Synthesis Of Zno Nanowire By Mocvd Technique Effect Of Substrate And Growth Parameter

Download Synthesis Of Zno Nanowire By Mocvd Technique Effect Of Substrate And Growth Parameter full books in PDF, epub, and Kindle. Read online Synthesis Of Zno Nanowire By Mocvd Technique Effect Of Substrate And Growth Parameter ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!

Nanowires

Author : Xihong Peng
Publisher : IntechOpen
ISBN 13 : 9789535108986
Total Pages : 436 pages
Book Rating : 4.1/5 (89 download)

DOWNLOAD NOW!

Book Synopsis Nanowires by : Xihong Peng

Download or read book Nanowires written by Xihong Peng and published by IntechOpen. This book was released on 2012-12-19 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: One dimensional nanoscale structures such as nanowires have drawn extensive research interests in recent years. The size miniature brings unique properties to nanowires due to quantum confinement. The large surface-to-volume ratio renders nanowires with high sensitivity to surface effects. The unique geometrical advantages and properties facilitate the utilization of nanowires in nano-electronics. InTech scientific publisher has initialized a series of books focusing on fundamental research in nanowires, which largely boosted the widespread of knowledge among the research society. This book is intended to provide an updated review on the applications of various nanowires and the associated advancements in synthesis and properties characterization. The topics include recent progress in metal oxide nanowires, silicon nanowires, carbon based nanotubes and nanowires.

Synthesis of ZnO Nanowire by MOCVD Technique: Effect of Substrate and Growth Parameter

Author : Sachindra Nath Das
Publisher :
ISBN 13 : 9789535108986
Total Pages : pages
Book Rating : 4.1/5 (89 download)

DOWNLOAD NOW!

Book Synopsis Synthesis of ZnO Nanowire by MOCVD Technique: Effect of Substrate and Growth Parameter by : Sachindra Nath Das

Download or read book Synthesis of ZnO Nanowire by MOCVD Technique: Effect of Substrate and Growth Parameter written by Sachindra Nath Das and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Nanowires

Author : Xihong Peng
Publisher : BoD – Books on Demand
ISBN 13 : 9535108980
Total Pages : 438 pages
Book Rating : 4.5/5 (351 download)

DOWNLOAD NOW!

Book Synopsis Nanowires by : Xihong Peng

Download or read book Nanowires written by Xihong Peng and published by BoD – Books on Demand. This book was released on 2012-12-19 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: One dimensional nanoscale structures such as nanowires have drawn extensive research interests in recent years. The size miniature brings unique properties to nanowires due to quantum confinement. The large surface-to-volume ratio renders nanowires with high sensitivity to surface effects. The unique geometrical advantages and properties facilitate the utilization of nanowires in nano-electronics. InTech scientific publisher has initialized a series of books focusing on fundamental research in nanowires, which largely boosted the widespread of knowledge among the research society. This book is intended to provide an updated review on the applications of various nanowires and the associated advancements in synthesis and properties characterization. The topics include recent progress in metal oxide nanowires, silicon nanowires, carbon based nanotubes and nanowires.

1-Dimensional Metal Oxide Nanostructures

Author : Zainovia Lockman
Publisher : CRC Press
ISBN 13 : 1351266705
Total Pages : 306 pages
Book Rating : 4.3/5 (512 download)

DOWNLOAD NOW!

Book Synopsis 1-Dimensional Metal Oxide Nanostructures by : Zainovia Lockman

Download or read book 1-Dimensional Metal Oxide Nanostructures written by Zainovia Lockman and published by CRC Press. This book was released on 2018-12-07 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1-D metal oxide nanostructures, especially those with semiconducting properties, have attracted much attention in recent years due to their potential and emerging applications, specifically in environment purification and energy devices. For these applications, there have been many efforts to grow 1-D nanostructures in the form of nanotubes, nanorods, and nanowires using processes that conserve energy, are cost effective, and can be scaled up for large-scale production. 1-Dimensional Metal Oxide Nanostructures gathers under one title the most recent development of oxide nanomaterials, especially those fabricated via oxidation process in the nanoscale field. Thermal and anodic oxidation processes are reviewed with an aim to offer an in-depth understanding of mechanisms of 1-D nanostructure formation, their characteristics, and limitations. Other more common methods are also discussed, including sol-gel, hydrothermal, and other templated methods. Important applications of 1-D nanostructures are then presented, focusing on oxides like zinc oxide, titanium oxide, zirconium oxide, copper oxide, and iron oxide. A chapter on carbon nanotubes hybrid with these oxides is also included as well as one on silicon oxide nanowires formation by local anodic oxidation process. Aimed at researchers, academics, and engineers working across the fields of nanotechnology, materials science, chemistry, physics, semiconductors, and environmental and biomedical engineering, this essential reference enables readers to grasp the main concepts of nanomaterials in 1-D: formation technique, characteristics, and uses. It also encourages practical innovations in nanotechnology, especially in curbing pressing global issues related to energy, environment, and security.

