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Self Organized Organic Semiconductors
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Book Synopsis Self-Organized Organic Semiconductors by : Quan Li
Download or read book Self-Organized Organic Semiconductors written by Quan Li and published by John Wiley & Sons. This book was released on 2011-03-03 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the exciting topic on self-organized organic semiconductors – from materials to device applications. It offers up-to-date and accessible coverage of self-organized semiconductors for organic chemistry, polymer science, liquid crystals, materials science, material engineering, electrical engineering, chemical engineering, optics, optic-electronics, nanotechnology and semiconductors. Chapters cover chemistry, physics, processing, and characterization. The applications include photovoltaics, light-emitting diodes (LEDs), and transistors.
Book Synopsis Self-Organized Organic Semiconductors by : Quan Li
Download or read book Self-Organized Organic Semiconductors written by Quan Li and published by Wiley. This book was released on 2011-04-26 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the exciting topic on self-organized organic semiconductors – from materials to device applications. It offers up-to-date and accessible coverage of self-organized semiconductors for organic chemistry, polymer science, liquid crystals, materials science, material engineering, electrical engineering, chemical engineering, optics, optic-electronics, nanotechnology and semiconductors. Chapters cover chemistry, physics, processing, and characterization. The applications include photovoltaics, light-emitting diodes (LEDs), and transistors.
Book Synopsis Electronic Processes in Organic Semiconductors by : Anna Köhler
Download or read book Electronic Processes in Organic Semiconductors written by Anna Köhler and published by John Wiley & Sons. This book was released on 2015-06-08 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first advanced textbook to provide a useful introduction in a brief, coherent and comprehensive way, with a focus on the fundamentals. After having read this book, students will be prepared to understand any of the many multi-authored books available in this field that discuss a particular aspect in more detail, and should also benefit from any of the textbooks in photochemistry or spectroscopy that concentrate on a particular mechanism. Based on a successful and well-proven lecture course given by one of the authors for many years, the book is clearly structured into four sections: electronic structure of organic semiconductors, charged and excited states in organic semiconductors, electronic and optical properties of organic semiconductors, and fundamentals of organic semiconductor devices.
Book Synopsis Self-organization of Organic Molecules by : Jacob Martin
Download or read book Self-organization of Organic Molecules written by Jacob Martin and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic semiconductors have advantages over their inorganic counterparts including low cost, flexibility, and eco-friendliness. While organic semiconductors have interesting uses in devices such as solar cells, photovoltaic cells, and even flexible electronics, they are not competitive with inorganics due to their lower conductivity. One reason for this lower conductivity is due to their amorphous structure, making it difficult for electrons to tunnel from one adjacent molecule to the next. A possible method to increase the conductivity of organic semiconductors is crystallization via self-assembly. This work computationally examines the self-organization of an organic semiconductor, pentacene, on a simple and structurally similar surface, graphene. Ab initio calculations were used to determine the ground-state energy of a single pentacene molecule on a graphene sheet at various orientations, where the pentacene molecule is incrementally translated in the x and y directions at multiple angles. These energies are used to create potential energy maps of the system relative to the minima. This allows us to predict how pentacene organizes on graphene due to molecule-substrate interactions. The results in this study identify multiple configurations with relative energies less than that of room temperature, 27.8% of all considered. Additionally, 7.8% have a relative energy within 12.5 meV. Room temperature, 25 meV, is used as a comparative value to show how close (or far away) energy configurations are to each other. However, as it is more difficult for a molecule to thermally diffuse across a surface as all atoms would need to move in a uniform manner, a smaller energy range (12.5 meV) is also evaluated. These results demonstrate a need for an additional driving force (i.e., molecule-molecule interactions) for the self-organization of pentacene on graphene and provides a more complete understanding of the pentacene-graphene system.
Book Synopsis Investigating the Nucleation, Growth, and Energy Levels of Organic Semiconductors for High Performance Plastic Electronics by : Ajay Virkar
Download or read book Investigating the Nucleation, Growth, and Energy Levels of Organic Semiconductors for High Performance Plastic Electronics written by Ajay Virkar and published by Springer Science & Business Media. This book was released on 2011-09-29 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis details the significant progress made in improving the performance of organic transistors and the network conductivity of carbon nanotubes. The first section investigates organic semiconductor nucleation and growth on the most common dielectric surface used to fabricate organic thin film transistors. The nucleation and growth of the semiconductor was determined to be a critical factor affecting the device performance. Excellent dielectric modification layers, which promote desirable semiconductor growth leading to high conductivity were identified, and a technologically relevant deposition technique was developed to fabricate high quality dielectric modification layers over large areas. This may represent an important step towards the realization of large area organic circuity. In the final section, lessons learned from studying organic semiconductor nucleation and growth were utilized to improve the conductivity of carbon nanotube networks. Selective nucleation of materials at the junctions between nanotubes in the network significantly decreased the network's sheet resistance. The resulting networks may be promising candidates for transparent electrodes with a variety of optoelectronic applications.
