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Tailoring The Charge Transport Proberties Of Small Molecules And Organic Semiconductors
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Book Synopsis Tailoring the Charge Transport Proberties of Small Molecules and Organic Semiconductors by : Deepthi Kamath Karnad
Download or read book Tailoring the Charge Transport Proberties of Small Molecules and Organic Semiconductors written by Deepthi Kamath Karnad and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical and Spectroscopic Studies of Energy and Charge Transport in Organic Semiconductors by : Patrick Charles Tapping
Download or read book Theoretical and Spectroscopic Studies of Energy and Charge Transport in Organic Semiconductors written by Patrick Charles Tapping and published by . This book was released on 2017 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of organic semiconductor devices is heavily dependent on the precise molecular-level arrangement and overall morphology of the functional layers. In organic photovoltaic applications, exciton mobility, fission/fusion or dissociation, as well as charge transport and separation are some of the morphology-dependent processes that are of interest for efficient device design. In this work a combination of experimental and computational techniques are used to elucidate the behaviour of excitons in conjugated polymer and small-molecule semiconductor systems. While there is an emphasis on photovoltaic applications, many concepts are generally applicable to other organic electronic applications such organic light emitting diodes and photodetectors. In Chapter 3, a pump-push-probe transient absorption technique is used to observe high-energy "hot" excitons formed by photoexcitation of the conjugated polymer poly(3-hexylthiophene) (P3HT). The work demonstrates the ability to clearly isolate the transient signal of the hot exciton decay processes from the thermalised exciton population, where picosecond and sub-picosecond relaxation of hot excitons through torsional motion in the disordered polymer chain is observed. In addition, the push-induced dissociation of high-energy excitons into free charge carriers is able to be quantified and an upper bound on the exciton binding energy determined. Spectroscopic experiments on P3HT are accompanied by a hybrid quantum-classical exciton hopping model in Chapter 4. Coarse-grained molecular dynamics are used to obtain realistic structures of P3HT free chains and nanofibre aggregates, to which a Frenkel-Holstein exciton model and Monte Carlo hopping simulation is applied. This novel approach captures exciton transport properties of polymer systems with a monomer-level of detail unachievable with continuum or lattice style models, but at a large scale infeasible with fully quantum calculations. Reasonable quantitative agreement with experimental observables is obtained, offering insight into the morphology-dependence of exciton transport in conjugated polymers. In particular, the observed tendency for exciton migration to the core of the polymer aggregate can explain the relatively poor performance of highly crystalline or nanofibre-based polymer solar cells, as well as the unusually high fluorescence yield of aqueous P3HT nanoparticles. The effect of disorder in small molecule semiconductor films is investigated in Chapter 5 in the context of singlet exciton fission and triplet fusion under the influence of applied magnetic fields. A model is presented that extends the historical theory of molecular spin interactions in crystalline materials and corrects the current understanding in the literature regarding such disordered solid-phase systems. The possibility of using the fluorescence response to magnetic fields to probe the morphology and degree disorder in the films is demonstrated. Extending the model to solution-phase behaviour is then discussed in Chapter 6, where the potential of improving the light-harvesting ability of solar cells through a molecular triplet-triplet annihilation upconversion process is considered. Molecular dynamics simulations are used to obtain physical parameters and collision geometry of the emitter molecules in solution. The complications of applying a static model of triplet fusion to the dynamic solution-phase behaviour are elucidated and the potential of synthesising an ideal upconversion emitter molecule is discussed.
Book Synopsis Handbook of Conducting Polymers, Fourth Edition - 2 Volume Set by : John R. Reynolds
Download or read book Handbook of Conducting Polymers, Fourth Edition - 2 Volume Set written by John R. Reynolds and published by CRC Press. This book was released on 2019-11-14 with total page 1488 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last 10 years there have been major advances in fundamental understanding and applications and a vast portfolio of new polymer structures with unique and tailored properties was developed. Work moved from a chemical repeat unit structure to one more based on structural control, new polymerization methodologies, properties, processing, and applications. The 4th Edition takes this into account and will be completely rewritten and reorganized, focusing on spin coating, spray coating, blade/slot die coating, layer-by-layer assembly, and fiber spinning methods; property characterizations of redox, interfacial, electrical, and optical phenomena; and commercial applications.
