AFM Investigation of One-dimensional Self-assembly of N-type Organic Semiconducting Molecules PDF Download
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Author: Aniket Datar Publisher: ISBN: Category : Languages : en Pages : 152
Book Description
The use of organic semiconductors in electronic devices emerged with the fabrication of photovoltaic cells with organic dyes and in recent years their applications have extended to field effect transistors (FETs) and light emitting devices (LEDs). Increased attention towards organic semiconductors and materials is mainly due to flexibility they provide with respect to the properties of individual molecules and fabrication in desired shapes. Among n-type semiconductors, perylenetetracaboxylicdiimide (PTCDI), is gaining increasing attention due to its high photo and thermal stability. With the modification of side chains with different functionalities, one can tune the solubility of molecule in different solvent and the morphology of resultant molecular aggregates. Following work presents the use of PTCDI molecules with three different side chains attached to PTCDI core. We investigated the effect of different side chains on resultant morphology when fabricated through different processing techniques. Fabrication techniques applied are solution based processing and surface assisted solvent vapor annealing. The later technique provides a better control over the size and shape of resultant nanocrystals. We investigated the size and optical properties of nanocrystals formed with the help of atomic force microscopy (AFM) and near-field scanning optical microscopy (NSOM). Through solution based and surface assisted solvent vapor annealing processes under different conditions, we have fabricated nanocrystals with different aspect ratios, size and shape. Currently we are working on investigation of electrical measurements for application of nanocrystals in real time electronic devices.
Author: Aniket Datar Publisher: ISBN: Category : Languages : en Pages : 152
Book Description
The use of organic semiconductors in electronic devices emerged with the fabrication of photovoltaic cells with organic dyes and in recent years their applications have extended to field effect transistors (FETs) and light emitting devices (LEDs). Increased attention towards organic semiconductors and materials is mainly due to flexibility they provide with respect to the properties of individual molecules and fabrication in desired shapes. Among n-type semiconductors, perylenetetracaboxylicdiimide (PTCDI), is gaining increasing attention due to its high photo and thermal stability. With the modification of side chains with different functionalities, one can tune the solubility of molecule in different solvent and the morphology of resultant molecular aggregates. Following work presents the use of PTCDI molecules with three different side chains attached to PTCDI core. We investigated the effect of different side chains on resultant morphology when fabricated through different processing techniques. Fabrication techniques applied are solution based processing and surface assisted solvent vapor annealing. The later technique provides a better control over the size and shape of resultant nanocrystals. We investigated the size and optical properties of nanocrystals formed with the help of atomic force microscopy (AFM) and near-field scanning optical microscopy (NSOM). Through solution based and surface assisted solvent vapor annealing processes under different conditions, we have fabricated nanocrystals with different aspect ratios, size and shape. Currently we are working on investigation of electrical measurements for application of nanocrystals in real time electronic devices.
Author: Chaoying Fu Publisher: ISBN: Category : Languages : en Pages :
Book Description
"Molecular self-assembly, a promising bottom-up strategy for nanofabrication of functional devices, utilizes non-covalent interactions to yield well-defined supramolecular nanostructures. This method provides an inexpensive and versatile route to build the desired nanoarchitectures as compared to current top-down nanolithography methods. On the other hand, understanding and control of the supramolecular ordering of organic semiconducting (OSC) molecules at the interface is also crucial for optimization of thin-film optoelectronic applications. The supramolecular packing of OSC molecules in an active layer at the interface defines the exciton and charge transport properties and hence influences the device efficiency. This thesis studies the self-assembly properties of tailor-made OSC molecules. These molecules possess extended [pi]-conjugation and non-covalent intermolecular binding (e.g. hydrogen bonding) motifs and were designed to explore on-surface assembly of functional supramolecular architectures and two-dimensional (2D) polymers ("organic graphenes"). A series of derivatives of two isomeric tetrathienoanthracenes (TTAs), p-type semiconducting molecules, are designed and synthesized with different functionalities enabling their further chemical modification, their self-assembly via weak intermolecular interactions (i.e. hydrogen bonding, halogen bonding) and their polymerization. The versatile TTA derivatives are used to build 2D nanostructures and investigate the role of building block symmetry in controlling the order. The supramolecular packing of the OSC molecules at the interface is highly relevant for applications in organic field effect transistors (OFETs), where a charge transport mainly occurs within the first few layers close to the organic-dielectric interface. In this thesis, the initial stages of film growth of n-type semiconductors, mono-alkylated naphthalenediimides (NDI-R), are explored in solution and through vapor deposition on both conductive (HOPG) and insulating (SiO2) surfaces. The study indicates the retention of hydrogen bonding throughout the thin film growth, on both surfaces, mimicking the electrode and gate interfaces of actual OFET devices. Finally, the supramolecular ordering of diaryl diketopyrrolopyrrole (DPP), a common moiety for high-efficiency ambipolar OSC, is investigated as models of the corresponding oligomers and polymers. The effect of aryl-substituents on the hydrogen bonding of the structurally similar (hetero)aromatic-DPP building blocks is investigated in both molecular 2D self-assembly and crystal structures. Also, the mutual roles of alkyl chains and pending aryl substituents on dialkylated diaryl-DPP molecular planarity and packing are thoroughly assessed at both monolayer and bulk crystal levels.Overall, this thesis explores the relationship between the molecular structures and the on-surface supramolecular orderings of organic semiconducting molecules. It also establishes a general methodology for studying on-surface assemblies of such materials, integrating scanning tunneling microscopy (STM), atomic force microscopy (AFM), XRD and DFT analysis to create an overall view of molecular assembly growing from the surface, and evolving into thin films and, eventually, bulk crystals." --