Book Synopsis Molecular Spintronics by : Marta Galbiati
Download or read book Molecular Spintronics written by Marta Galbiati and published by Springer. This book was released on 2015-10-15 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis targets molecular or organic spintronics and more particularly the spin polarization tailoring opportunities that arise from the ferromagnetic metal/molecule hybridization at interfaces: the new concept of spinterface. Molecular or organic spintronics is an emerging research field at the frontier between organic chemistry and spintronics. The manuscript is divided into three parts, the first of which introduces the basic concepts of spintronics and advantages that molecules can bring to this field. The state of the art on organic and molecular spintronics is also presented, with a special emphasis on the physics and experimental evidence for spinterfaces. The book’s second and third parts are dedicated to the two main experimental topics investigated in the thesis: Self-Assembled Monolayers (SAMs) and Organic Semiconductors (OSCs). The study of SAMs-based magnetic tunnel nanojunctions reveals the potential to modulate the properties of such devices “at will,” since each part of the molecule can be tuned independently like a “LEGO” building block. The study of Alq3-based spin valves reveals magnetoresistance effects at room temperature and is aimed at understanding the respective roles played by the two interfaces. Through the development of these systems, we demonstrate their potential for spintronics and provide a solid foundation for spin polarization engineering at the molecular level.
Book Synopsis Self-Assembled Organic Semiconductor Quantum Boxes and Wires from Block Copolymers by :
Download or read book Self-Assembled Organic Semiconductor Quantum Boxes and Wires from Block Copolymers written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low dimensional organic semiconductors such as quantum boxes, quantum wires, or superlattices are predicted to exhibit enhanced or novel electronic and optical properties for applications in solid state electronic and optoelectronic devices in ways similar to low dimensional inorganic semiconductors. However, the relatively small charge carrier and excition Bohr radii of organic semiconductors (ca. 1.0-1.5 nm) has heretofore made it difficult to prepare organic semiconductor heterostructures with quantum confinement effects. Ultrasmall semiconducting polymer quantum boxes and wires with confinement volumes of 1-2 nm3 have been prepared in our laboratory by self-organization of blends of ABA block conjugated copolymers with a parent homopolymer. Observation of new optical transitions, enhanced luminescence, and stability of luminescence at high electric fields confirmed the confinement of excitons in the organic quantum boxes and wires.
Book Synopsis Organic Semiconductor Interfaces with Insulators and Metals by : Kathrin Müller
Download or read book Organic Semiconductor Interfaces with Insulators and Metals written by Kathrin Müller and published by Cuvillier Verlag. This book was released on 2009-10-12 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electronic interactions of self-assembled organic semiconductors with metals, metal-oxides and ultrathin insulator surfaces have been investigated by complementary analysis techniques comprising scanning tunnelling microscopy and spectroscopy, low energy electron diffraction, x-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. Two model systems have been chosen and investigated: The first model system comprises the electronic interactions and the self-assembly of pentacene molecules on the Cu(110) as well as on the oxidized Cu(110) surface. In a second model system the interface of octa-ethyl porphyrins with ultrathin insulator films and metals has been investigated. The adsorption of molecules on insulator surfaces is especially interesting due to the strong reduction of the electronic and chemical interactions between the molecules and the substrate. The investigation of pentacene on the Cu(110) surface revealed a multi-phase behaviour, which is characterized by molecular bending, molecular mobility, different relative orientation of the molecules and different packing densities. Furthermore, the influence of the adsorbate layer on the Shockley surface state of the Cu(110) has been investigated. A complex interplay of different phenomena, like Pauli repulsion, charge transfer, mixing and hybridization of electronic states as well as the polarization of the organic adsorbate in the surface dipolar field, lead to a shift of the surface state to higher binding energies. Additionally, the occupation of the surface state is increased for the adsorption of one monolayer of pentacene. This particular behaviour has not been reported for any other molecular/metal system so far. The adsorption of pentacene on the oxidized Cu(110) surface reveals that the electronic interactions and the surface corrugation determine the self-assembly of the molecular ad-layer. The second project in this thesis comprises the electronic interactions of porphyrin molecules, another representative of molecular semiconductors, with ultrathin insulator layers. The main question here was how the electronic interactions between the molecules and the substrate change with increasing insulator thickness and whether it is possible to electronically decouple the molecules from the substrate for one or two monolayer thin insulator films. A detailed growth study of NaCl on different metal surfaces led to samples, which were homogenously covered with 1 ML of NaCl and thus could be investigated by non-local analysis techniques like UPS and XPS. Low temperature STS and angle-resolved UPS data showed that the CuOEP molecules strongly interact with the Cu(111) and Ag(111) substrate leading to unoccupied electronic states in the band gap of the molecule on Ag(111) and to quenching of the Shockley surfaces state for the adsorption of CuOEP on Cu(111). Further UPS and XPS measurements revealed a strong influence of the chemical environment on the binding energies, as identified by shifted peaks for CuOEP on NaCl compared to CuOEP on the metal surfaces. These peak shifts have been related to strong screening of the photoelectron hole.