Book Synopsis Organic Optoelectronics by : Wenping Hu
Download or read book Organic Optoelectronics written by Wenping Hu and published by John Wiley & Sons. This book was released on 2012-11-05 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by internationally recognized experts in the field with academic as well as industrial experience, this book concisely yet systematically covers all aspects of the topic. The monograph focuses on the optoelectronic behavior of organic solids and their application in new optoelectronic devices. It covers organic field-effect and organic electroluminescent materials and devices, organic photonics, materials and devices, as well as organic solids in photo absorption and energy conversion. Much emphasis is laid on the preparation of functional materials and the fabrication of devices, from materials synthesis and purification, to physicochemical properties and the basic processes and working principles of the devices. The only book to cover fundamentals, applications, and the latest research results, this is a handy reference for both researchers and those new to the field. From the contents: * Electronic process in organic solids * Organic/polymeric semiconductors for field-effect transistors * Organic/polymeric field-effect transistors * Organic circuits and organic single molecular transistors * Polymer light-emitting Diodes (PLEDs): devices and materials * Organic solids for photonics * Organic photonic devices * Organic solar cells based on small molecules * Polymer solar cells * Dye-sensitized solar cells (DSSCs) * Organic thermoelectric power devices
Book Synopsis Conjugated Polymers by : John R. Reynolds
Download or read book Conjugated Polymers written by John R. Reynolds and published by CRC Press. This book was released on 2019-03-25 with total page 909 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers properties, processing, and applications of conducting polymers. It discusses properties and characterization, including photophysics and transport. It then moves to processing and morphology of conducting polymers, covering such topics as printing, thermal processing, morphology evolution, conducting polymer composites, thin films
Book Synopsis Charge and Energy Transport in Disordered Organic Semiconductors by : Hassan Abdalla
Download or read book Charge and Energy Transport in Disordered Organic Semiconductors written by Hassan Abdalla and published by . This book was released on 2018 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solution-Processable Components for Organic Electronic Devices by : Beata Luszczynska
Download or read book Solution-Processable Components for Organic Electronic Devices written by Beata Luszczynska and published by John Wiley & Sons. This book was released on 2019-06-11 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides first-hand insights into advanced fabrication techniques for solution processable organic electronics materials and devices The field of printable organic electronics has emerged as a technology which plays a major role in materials science research and development. Printable organic electronics soon compete with, and for specific applications can even outpace, conventional semiconductor devices in terms of performance, cost, and versatility. Printing techniques allow for large-scale fabrication of organic electronic components and functional devices for use as wearable electronics, health-care sensors, Internet of Things, monitoring of environment pollution and many others, yet-to-be-conceived applications. The first part of Solution-Processable Components for Organic Electronic Devices covers the synthesis of: soluble conjugated polymers; solution-processable nanoparticles of inorganic semiconductors; high-k nanoparticles by means of controlled radical polymerization; advanced blending techniques yielding novel materials with extraordinary properties. The book also discusses photogeneration of charge carriers in nanostructured bulk heterojunctions and charge carrier transport in multicomponent materials such as composites and nanocomposites as well as photovoltaic devices modelling. The second part of the book is devoted to organic electronic devices, such as field effect transistors, light emitting diodes, photovoltaics, photodiodes and electronic memory devices which can be produced by solution-based methods, including printing and roll-to-roll manufacturing. The book provides in-depth knowledge for experienced researchers and for those entering the field. It comprises 12 chapters focused on: ? novel organic electronics components synthesis and solution-based processing techniques ? advanced analysis of mechanisms governing charge carrier generation and transport in organic semiconductors and devices ? fabrication techniques and characterization methods of organic electronic devices Providing coverage of the state of the art of organic electronics, Solution-Processable Components for Organic Electronic Devices is an excellent book for materials scientists, applied physicists, engineering scientists, and those working in the electronics industry.