Metalorganic Vapor Phase Epitaxy (MOVPE)

Author : Stuart Irvine
Publisher : John Wiley & Sons
ISBN 13 : 1119313015
Total Pages : 582 pages
Book Rating : 4.1/5 (193 download)

DOWNLOAD NOW!

Book Synopsis Metalorganic Vapor Phase Epitaxy (MOVPE) by : Stuart Irvine

Download or read book Metalorganic Vapor Phase Epitaxy (MOVPE) written by Stuart Irvine and published by John Wiley & Sons. This book was released on 2019-10-07 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Systematically discusses the growth method, material properties, and applications for key semiconductor materials MOVPE is a chemical vapor deposition technique that produces single or polycrystalline thin films. As one of the key epitaxial growth technologies, it produces layers that form the basis of many optoelectronic components including mobile phone components (GaAs), semiconductor lasers and LEDs (III-Vs, nitrides), optical communications (oxides), infrared detectors, photovoltaics (II-IV materials), etc. Featuring contributions by an international group of academics and industrialists, this book looks at the fundamentals of MOVPE and the key areas of equipment/safety, precursor chemicals, and growth monitoring. It covers the most important materials from III-V and II-VI compounds to quantum dots and nanowires, including sulfides and selenides and oxides/ceramics. Sections in every chapter of Metalorganic Vapor Phase Epitaxy (MOVPE): Growth, Materials Properties and Applications cover the growth of the particular materials system, the properties of the resultant material, and its applications. The book offers information on arsenides, phosphides, and antimonides; nitrides; lattice-mismatched growth; CdTe, MCT (mercury cadmium telluride); ZnO and related materials; equipment and safety; and more. It also offers a chapter that looks at the future of the technique. Covers, in order, the growth method, material properties, and applications for each material Includes chapters on the fundamentals of MOVPE and the key areas of equipment/safety, precursor chemicals, and growth monitoring Looks at important materials such as III-V and II-VI compounds, quantum dots, and nanowires Provides topical and wide-ranging coverage from well-known authors in the field Part of the Materials for Electronic and Optoelectronic Applications series Metalorganic Vapor Phase Epitaxy (MOVPE): Growth, Materials Properties and Applications is an excellent book for graduate students, researchers in academia and industry, as well as specialist courses at undergraduate/postgraduate level in the area of epitaxial growth (MOVPE/ MOCVD/ MBE).

Epitaxial Zinc Oxide Thin Films and Nanowires

Author : Maximilian Kolhep
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

DOWNLOAD NOW!

Book Synopsis Epitaxial Zinc Oxide Thin Films and Nanowires by : Maximilian Kolhep

Download or read book Epitaxial Zinc Oxide Thin Films and Nanowires written by Maximilian Kolhep and published by . This book was released on 2023* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Zinc Oxide Bulk, Thin Films and Nanostructures: Processing, Properties, and Applications

Author : Chennupati Jagadish
Publisher : Elsevier Science
ISBN 13 : 9781483299679
Total Pages : 600 pages
Book Rating : 4.2/5 (996 download)

DOWNLOAD NOW!