Book Synopsis Organic Electronics by : Hagen Klauk
Download or read book Organic Electronics written by Hagen Klauk and published by John Wiley & Sons. This book was released on 2006-12-13 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Edited and written by the leading researchers and engineers from such companies as Philips, 3M, Xerox, Infineon, PlasticLogic, Eastman Kodak, Dupont, AIXTRON, and Hueck Folien, this book presents unrivalled and undiluted expertise from those who know best how to assess the risks, opportunities and where this technology is really heading. As such, this practical approach complements the more scientific and fundamentals-oriented literature on the market by providing readers with a first-hand insight into industrial activities to commercialize organic electronics. Following an introduction to the topic, including the history, motivation, benefits and potentials, it reviews recent advances and covers all three important facets of organic electronics: the chemical compounds and materials, manufacturing techniques, and the resulting devices together with their current applications.
Author :Schinke Janusz Publisher :Sudwestdeutscher Verlag Fur Hochschulschriften AG ISBN 13 :9783838151441 Total Pages :204 pages Book Rating :4.1/5 (514 download)
Book Synopsis Processing and Characterization of Organic Thin Films by : Schinke Janusz
Download or read book Processing and Characterization of Organic Thin Films written by Schinke Janusz and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2015-08-20 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work deals with two of the major challenges in organic electronics: (i) the optimization of organic/inorganic contacts through interface engineering and (ii) the prevention of intermixing in multilayer solution-processed devices. (i) A suitable method to control organic/inorganic interfaces, not only in terms of interface energetics but also to control the morphology of subsequent layers is the use of self-assembled monolayers (SAMs). Various SAMs from commercially available precursor molecules have been investigated in detail with the aim to optimize the processing parameters for high-throughput fabrication. On the basis of the gained knowledge and experience SAMs composed of novel molecules with strong dipole moments were investigated. (ii) The second part of this work addresses the problem of intermixing of solution-processed thin films. To this end, the film formation was studied of n-type semiconductor materials based on 1,4,5,8-naphthalenetetracarboxdiimide (NDI) with additional thermally cleavable side groups that govern the solubility of the molecules. Both polymer and small molecule organic semiconductors were studied.
Book Synopsis Self-assembled Organic Semiconductors by : Lisa Renee Pattison
Download or read book Self-assembled Organic Semiconductors written by Lisa Renee Pattison and published by . This book was released on 2006 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this thesis work is to enhance the charge carrier mobility in organic semiconductors using self-assembly techniques. We discuss and demonstrate two different self-assembly mechanisms for organic semiconducting thin films. The first technique is to exploit the inherent self-alignment of liquid crystalline polymers. The second technique, graphoepitaxy, has been adopted from the processing of inorganic semiconductors. Graphoepitaxy utilizes surface topography to promote the oriented growth of crystals on amorphous substrates. In addition to studying the effects that self-assembly has on the structure of thin-films, we probe the effects of increased order on the electronic properties by the fabrication and characterization of organic thin film transistors. Most notably, we find that the charge carrier mobility is increased by a factor of 4-6 for aligned, liquid crystalline polymeric semiconductors and by a factor of 8-10 for small molecules oriented by graphoepitaxy.
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.
