ZnO Nanowires for Dye Sensitized Solar Cells PDF Download
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Author: Simas Rackauskas
Publisher:
ISBN:
Category : Science
Languages : en
Pages :
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Book Description
This chapter provides a broad review of the latest research activities focused on the synthesis and application of ZnO nanowires (NWs) for dye-sensitized solar cells (DSCs) and composed of three main sections. The first section briefly introduces DSC-working principles and ZnO NW application advantages and stability issues. The next section reviews ZnO NW synthesis methods, demonstrating approaches for controlled synthesis of different ZnO NW morphology and discussing how this effects the overall efficiency of the DSC. In the last section, the methods for ZnO NW interface modification with various materials are discussed, which include ZnO core-shell structures with semiconductive or protective layers, ZnO NW hybrid structures with other materials, such as nanoparticles, quantum dots and carbon nanomaterials and their benefit for charge and light transport in DSCs. The review is concluded with some perspectives and outlook on the future developments in the ZnO nanowire application for DSCs.
Author: Simas Rackauskas
Publisher:
ISBN:
Category : Science
Languages : en
Pages :
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Book Description
This chapter provides a broad review of the latest research activities focused on the synthesis and application of ZnO nanowires (NWs) for dye-sensitized solar cells (DSCs) and composed of three main sections. The first section briefly introduces DSC-working principles and ZnO NW application advantages and stability issues. The next section reviews ZnO NW synthesis methods, demonstrating approaches for controlled synthesis of different ZnO NW morphology and discussing how this effects the overall efficiency of the DSC. In the last section, the methods for ZnO NW interface modification with various materials are discussed, which include ZnO core-shell structures with semiconductive or protective layers, ZnO NW hybrid structures with other materials, such as nanoparticles, quantum dots and carbon nanomaterials and their benefit for charge and light transport in DSCs. The review is concluded with some perspectives and outlook on the future developments in the ZnO nanowire application for DSCs.
Author: Mallarie DeShea McCune
Publisher:
ISBN:
Category : Nanostructures
Languages : en
Pages :
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Book Description
Because of its excellent and unique physical properties, ZnO nanowires have been widely used in numerous scientific fields such as sensors, solar cells, nanogenerators, etc. Although it is believed that single crystal ZnO has a much higher electron transfer rate than TiO2, it was found that ZnO nanowire-based dye-sensitized solar cells (DSSCs) have lower efficiencies than TiO2 nanoparticle-based DSSCs because the density and surface area of ZnO nanowires are usually lower than that of TiO2 nanoparticles, limiting the cell's light absorption, and because the open-root structure of ZnO nanowires results in electron back transfer that causes charge shortage of the cell. Here, experimental studies were performed that utilize strategic manipulations of the design of the ZnO nanowire based DSSCs in efforts to address and solve its key challenges. It was shown that by incorporating various blocking layers into the design of the cell, the performance of the DSSC can be improved. Specifically, by placing a hybrid blocking layer of TiO2-P4VP polymer between the substrate and the ZnO nanowires, the conversion efficiency of the cell was 43 times higher than that of a cell without this blocking layer due to the reduction of electron back transfer. Furthermore, in efforts to improve the surface area of the ZnO nanowire array, unique three dimensional structures of ZnO nanowires were fabricated. It was found that by significantly improving the overall density and surface area of the ZnO nanowire array through distinctive hierarchal nanowire structures, the light harvesting efficiency and electron transport were enhanced allowing the DSSC to reach 5.20%, the highest reported value for 3D ZnO NW based DSSCs. Additionally, the development of a theoretical model was explored in efforts to investigate how the geometry of ZnO nanowires affects the incident photon-to-current conversion efficiency of 1D ZnO nanowire-based N719-sensitized solar cells at the maximum absorption wavelength of 543 nm.
Author: Hsin-Ming Cheng
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
Zinc oxide nanostructure has a wide bandgap energy of 3.37 eV and a large exciton binding energy of 60 meV at room temperature. It is certainly a promising material for photonic devices in the ultraviolet to blue wavelength range. ZnO-related materials are also expected to construct the exciton as well as polariton lasers owing to their excitonic-stimulated emission and laser behavior under optically pumping can be obtained at ambient temperature. Because of the optical losses, including not only nonradiative recombination centers but also traps of excitons, the high quality of ZnO becomes even more imperative in the excitonic lasing processes. In the present chapter, ZnO nanowire structures via a low-pressure vapor-phase deposition and a simple solvothermal method will be presented. The one-dimensional ZnO nanowires could afford a direct conduction pathway to significantly enhance the overall efficiency of the dye-sensitized solar cells. Furthermore, this content will demonstrate how to employ the hierarchical structure of the ZnO nanoparticles, fabricated from sol-gel method, which could promote light scattering, thus, enhancing photon absorption and the overall solar conversion efficiency. The aim of this chapter is to present the correlation between the fundamental properties of ZnO nanostructures and their photovoltaics performances.