Book Synopsis Zinc Oxide Bulk, Thin Films and Nanostructures: Processing, Properties, and Applications by : Chennupati Jagadish

Download or read book Zinc Oxide Bulk, Thin Films and Nanostructures: Processing, Properties, and Applications written by Chennupati Jagadish and published by Elsevier Science. This book was released on 2006-09 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: With an in-depth exploration of the following topics, this book covers the broad uses of zinc oxide within the fields of materials science and engineering: - Recent advances in bulk, thin film and nanowire growth of ZnO (including MBE, MOCVD and PLD), - The characterization of the resulting material (including the related ternary systems ZgMgO and ZnCdO), - Improvements in device processing modules (including ion implantation for doping and isolation, Ohmic and Schottky contacts, wet and dry etching), - The role of impurities and defects on materials properties - Applications of ZnO in UV light emitters/detectors, gas, biological and chemical-sensing, transparent electronics, spintronics and thin film

Synthesis, Integration and Application of ZnO Nanowires

Author : Lei Luo
Publisher :
ISBN 13 :
Total Pages : 322 pages
Book Rating : 4.:/5 (35 download)

DOWNLOAD NOW!

Book Synopsis Synthesis, Integration and Application of ZnO Nanowires by : Lei Luo

Download or read book Synthesis, Integration and Application of ZnO Nanowires written by Lei Luo and published by . This book was released on 2007 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fundamental Understanding of the Growth, Doping and Characterization of Aligned ZNO Nanowires

Author : Gang Shen
Publisher :
ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.:/5 (895 download)

DOWNLOAD NOW!

Book Synopsis Fundamental Understanding of the Growth, Doping and Characterization of Aligned ZNO Nanowires by : Gang Shen

Download or read book Fundamental Understanding of the Growth, Doping and Characterization of Aligned ZNO Nanowires written by Gang Shen and published by . This book was released on 2014 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) is a II-VI semiconductor whose wide direct bandgap (3.37 eV) and large exciton binding energy (60 meV) make it compelling for optoelectronic devices such as light emitting diodes, lasers, photodetectors, solar cells, and mechanical energy harvesting devices. One dimensional structures of ZnO (nanowires) have become significant due to their unique physical properties arising from quantum confinement, and they are ideal for studying transport mechanisms in one-dimensional systems. In this doctoral research work, ZnO nanowire (NW) arrays were synthesized on sapphire substrates through carbo-thermal reduction of ZnO powders, and the effects of growth parameters on the properties of ZnO NW arrays were studied by scanning and transmission electron microscopy, X-ray diffraction, photoluminescence and Raman spectroscopy. Based on the phonon mode selection rules in wurtzite ZnO, confocal Raman spectroscopy was used to assess the alignment of ZnO NWs in an array, thereby complementing X-ray diffraction. Al doped ZnO NW arrays were achieved by mixing Al powder into the ZnO and graphite source mixture, and the presence of Al was confirmed by Energy-dispersive X-ray spectroscopy. The incorporation of Al had the effects of lowering the electrical resistivity, slightly deteriorating crystal quality and suppressing defect related green emission. Two models of ZnO NW growth were developed by establishing the relationship between NW length and diameter for undoped and Al doped ZnO NWs separately. The growth of undoped ZnO NWs followed the diffusion-induced model which was characterized by thin wires being longer than thick wires, while the growth of Al doped ZnO was controlled by Gibbs-Thomson effect which was characterized by thin wires being shorter than thin wires. Local electrode atom probe analysis of ZnO NWs was carried out to study the crystal stoichiometry and Al incorporation. Undoped ZnO NWs were found to be high purity with no detectable impurities. Possible Al incorporation related peaks were observed in the mass spectrum of Al doped ZnO NWs. Further work on Al doped ZnO LEAP analysis is needed to better understand the Al dopant.

Renewable and Sustainable Composites

Author : António Pereira
Publisher : BoD – Books on Demand
ISBN 13 : 1789842158
Total Pages : 154 pages
Book Rating : 4.7/5 (898 download)

DOWNLOAD NOW!

Book Synopsis Renewable and Sustainable Composites by : António Pereira

Download or read book Renewable and Sustainable Composites written by António Pereira and published by BoD – Books on Demand. This book was released on 2019-12-04 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composites are used in a wide range of applications, from electronics to the aeronautical industry. The excellent mechanical properties and low-specific weight of composites are the basis of many structural applications. Despite the progress achieved, there are significant obstacles to the generalisation of structural applications of composites, mainly due to their high cost and complex mechanical behaviour. In fact, there is currently insufficient knowledge regarding the mechanical properties and failure mechanisms of composites made from renewable and sustainable materials. This book focuses on composites from natural and renewable resources, including the enhancement of their properties with additives such as biodegradable nanomaterials, their mechanical characterisation, tailoring of properties for specific applications and their processing.