Download or read book Organic Electronics written by Franky So and published by CRC Press. This book was released on 2009-11-24 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the near future, organic semiconductors may be used in a variety of products, including flat-screen TVs, e-book readers, and third-generation organic photovoltaics applications, to name just a few. While organic electronics has received increased attention in scientific journals, those working in this burgeoning field require more in-depth cover
Book Synopsis Nanoscale Templating and Self-assembly of Organic Semiconductors by : James Francis Hulvat
Download or read book Nanoscale Templating and Self-assembly of Organic Semiconductors written by James Francis Hulvat and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Improvements in organic electronic materials could lead to novel device applications, ranging from large-area, flexible displays to light weight, plastic electronics. Progress on these applications would benefit from development of low-cost, aqueous, solution-based fabrication techniques for organic semiconductors. Supramolecular self-assembly enables molecules to organize in complex structures through non-covalent interactions. The nanoscale structure and aggregation of organic semiconductors influence conductivity, charge mobility and luminescence. We developed three approaches to enhance the performance of organic semiconductors through molecular self-assembly. The first uses a liquid crystalline (LC) template to mediate electrochemical polymerization of poly(3,4-ethyldioxythiophene) (PEDOT), a conducting polymer used for hole injection in organic light emitting diodes (OLED). Monomers were polymerized in the cylindrical, hydrophobic cores of a hexagonal, lyotropic LC formed by a non-ionic amphiphile in water, The templated, conducting polymer films exhibited anisotropic optical properties and increased conductivity as a direct result of the nanoscale, self-organized structure of the template. Another approach was used to control molecular order by preparing organic semiconductors that are themselves liquid crystalline. We developed a novel series of triblock oligo(phenylene vinylene) (OPV) amphiphiles that form thermotropic and lyotropic LC mesophases. The self-organized, layered structure of these mesophases influences aggregation of OPV, enhancing fluorescence in the liquid crystalline state compared with disordered films. These OPV-amphiphiles are the first example of a water-soluble oligo(phenylene vinylene) that can self-organize into aligned, well-ordered, highly fluorescent films. In a third system, a triblock, dendron rod-coil (DRC) molecule containing a quaterthiophene segment was prepared and its self-assembly and electronic properties investigated. In non-polar solvents, this molecule formed high aspect ratio, supramolecular nanowires containing stacked oligo(thiophene) segments. These self-assembled nanowires formed conductive films that were aligned by an electric field. Using these three systems, we demonstrate how nanoscale templating and self-assembly can enhance the performance of thiophene- and phenylene vinylene-based organic semiconductors.
Book Synopsis Functionalization of Organic Semiconductors and Other Carbon-based Materials by Self-assembled Monolayers (SAMs) and Charge Transport in Organic Field-effect Transistors (OFETs) by : Bumsu Lee
Download or read book Functionalization of Organic Semiconductors and Other Carbon-based Materials by Self-assembled Monolayers (SAMs) and Charge Transport in Organic Field-effect Transistors (OFETs) written by Bumsu Lee and published by . This book was released on 2012 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Semiconductors written by and published by . This book was released on 1969 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Organic Semiconductors for Self-assembled Monolayer Field Effect Transistors by : Kexin Lu
Download or read book Organic Semiconductors for Self-assembled Monolayer Field Effect Transistors written by Kexin Lu and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular self-assembly has recently attracted significant attention for possible application in organic electronic and optoelectronic devices, such as self-assembled monolayer field-effect transistors (SAMFETs) and functional self-assembled integrated circuits. Self-assembly combines the advantages of low temperature solution processability, regio-selective monolayer adsorption and nano-scale control of film thickness. Much progress has been made in improving device performance using self-assembled monolayers (SAMs). However, most SAMFET devices reported to date showed current modulation only with submicrometre channels, with low device yields and poor reproducibility as a result of limited lateral interconnection of the semiconducting layer. In an attempt to address these issues, this thesis presents an investigation of the synthesis and properties of conjugated SAM molecules for use as the charge transporting layer in SAMFETs. Chapter 1 gives a comprehensive introduction to SAM-based surface systems, organic semiconductors and their use in OFETs and SAMFETs. Chapter 2 discusses attempts to design and synthesise p-type conjugated molecules capable of self-assembly on oxide surfaces based on a phenylene-bithiophene semiconducting core. The optical and electrochemical properties, as well as the thermal behaviour of these molecules are studied in detail. This theme is carried over to Chapter 3, which describes the synthesis, chemical and physical characterisation of two families of n-type SAM molecules. These molecules consist of NTCDI cores with hexyl or cyclohexyl chains as end-capping groups. Incorporation of a selection of materials as the active layer in OFETs or SAMFETs to evaluate the charge transport is demonstrated in Chapter 4. Monolayer films based on p-type monochlorosilane-terminated SAM molecules are made using the solution assembly technique and characterised by contact angle and AFM. OFETs made from DH-PTTP by both thermal evaporation and spin coating show high mobilities comparable to the best values reported in the literature. Top-contact SAMFETs show a hole mobility of 1.1 × 10-3 cm2V-1s-1 in air, consistent with those of solution processed DH-PTTP based OFETs. Finally, an overview of the project and some suggestions for future work are presented in Chapter 5.
