous solution growth of uniformly aligned ZnO nanorod arrays on flexible substrates. The substrate is Indium Tin Oxide (ITO) film coated on polyethylene terephthalate (PET). Solutions with five different concentrations of the precursors with equimolar Zinc Nitrate and Hexamethylenetetramine (HMT) in distilled water were prepared to systematically study the effect of precursor solution concentration on the structural and optical properties of ZnO nanorods. It was concluded that the precursor concentration have great influence on the morphology, crystal quality, and optical property of ZnO nanorods. The diameter, density, and orientation of the nanorods are dependent on the precursor solution concentration. X-ray diffraction and micro-Raman spectroscopy showed that the ZnO nanorods with the highest concentration of 50 mM were highly aligned and have the highest level of surface coverage. It was also found that the diameter and length of the nanorods increases upon increasing precursor solution concentration. This is the first systematic investigation of studying the effect of precursor solution concentration on the quality of ZnO nanorods grown on ITO/PET substrates by low-temperature solution method. We believe that our work will contribute to the realization of flexible organic-inorganic hybrid solar cell based on ZnO nanorods and conjugated polymer.

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Section: Introductionmentioning

confidence: 99%

Growth of ZnO Nanorod Arrays on Flexible Substrates: Effect of Precursor Solution Concentration

et al. 2012

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“…Among various 1D nanostructural materials, Zinc oxide (ZnO) has generated great interests due to its direct wide band gap of 3.37eV at room temperature, large exciton binding energy of 60meV, and stable physical and chemical properties. Until now, different fabrication methods, such as vapor-phase transport [7][8][9], pulsed laser deposition [10], chemical vapor deposition [11,12] and electrochemical deposition [13], have been widely reported for the preparation of 1-D ZnO nanorods. According to these methods, the complex processes, sophisticated equipment and high temperatures are usually required.…”

Section: Introductionmentioning

confidence: 99%

Effective way to control the size of well-aligned ZnO nanorod arrays with two-step chemical bath deposition

Yang

Zhao

Willander

et al. 2009

Journal of Crystal Growth

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The diameter of well-aligned ZnO nanorod arrays (ZNAs) grown on Si substrates has been well controlled from 150nm to 40nm by two-step chemical bath deposition method (CBD), i.e. substrate pretreatment with spin coating to form ZnO nanoparticles seed layer and CBD growth. The effects of ZnO nanoparticles density and diameter on size and alignment of ZNAs were investigated in detail by atomic force microscope (AFM), X-ray diffraction (XRD), scan electronic microscope (SEM), transmission electron microscope (TEM) and photoluminescence (PL). The results indicate that both diameter and density of ZnO nanoparticles which were pre-coated on the substrates will influence the size and alignment of ZNAs, but the density will play a key role to determine the diameter of ZNAs when the density is higher than the value of 2.3×10 8 cm -2 . Moreover, only a strong UV peak at 385 nm appears in room temperature PL spectrum for these samples, which indicates that as-synthesized ZnO nanorods have a perfect crystallization and low density of deep level defects.

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“…The synthesis of 1D single-crystalline ZnO nanostructures has been of growing interest owing to their promising application in nanoscale optoelectronic devices. Single-crystalline ZnO nanowires have been synthesized successfully in several groups [16][17][18][19][20]. Wang et al reported the synthesis of oxide nanobelts by simply evaporating the commercial metal oxide powders at high temperatures [3,[19][20].…”

mentioning

confidence: 99%

The octa-twin tetraleg ZnO nanostructures

Dai

Zhang

Wang

2003

Solid State Communications

171

113

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We have developed a simple solid-vapor approach for controlled growth of the tetraleg ZnO nanostructure at high yield. The length of the tetraleg is 2 -3 mm and the edge size of its centering nucleus is 70 -200 nm. Our electron microscopy study gives the first direct evidence about the existence of the octahedral multiple twin nucleus, which is confirmed to be responsible for the formation of the tetraleg ZnO nanostructure. The tetraleg ZnO nanostructure is likely to be a candidate as building blocks for contructing photonic crystals. Nanoscale materials exhibit a wide range of electrical and optical properties that depend sensitively on both shape and size, and are of both fundamental and technological interest. One-dimensional (1D) nanostructures, such as nanotubes, nanowires and nanobelts, have attracted extraordinary attention for their potential applications in device and interconnect integration in nanoelectronics and molecular electronics [1 -5]. Although different levels of growth controls for nanowires (including positional, orientational, diameter, and density control) have been achieved [6], the shape control of nanostructures is not easily obtained. The synthesis of complex structures of rod-based CdSe nanocrystals e.g. arrow and teardrop, has demonstrated some success in this direction [7 -9]. Since the novel properties of nanomaterials depend sensitively on their shape and size, the development of synthetic methods and an understanding of the mechanism by which the shape and size of nanostructures can be easily controlled is a key issue in nanoscience.ZnO exhibits a direct bandgap of 3.37 eV at room temperature with a large exciton binding energy of 60 meV. The strong exciton binding energy, which is much larger than that of GaN (25 meV) and the thermal energy at room temperature (26 meV), can ensure an efficient exciton emission at room temperature under low excitation energy [10 -11]. As a consequence, ZnO is recognized as a promising photonic material in the blue-UV region. Room temperature UV lasing properties have recently been demonstrated from ZnO epitaxial films, microcrystalline thin films, and nanoclusters [12][13][14][15]. The synthesis of 1D single-crystalline ZnO nanostructures has been of growing interest owing to their promising application in nanoscale optoelectronic devices. Single-crystalline ZnO nanowires have been synthesized successfully in several groups [16][17][18][19][20]. Wang et al. reported the synthesis of oxide nanobelts by simply evaporating the commercial metal oxide powders at high temperatures [3,[19][20]. The assynthesized oxide nanobelts are pure, structurally uniform, and single crystalline, and most of them are of free from 0038-1098/03/$ -see front matter q

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Metalorganic vapor-phase epitaxial growth of vertically well-aligned ZnO nanorods

Cited by 1,145 publications

References 18 publications

Growth of ZnO Nanorod Arrays on Flexible Substrates: Effect of Precursor Solution Concentration

Growth of ZnO Nanorod Arrays on Flexible Substrates: Effect of Precursor Solution Concentration

Effective way to control the size of well-aligned ZnO nanorod arrays with two-step chemical bath deposition

The octa-twin tetraleg ZnO nanostructures

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