ZnO Nanostructure Synthesis & Laser Direct Writing Process for Optoelectronic Devices

Author : DAEHO LEE
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (957 download)

DOWNLOAD NOW!

Book Synopsis ZnO Nanostructure Synthesis & Laser Direct Writing Process for Optoelectronic Devices by : DAEHO LEE

Download or read book ZnO Nanostructure Synthesis & Laser Direct Writing Process for Optoelectronic Devices written by DAEHO LEE and published by . This book was released on 2012 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) has a long history of usage in electronics. Recently, ZnO has been gathering great interest of researchers in nanoscience due to its diverse and versatile morphologies such as nanoparticles (NP), nanowires (NW), nanorods, nanotubes, nanohelixes, etc. This dissertation deals with studies covering from the synthesis of ZnO nanostructures to deposition & patterning methods and their applications for optoelectronic devices such as transparent electrodes, active layers for thin film transistor and photovoltaics. A very well-dispersed, transparent and concentration-tunable ZnO NP solution was successfully synthesized with a new process. Highly transparent ZnO thin films were fabricated by spin coating and subsequent ultra short-pulsed UV laser annealing was performed to change the film properties. While as-deposited NP thin films were not electrically conductive, laser annealing imparted a substantial conductivity increase. Thus, selective annealing for conductive patterns directly on the NP thin film without a photolithographic process was achieved. The conductivity is by a factor of 105 higher than that of the previously reported furnace-annealed ZnO NP films and even comparable to that of vacuum-deposited, impurity-doped ZnO films within a factor of 10. The ZnO film obtained from the process developed in this work has been applied to the fabrication of a thin film transistor (TFT) showing enhanced performance compared with the TFT fabricated on furnace annealed ZnO film. The ZnO TFT performance test reveals that by just changing the laser annealing parameters the solution-deposited ZnO thin film properties can be tuned suitable for both transparent conductors and semiconductor active layers. Two kinds of nanomaterial patterning methods via direct writing have been demonstrated. First, laser-assisted nanoimprinting of metal and semiconductor nanoparticles has been presented as a large area one step patterning method. With the method, submicron structures including mesh, line, nanopillar and nanowire arrays were fabricated on various kinds of wafer scale substrates. Using the rapid laser-based nanolithography, the prohibitive constraints of e-beam patterning could be overcome. Therefore, this method opens a way to the fabrication of electronic and energy devices with high throughput and ultra low-cost. Second, a drop on demand (DOD) inkjet printing of ZnO seed layers integrated with a CAD (computer aided design) system for a fully digital selective ZnO NW array growth has been discussed. Through proper natural convection suppression during the hydrothermal growth, successful ZnO nanowire local growth could be achieved. Without any need for the photolithographic process or stamp preparation, the NW growth location can be easily modified with high degree of freedom. These two methods are compatible with flexible plastic substrates. As an application of ZnO nanostructures for high efficiency solar cells, ZnO dye-sensitized solar cells (DSSCs) with greatly enhanced surface area for higher dye loading and light harvesting were demonstrated. The selective growth of "nanoforests" composed of high density, long branched tree-like multi generation hierarchical ZnO nanowire photoanodes by utilizing seed particles and a capping polymer increased the energy conversion efficiency significantly. The overall light-conversion efficiency of the branched ZnO nanowire DSSCs was almost 5 times higher than the efficiency of DSSCs constructed by upstanding ZnO nanowires. A parametric study to determine the optimum hierarchical ZnO nanowire photoanode was performed through the combination of both length-wise and branched growth processes.

Nanoengineering of ZnO Electrical and Optical Characteristics by Controlling Its Morphology and Defects Via Reaction Kinetics, Fluid Dynamics, and Stoichiometry in Low-pressure CVD Synthesis

Download Nanoengineering of ZnO Electrical and Optical Characteristics by Controlling Its Morphology and Defects Via Reaction Kinetics, Fluid Dynamics, and Stoichiometry in Low-pressure CVD Synthesis PDF Online Free

Author : Taehoon Lim
Publisher :
ISBN 13 : 9781369656350
Total Pages : 119 pages
Book Rating : 4.6/5 (563 download)

DOWNLOAD NOW!