Book Synopsis Introduction to Organic Electronic and Optoelectronic Materials and Devices by : Sam-Shajing Sun
Download or read book Introduction to Organic Electronic and Optoelectronic Materials and Devices written by Sam-Shajing Sun and published by CRC Press. This book was released on 2008-05-29 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflecting rapid growth in research and development on organic/polymeric electronic and photonic materials and devices, Introduction to Organic Electronic and Optoelectronic Materials and Devices provides comprehensive coverage of the state-of-the-art in an accessible format. The book presents fundamentals, principles, and mechanisms complem
Book Synopsis Simulations of Charge Transport in Organic Compounds by : Thorsten Vehoff
Download or read book Simulations of Charge Transport in Organic Compounds written by Thorsten Vehoff and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2010 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: To aid the design of organic semiconductors, we study the charge transport properties of organic liquid crystals and single crystals. The aim is to find structure-property relationships linking the chemical structure as well as the morphology with the bulk charge carrier mobility of the compounds. To this end, molecular dynamics (MD) simulations are performed yielding realistic equilibrated morphologies. Partial charges and molecular orbitals are calculated using quantum chemical methods. The molecular orbitals are then mapped onto the molecular positions and orientations, which allows calculation of the transfer integrals between nearest neighbors using the molecular orbital overlap method. Thus realistic transfer integral distributions and their autocorrelations are obtained. In case of organic crystals two descriptions of charge transport, namely semi-classical dynamics (SCD) and kinetic Monte Carlo (KMC) based on Marcus rates, are studied. In KMC one assumes that the wave function is localized on one molecule, while in SCD it is spread over a limited number of neighboring molecules. The results are compared amongst each other and, where available, with experimental data.
Book Synopsis Organic Field-Effect Transistors by : Zhenan Bao
Download or read book Organic Field-Effect Transistors written by Zhenan Bao and published by CRC Press. This book was released on 2018-10-03 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: The remarkable development of organic thin film transistors (OTFTs) has led to their emerging use in active matrix flat-panel displays, radio frequency identification cards, and sensors. Exploring one class of OTFTs, Organic Field-Effect Transistors provides a comprehensive, multidisciplinary survey of the present theory, charge transport studies, synthetic methodology, materials characterization, and current applications of organic field-effect transistors (OFETs). Covering various aspects of OFETs, the book begins with a theoretical description of charge transport in organic semiconductors at the molecular level. It then discusses the current understanding of charge transport in single-crystal devices, small molecules and oligomers, conjugated polymer devices, and charge injection issues in organic transistors. After describing the design rationales and synthetic methodologies used for organic semiconductors and dielectric materials, the book provides an overview of a variety of characterization techniques used to probe interfacial ordering, microstructure, molecular packing, and orientation crucial to device performance. It also describes the different processing techniques for molecules deposited by vacuum and solution, followed by current technological examples that employ OTFTs in their operation. Featuring respected contributors from around the world, this thorough, up-to-date volume presents both the theory behind OFETs and the latest applications of this promising technology.
Book Synopsis Flexible Solar Cells by : Mario Pagliaro
Download or read book Flexible Solar Cells written by Mario Pagliaro and published by John Wiley & Sons. This book was released on 2008-11-21 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the decline in the world's natural resources, the need for new and cheaper energy sources is evolving. One such source is the sun which generates heat and light which can be harnessed and used to our advantage. This reference book introduces the topic of photovoltaics in the form of flexible solar cells. There are explanations of the principles behind this technology, the engineering required to produce these products and the future possibilities offered by this technology. The chemistry and physics of the cells (both organic and inorganic) are clarified as well as production methods, with information how this can then be applied to the nanoscale as well. A complete guide to this new and exciting way of producing energy which will be invaluable to a variety of people from material scientists, chemists, electrical engineers, to management consultants and politicians.