Author: Khan Maaz
Publisher: BoD – Books on Demand
ISBN: 9535132830
Category : Science
Languages : en
Pages : 266
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Book Description
One-dimensional nanostructures, such as nanowires, have drawn extensive research interests in the recent years. The smaller size brings unique properties to the nanowires due to the finite size effect (quantum confinement effects). The unique geometrical features of the nanowires bring their utilization in many practical applications in the recent advanced technology. This book provides an updated review on fabrication, properties, and applications of various nanowires. This book is aimed to provide solid foundation of nanowires to the students, scientists, and engineers working in the field of material science and condensed matter physics.
Author: Sadia Ameen
Publisher:
ISBN: 9781789239942
Category : Nanostructured materials
Languages : en
Pages :
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Book Description
Author: Mikhail Ladanov
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The newly developed approach greatly facilitates growth of ZnO nanowires in confined microstructures, which greatly enhances the possibilities for the usage of ZnO nanowires in applications where they act as a porous electrode. These novel techniques open wide possibilities for improving performance of devices such as dye sensitized solar cells or supercapacitors.
Author: Gaurav Sharma
Publisher: Materials Research Forum LLC
ISBN: 1644902397
Category : Technology & Engineering
Languages : en
Pages : 333
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Book Description
ZnO and its hybrid nanostructures have unique optical, physical and chemical properties. The book covers recent trends in processing techniques and applications. Topics include solar cells, photo-voltaic devices, fuel cells, uv filters, lasers, light-emitting diodes, photo-detectors, spin-tronic devices, magnetic semiconductors, nano-generators, piezotronics, photo-catalytic applications against harmful organic pollutants like dyes, heavy metals, antibiotics, and sensors such as bio sensors, chemical sensors, gas sensors. Keywords: ZnO, Nano ZnO, Point Defects, Magnetic Semiconductors, Hybrid Nanostructures, Cell Applications, Nanoadsorbant for Heavy Metal Removals, Diagnostics, ZnO Nano-Carriers, ZnO Thin Films Fabrication.
Author: Felix Ryler
Publisher:
ISBN: 9781681176680
Category :
Languages : en
Pages : 284
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Book Description
The properties of nanowires have caused researchers and companies to consider using this material in several fields. Nanowires are nanostructures that have a thickness or diameter constrained to tens of nanometers or less and an unconstrained length. In addition, many different types of nanowires exist, including metallic, semiconducting and insulating. Nanowires hold lot of promises for different applications. Basic electronic devices like junction diodes, transistors, FETs and logic gates can be fabricated by using semiconductor and superlattice nanowires. Thermoelectric cooling system can be fabricated by using metallic nanowires. Semiconductor nanowire junctions can be used for different optoelectronic applications. Moreover, periodic arrays of magnetic nanowires hold high potential for recording media application. Nanowires are also potential candidates for sensor and bio-medical applications. Depending on what it's made from, a nanowire can have the properties of an insulator, a semiconductor or a metal.Nanowires - Implementations and Applications presents current research in the study of the properties, synthesis and application of nanowires. Topics discussed include semiconductor nanowires and heterostructure based gas sensors; transport properties of nanostructured materials; nanowire array electrodes in biosensor applications and analogies between metallic nanowires and carbon nanotubes.
Author: Jason Brian Baxter
Publisher:
ISBN:
Category :
Languages : en
Pages : 472
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Book Description
The dye sensitized solar cell (DSSC) is a promising new design for solar energy production that can achieve efficiencies above 10% at low cost. In the DSSC, light is absorbed by a monolayer of dye that is adsorbed to a high surface area, wide band gap semiconductor. The dye molecule injects a photoexcited electron into the semiconductor conduction band where it is transported to the substrate. A liquid electrolyte containing a redox mediator infiltrates the mesoporous semiconductor structure and regenerates the dye by accepting the photoexcited hole and transporting it to the counterelectrode. In this dissertation, I explore the effect of semiconductor morphology on DSSC performance. The conventional DSSC architecture consists of a film of sintered nanoparticles, and electron transport occurs by hopping from one particle to the next. We have replaced this sintered film with a dense array of ZnO nanowires to provide electrons with a direct path to the substrate that may improve transport while maintaining the high surface area required for light harvesting.
Author: Abbass A. Hashim
Publisher: BoD – Books on Demand
ISBN: 9533073187
Category : Science
Languages : en
Pages : 554
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Book Description
This potentially unique work offers various approaches on the implementation of nanowires. As it is widely known, nanotechnology presents the control of matter at the nanoscale and nanodimensions within few nanometers, whereas this exclusive phenomenon enables us to determine novel applications. This book presents an overview of recent and current nanowire application and implementation research worldwide. We examine methods of nanowire synthesis, types of materials used, and applications associated with nanowire research. Wide surveys of global activities in nanowire research are presented, as well.