Author: Katsuhiko Ariga Publisher: Elsevier ISBN: 0323994733 Category : Technology & Engineering Languages : en Pages : 648
Book Description
Materials Nanoarchitectonics: From Integrated Molecular Systems to Advanced Devices provides the latest information on the design and molecular manipulation of self-organized hierarchically structured systems using tailor-made nanoscale materials as structural and functional units. The book is organized into three main sections that focus on molecular design of building blocks and hybrid materials, formation of nanostructures, and applications and devices. Bringing together emerging materials, synthetic aspects, nanostructure strategies, and applications, the book aims to support further progress, by offering different perspectives and a strong interdisciplinary approach to this rapidly growing area of innovation. This is an extremely valuable resource for researchers, advanced students, and scientists in industry, with an interest in nanoarchitectonics, nanostructures, and nanomaterials, or across the areas of nanotechnology, chemistry, surface science, polymer science, electrical engineering, physics, chemical engineering, and materials science. - Offers a nanoarchitectonic perspective on emerging fields, such as metal-organic frameworks, porous polymer materials, or biomimetic nanostructures - Discusses different approaches to utilizing "soft chemistry" as a source for hierarchically organized materials - Offers an interdisciplinary approach to the design and construction of integrated chemical nano systems - Discusses novel approaches towards the creation of complex multiscale architectures
Author: Alex Li Dequan Publisher: CRC Press ISBN: 9814364312 Category : Science Languages : en Pages : 464
Book Description
In the past several decades, molecular self-assembly has emerged as one of the main themes in chemistry, biology, and materials science. This book compiles and details cutting-edge research in molecular assemblies ranging from self-organized peptide nanostructures and DNA-chromophore foldamers to supramolecular systems and metal-directed assemblies
Author: Makoto Fujita Publisher: Springer ISBN: 354046591X Category : Science Languages : en Pages : 255
Book Description
Self-assembly is undoubtedly a topic of special interest in current chemistry and is related to very wide scientific areas. Recent progress in this field seems to be featured by the construction of well-defined discrete systems exploiting complementary hydrogen bonding as well as coordination bonding. Seven leading international experts introduce the current topics in this very interesting field, focusing on two major subjects: organic assemblies and inorganic assemblies. All researchers who are interested in molecular recognition, material science, nanotechnology, and supramolecular chemistry will welcome this book as an inspiring source for creative research ideas.
Author: Robert Vajtai Publisher: Springer Science & Business Media ISBN: 364220595X Category : Technology & Engineering Languages : en Pages : 1234
Book Description
The Springer Handbook of Nanomaterials covers the description of materials which have dimension on the "nanoscale". The description of the nanomaterials in this Handbook follows the thorough but concise explanation of the synergy of structure, properties, processing and applications of the given material. The Handbook mainly describes materials in their solid phase; exceptions might be e.g. small sized liquid aerosols or gas bubbles in liquids. The materials are organized by their dimensionality. Zero dimensional structures collect clusters, nanoparticles and quantum dots, one dimensional are nanowires and nanotubes, while two dimensional are represented by thin films and surfaces. The chapters in these larger topics are written on a specific materials and dimensionality combination, e.g. ceramic nanowires. Chapters are authored by well-established and well-known scientists of the particular field. They have measurable part of publications and an important role in establishing new knowledge of the particular field.
Author: Klaus D. Sattler Publisher: CRC Press ISBN: 1420075519 Category : Science Languages : en Pages : 782
Book Description
Many bottom-up and top-down techniques for nanomaterial and nanostructure generation have enabled the development of applications in nanoelectronics and nanophotonics. Handbook of Nanophysics: Nanoelectronics and Nanophotonics explores important recent applications of nanophysics in the areas of electronics and photonics. Each peer-reviewed c
Author: Yongfang Li Publisher: Springer ISBN: 3319168622 Category : Technology & Engineering Languages : en Pages : 402
Book Description
This volume reviews the latest trends in organic optoelectronic materials. Each comprehensive chapter allows graduate students and newcomers to the field to grasp the basics, whilst also ensuring that they have the most up-to-date overview of the latest research. Topics include: organic conductors and semiconductors; conducting polymers and conjugated polymer semiconductors, as well as their applications in organic field-effect-transistors; organic light-emitting diodes; and organic photovoltaics and transparent conducting electrodes. The molecular structures, synthesis methods, physicochemical and optoelectronic properties of the organic optoelectronic materials are also introduced and described in detail. The authors also elucidate the structures and working mechanisms of organic optoelectronic devices and outline fundamental scientific problems and future research directions. This volume is invaluable to all those interested in organic optoelectronic materials.
Author: Schinke Janusz Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG ISBN: 9783838151441 Category : Languages : en Pages : 204
Book Description
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.
Author: Aniket Datar
Author: Aniket Datar
Author: Kaushik Balakrishnan
Author: Chaoying Fu
Author: Katsuhiko Ariga
Author: Alex Li Dequan
Author: Makoto Fujita
Author: Robert Vajtai
Author: Klaus D. Sattler
Author: Yongfang Li
Author: Schinke Janusz