Book Synopsis Handbook of Organic Materials for Electronic and Photonic Devices by : Oksana Ostroverkhova
Download or read book Handbook of Organic Materials for Electronic and Photonic Devices written by Oksana Ostroverkhova and published by Woodhead Publishing. This book was released on 2018-11-30 with total page 911 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Organic Materials for Electronic and Photonic Devices, Second Edition, provides an overview of the materials, mechanisms, characterization techniques, structure-property relationships, and most promising applications of organic materials. This new release includes new content on emerging organic materials, expanded content on the basic physics behind electronic properties, and new chapters on organic photonics. As advances in organic materials design, fabrication, and processing that enabled charge unprecedented carrier mobilities and power conversion efficiencies have made dramatic advances since the first edition, this latest release presents a necessary understanding of the underlying physics that enabled novel material design and improved organic device design. Provides a comprehensive overview of the materials, mechanisms, characterization techniques, and structure property relationships of organic electronic and photonic materials Reviews key applications, including organic solar cells, light-emitting diodes electrochemical cells, sensors, transistors, bioelectronics, and memory devices New content to reflect latest advances in our understanding of underlying physics to enable material design and device fabrication
Book Synopsis Handbook of Organic Materials for Optical and (Opto)Electronic Devices by : Oksana Ostroverkhova
Download or read book Handbook of Organic Materials for Optical and (Opto)Electronic Devices written by Oksana Ostroverkhova and published by Elsevier. This book was released on 2013-08-31 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small molecules and conjugated polymers, the two main types of organic materials used for optoelectronic and photonic devices, can be used in a number of applications including organic light-emitting diodes, photovoltaic devices, photorefractive devices and waveguides. Organic materials are attractive due to their low cost, the possibility of their deposition from solution onto large-area substrates, and the ability to tailor their properties. The Handbook of organic materials for optical and (opto)electronic devices provides an overview of the properties of organic optoelectronic and nonlinear optical materials, and explains how these materials can be used across a range of applications.Parts one and two explore the materials used for organic optoelectronics and nonlinear optics, their properties, and methods of their characterization illustrated by physical studies. Part three moves on to discuss the applications of optoelectronic and nonlinear optical organic materials in devices and includes chapters on organic solar cells, electronic memory devices, and electronic chemical sensors, electro-optic devices.The Handbook of organic materials for optical and (opto)electronic devices is a technical resource for physicists, chemists, electrical engineers and materials scientists involved in research and development of organic semiconductor and nonlinear optical materials and devices. Comprehensively examines the properties of organic optoelectronic and nonlinear optical materials Discusses their applications in different devices including solar cells, LEDs and electronic memory devices An essential technical resource for physicists, chemists, electrical engineers and materials scientists
Book Synopsis Thin-Film Transistors by : Cherie R. Kagan
Download or read book Thin-Film Transistors written by Cherie R. Kagan and published by CRC Press. This book was released on 2003-02-25 with total page 543 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a single-source treatment of developments in TFT production from international specialists. It interweaves overlapping areas in multiple disciplines pertinent to transistor fabrication and explores the killer application of amorphous silicon transistors in active matrix liquid crystal displays. It evaluates the preparation of polycrystallin
Book Synopsis Elucidation of Chemistry-Structure-Function Relationships in Molecular Semiconductors for Organic Electronic Applications by : Jeni Christine Sorli
Download or read book Elucidation of Chemistry-Structure-Function Relationships in Molecular Semiconductors for Organic Electronic Applications written by Jeni Christine Sorli and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular semiconductors are promising candidates for the active components of organic electronic devices as their optoelectronic properties can be tuned at the onset of synthesis, and they can be incorporated into lightweight, large-area, flexible devices at low costs. Yet, there are numerous challenges associated with molecular semiconductor systems and their commercial implementation, which largely stem from the structural heterogeneities present in polycrystalline thin films that strongly influence charge transport in devices. The microstructure of thin film active layers is dependent on both chemical structure and the processing conditions used. Thus, it is important to develop an understanding for the complex relationships that govern these systems. This