Book Synopsis Nanoengineering of ZnO Electrical and Optical Characteristics by Controlling Its Morphology and Defects Via Reaction Kinetics, Fluid Dynamics, and Stoichiometry in Low-pressure CVD Synthesis by : Taehoon Lim

Download or read book Nanoengineering of ZnO Electrical and Optical Characteristics by Controlling Its Morphology and Defects Via Reaction Kinetics, Fluid Dynamics, and Stoichiometry in Low-pressure CVD Synthesis written by Taehoon Lim and published by . This book was released on 2016 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: LPCVD synthesis and characterization of ZnO with diverse morphology for semiconducting applications are studied and discussed in this dissertation. Because nanoscale ZnO shows variant characteristics depending on its physical dimensions, morphology, and impurity concentration, the focus of this work is to control the structure and composition of ZnO by adjusting synthesis parameters and methods. In Chapter 2, the synthesis of ZnO with optimized concentration of oxygen vacancies and physical dimensions are discussed. Opaqueness of ZnO is derived from scattering due to its physical dimensions, but visible transparency for the photocatalytic application of ZnO for solar cell devices is required. By controlling the concentration of oxygen vacancies and physical dimensions, fluorescent and transparent ZnO is successfully synthesized. In Chapter 3, a method to stabilize precursor supply and to lower the reaction temperature is discussed. In CVD synthesis, the stable and continuous growth of ZnO is inhibited by the premature oxidation of Zn, and the formation of a zinc oxide layer that blocks the evaporation of Zn precursor. By controlling the fluid dynamics of precursor vapors, a low temperature synthesis method with higher product uniformity is developed. Using this method, a stable synthesis technique for producing high quality ZnO under low temperature is successfully achieved. In Chapter 4, the synthesis of ZnO under relatively low temperature is discussed. During LPCVD synthesis it is observed that as the distance from the source increases, the partial vapor pressure of Zn near the surface of the deposition substrate is drastically decreased (along the axis of gas flow), forming a dimensional gradient on a single substrate. The changing reactant ratio near the surface drives the non-uniformity of product in terms of morphology, physical dimensions, and impurity concentration. In Chapter 5, a novel template-free self-catalyzed synthesis technique for achieving ultra-thin ZnO nanowires is discussed. From the tip of synthesized hexagonal cone ZnO, ultra-thin ZnO nanowires are grown by self-catalysis.

Growth, Doping, and Characterization of ZnO Nanowires

Author : Svetlana Spitsina
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)

DOWNLOAD NOW!

Book Synopsis Growth, Doping, and Characterization of ZnO Nanowires by : Svetlana Spitsina

Download or read book Growth, Doping, and Characterization of ZnO Nanowires written by Svetlana Spitsina and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Controlled Synthesis of ZnO Nanowires Towards the Fabrication of Solar Cells

Author : Dongshan Yu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (475 download)

DOWNLOAD NOW!

Book Synopsis Controlled Synthesis of ZnO Nanowires Towards the Fabrication of Solar Cells by : Dongshan Yu

Download or read book Controlled Synthesis of ZnO Nanowires Towards the Fabrication of Solar Cells written by Dongshan Yu and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, quasi-one-dimensional materials have attracted a lot of research attention due to their remarkable properties, and their potential as building blocks for nanoscale electronic and optoelectronic devices. A modified chemical vapor deposition (CVD) method has been used to synthesize ZnO nanowires. Electron microscopy and other characterization techniques show that nanowires having distinct morphologies when grown under different conditions. The effects of reaction parameters including reaction time, temperature, carrier gas flow rate, substrates and catalyst material upon the size, shape, and density of ZnO nanowire arrays have been investigated. Excitonic solar cells -including Gratzel-type cells, organic and hybrid organic/inorganic solar cells- are promising devices for inexpensive, large-scale solar energy conversion. Hybrid organic/inorganic solar cells are made from composites of conjugated polymers with nanostructure metal oxides, in which the polymer component serves the function of both light absorber and hole conductor, and the ZnO nanowire arrays act as the electron conductors. Organic solar cells have been fabricated from environmentally friendly water-soluble polymers and ZnO nanowire arrays.