thesis explores the development of chemistry-processing-structure-function relationships across multiple length scales in small molecule organic semiconductor systems. First, we explored the relationships between chemical structure and optoelectronic properties through targeted design of coronene derivatives for application in UV-absorbing, visibly transparent solar cells. We calculated the frontier orbital and excited state transition energies of over 350 candidate compounds and used the calculations to screen for promising molecules for synthesis and characterization. From our screening procedure, we selected and synthesized three coronene derivatives for use as donors in organic photovoltaic (OPV) active layers to produce visibly transparent OPVs, and in doing so demonstrated how integrated computational and experimental efforts can accelerate materials design. It is also important to understand how molecular semiconductors pack in the solid-state to elucidate the relationships between solid-state structure and device function. We explored the role of halogenated contorted hexabenzocoronene (cHBC) derivatives on the degradation of organic solar cells during stability testing and find that both fluorinated and chlorinated cHBCs, that start out amorphous as-deposited, crystallize during aging. The crystallization of cHBC derivatives produces gaps at the acceptor-buffer layer interface that hinder charge extraction, which results in the degradation of OPV device performance. We examined how atomistic substitution in the side group of triisopropylsilylethynylpentacene (TIPS-Pn) to produce triisopropylgermanylethynyl-pentacene (TIPGe-Pn), which maintains the size of the side group but increases its electron density, allows TIPGe-Pn to access a much broader structural phase space than TIPS-Pn. This work establishes that the solid-state packing of functionalized acenes depends on both the size of the side group and electron density, which may be tuned with simple atomistic substitutions. Finally, we explored the impact of grain boundaries on the kinetics of polymorphic transformations in a core-chlorinated naphthalene tetracarboxylic diimide. We determined that grain boundaries can lower the energy barrier by initiating polymorphic transformations. This work demonstrates the importance of grain boundaries, which are common in polycrystalline organic semiconductors, not only for their impact on charge transport but also in initiation of polymorphic transformations. Collectively, the work in this thesis highlights the importance of developing robust chemistry-processing-structure-function relationships that can guide material development. We demonstrate methodologies and illuminate concepts that will allow for further optimization and improvement to the performance and stability of organic electronics in the future.
Book Synopsis Simulations of Charge Transport in Organic Compounds by :
Download or read book Simulations of Charge Transport in Organic Compounds written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: To aid the design of organic semiconductors, we study the charge transport properties of organic liquid crystals, i.e. hexabenzocoronene and carbazole macrocycle, and single crystals, i.e. rubrene, indolocarbazole and benzothiophene derivatives (BTBT, BBBT). The aim is to find structure-property relationships linking the chemical structure as well as the morphology with the bulk charge carrier mobility of the compounds. To this end, molecular dynamics (MD) simulations are performed yielding realistic equilibrated morphologies. Partial charges and molecular orbitals are calculated based on single molecules in vacuum using quantum chemical methods. The molecular orbitals are then mapped onto the molecular positions and orientations, which allows calculation of the transfer integrals between nearest neighbors using the molecular orbital overlap method. Thus we obtain realistic transfer integral distributions and their autocorrelations. In case of organic crystals the differences between two descriptions of charge transport, namely semi-classical dynamics (SCD) in the small polaron limit and kinetic Monte Carlo (KMC) based on Marcus rates, are studied. The liquid crystals are investigated solely in the hopping limit. To simulate the charge dynamics using KMC, the centers of mass of the molecules are mapped onto lattice sites and the transfer integrals are used to compute the hopping rates. In the small polaron limit, where the electronic wave function is spread over a limited number of neighboring molecules, the Schroedinger equation is solved numerically using a semi-classical approach. The results are compared for the different compounds and methods and, where available, with experimental data. The carbazole macrocycles form columnar structures arranged on a hexagonal lattice with side chains facing inwards, so columns can closely approach each other allowing inter-columnar and thus three-dimensional transport. When taking only intra-columnar transport into account, t.
Book Synopsis Morphology, Charge Transport Properties, and Molecular Doping of Thiophene-based Organic Semiconducting Thin Films by : Patrick Pingel
Download or read book Morphology, Charge Transport Properties, and Molecular Doping of Thiophene-based Organic Semiconducting Thin Films written by Patrick Pingel and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