Sonochemical Synthesis and Growth Kinetics of Zinc Oxide Nanowires and Zinc Oxide Nanowalls for Sensor Applications

Author : Avinash Pradeep Nayak
Publisher :
ISBN 13 : 9781267025241
Total Pages : pages
Book Rating : 4.0/5 (252 download)

DOWNLOAD NOW!

Book Synopsis Sonochemical Synthesis and Growth Kinetics of Zinc Oxide Nanowires and Zinc Oxide Nanowalls for Sensor Applications by : Avinash Pradeep Nayak

Download or read book Sonochemical Synthesis and Growth Kinetics of Zinc Oxide Nanowires and Zinc Oxide Nanowalls for Sensor Applications written by Avinash Pradeep Nayak and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Sonochemical growth of zinc oxide (ZnO) nanowires and nanowalls is a relatively new synthetic technique that allows for room ambient growth and large scale production. This synthesis technique allows for services ranging from gas sensors and UV switches. In comparison to the widely used hydrothermal method of growth at low-temperatures, the sonochemical technique is found to be advantageous from the environmental impact, scalability, process time and production cost viewpoints. Using the sonochemical method, ZnO thin films, nanowires, and nanowalls, were synthesized. Although many applications can result from these nano-materials, we focus on ultraviolet (UV) photo-detectors and gas sensors. This method promises a mass-manufacturable process for fast and inexpensive ZnO nanowire production for practical low cost electronics, photonics and energy conversion applications.

Zinc Oxide

Author : Hadis Morkoç
Publisher : John Wiley & Sons
ISBN 13 : 3527623957
Total Pages : 488 pages
Book Rating : 4.5/5 (276 download)

DOWNLOAD NOW!

Book Synopsis Zinc Oxide by : Hadis Morkoç

Download or read book Zinc Oxide written by Hadis Morkoç and published by John Wiley & Sons. This book was released on 2008-12-03 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first systematic, authoritative and thorough treatment in one comprehensive volume presents the fundamentals and technologies of the topic, elucidating all aspects of ZnO materials and devices. Following an introduction, the authors look at the general properties of ZnO, as well as its growth, optical processes, doping and ZnO-based dilute magnetic semiconductors. Concluding sections treat bandgap engineering, processing and ZnO nanostructures and nanodevices. Of interest to device engineers, physicists, and semiconductor and solid state scientists in general.

Hydrothermal Synthesis of Zinc Oxide Nanowire Arrays for Photovoltaic Applications

Author : Jian Wei Jayce Cheng
Publisher :
ISBN 13 :
Total Pages : 171 pages
Book Rating : 4.:/5 (98 download)

DOWNLOAD NOW!

Book Synopsis Hydrothermal Synthesis of Zinc Oxide Nanowire Arrays for Photovoltaic Applications by : Jian Wei Jayce Cheng

Download or read book Hydrothermal Synthesis of Zinc Oxide Nanowire Arrays for Photovoltaic Applications written by Jian Wei Jayce Cheng and published by . This book was released on 2016 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) nanowires with excellent crystal quality can be grown vertically aligned from a substrate using hydrothermal synthesis, a low-cost, scalable process that is compatible with many semiconductor processing techniques. However, precise control over nanowire array dimensions such as nanowire spacing, diameter, length, and alignment, which is important for optoelectronic device applications, has proven elusive due to lack of understanding regarding fundamental aqueous growth mechanisms at the nanoscale. Here, we utilize electron-beam lithography to template ZnO seed layers, demonstrating that seed layer engineering via judicious choice of seed deposition conditions and annealing can yield well-aligned nanowire arrays with single nanowire spatial precision on a variety of device relevant substrates. Subsequently, we use bottom-up patterning techniques and investigate the competition between diffusive transport and surface reaction in hydrothermal growth to achieve control over nanowire spacing and enhanced nanowire array uniformity over length scales suitable for photovoltaic (PV) device fabrication. By analyzing the role of temperature, concentration, and areal seed density on the balance between diffusion vs. reaction rates at the solution-nanowire interface, we show that the c-facet grows via the direct incorporation mechanism. With this knowledge, we use additives to shift the nanowire growth system into a reaction-limited regime, making nanowire growth rate independent of the patterned template. As a consequence, we achieve ZnO nanowire array uniformity that is critical for device applications.