Electrical and Geometrical Properties of Organic Monolayers PDF Download
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Author: Mitsumasa Iwamoto
Publisher: World Scientific Publishing Company
ISBN: 9789814602976
Category : Science
Languages : en
Pages : 250
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Book Description
This book addresses the physical mechanisms involved in the characteristic electrical properties and the geometrical structures that are observed from dipolar monolayers composed of organic molecules by using dielectric physics, electrostatics, the physics of liquid crystal, and soft matter physics. The orientational order parameters, introduced to quantify the orientational structures of monolayers, guide us towards this goal. Dielectric polarizations are spontaneously generated from monolayers because of their orientational structures, and electrostatic energies due to these dielectric polarizations play a key role in forming the geometrical structures that are observed from monolayers. Free energy minimization is a powerful tool to understand the physical mechanisms that stabilize these geometrical structures because of the soft matter nature of monolayers. The approach makes this book unique among the literatures of monolayers.
Author: Mitsumasa Iwamoto
Publisher: World Scientific Publishing Company
ISBN: 9789814602976
Category : Science
Languages : en
Pages : 250
Get Book Here
Book Description
This book addresses the physical mechanisms involved in the characteristic electrical properties and the geometrical structures that are observed from dipolar monolayers composed of organic molecules by using dielectric physics, electrostatics, the physics of liquid crystal, and soft matter physics. The orientational order parameters, introduced to quantify the orientational structures of monolayers, guide us towards this goal. Dielectric polarizations are spontaneously generated from monolayers because of their orientational structures, and electrostatic energies due to these dielectric polarizations play a key role in forming the geometrical structures that are observed from monolayers. Free energy minimization is a powerful tool to understand the physical mechanisms that stabilize these geometrical structures because of the soft matter nature of monolayers. The approach makes this book unique among the literatures of monolayers.
Author: Mitsumasa Iwamoto
Publisher: World Scientific
ISBN: 9789812810397
Category : Science
Languages : en
Pages : 220
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Book Description
Ch. 5. Dielectric relaxation phenomena. 5.1. Rotational Debye Brownian motion model. 5.2. Relaxation process at an air-water interface. 5.3. Determination of dielectric relaxation time. 5.4. Summary. References -- ch. 6. Chiral phase separation. 6.1. Elastic energy and Bragg-Williams mixing energy. 6.2. Chiral phase separation. 6.3. Discrete one-dimensional CPS solution. 6.4. Summary. 6.5. Appendix. References -- ch. 7. Nonlinear effects. 7.1. SOS in orientational order parameters for C[symbol] monolayers. 7.2. Chirality representation. 7.3. SHG-CD effect. 7.4. SHG-MDC measuring system. 7.5. Quantum mechanical analysis of photoisomerization. 7.6. Summary. References -- ch. 8. Thermally-stimulated current. 8.1. Thermally-stimulated current. 8.2. Depolarization due to thermal stimulation. 8.3. TSC experiment. 8.4. Phase transition. 8.5. Thermodynamics approach to monolayers. 8.6. Summary. References -- ch. 9. Electronic properties at MIM interfaces. 9.1. Tunneling current and electronic device applications. 9.2. Nanometric interfacial electrostatic phenomena in ultrathin films. 9.3. I-V characteristic. 9.4. Summary. References.
Author: Florent Martin
Publisher:
ISBN:
Category :
Languages : en
Pages : 268
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Book Description
Correlating structural and electrical properties of organic thin films is a key requirement to understand charge transport in these materials. The electrical conductivity of organic films should be strongly dependent on how the molecules arrange to form films and crystals. Here we report on the structural and electrical characterization of organic monolayers by Atomic Force Microscopy and through the nano-fabrication of a coplanar electrode-dielectric platform. Organic monolayers were prepared using the solution-based Langmuir-Blodgett technique and transferred to a variety of substrates. Atomic Force Microscopy (AFM) was used to analyze the morphology and the microstructure of ultra-thin films at high resolution while electron diffraction measurements were instrumental in determining the lattice and orientation of crystalline domains within monolayers. A novel Conducting probe AFM method based on the presence of an insulating oxide layer between an organic film and a conductive silicon substrate made it possible to probe the in-plane electrical conductivity in the film. With this technique, we were able to investigate the correlation between conduction properties of oligothiophene monolayers and structural factors such as their molecular order and their lattice orientation. In order to make electrical contacts with monolayer films and study them in a Field Effect Transistor (FET) configuration, we developed coplanar electrode-dielectric substrates with roughness and surface topography in the sub-nanometer range. We present the first results on the electrical characterization of monolayers with this device which demonstrate that the coplanar geometry leads to a contact resistance by orders of magnitude lower than that found in conventional 20nm thick electrodes.
Author: Mitsumasa Iwamoto
Publisher: World Scientific
ISBN: 9814492000
Category : Science
Languages : en
Pages : 217
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Book Description
This book provides a fundamental physical picture of various phenomena occurring in organic monolayers, dealing with dielectric, elastic, and electronic properties. The dielectric properties are discussed in terms of orientational order parameters, which are used to interpret the dielectric spectrum observed through Maxwell displacement current measurement and optical second harmonic generation measurement. The elastic theory of organic monolayers is based on that of liquid crystals and emphasis is placed on the interfacial effect when discussing the electronic properties of organic monolayers. The discussion in the book mainly concerns the structure dependence (dipole moment) and thickness dependence (interfacial effect) for various phenomena occurring in organic monolayers.
Author: Yekaterina Leonidovna Lyubarskaya
Publisher:
ISBN:
Category :
Languages : en
Pages : 178
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Book Description
"The research presented in this dissertation focuses on the study of self-assembled monolayers (SAMs) in the modification of surface properties of different substrates for various applications. Self-assembled monolayers are organic molecules that can be deposited on a variety of surfaces, such as those of metals, metal-oxides, and semiconductors. Formation of SAMs on any inorganic material provides a ubiquitous way to impart desirable chemical and physical properties of organic and biological molecules to the inorganic substrate. It has been demonstrated that single molecules and their self-assembled monolayers can significantly alter the physical and electronic properties of inorganic conductors; moreover, studies have shown that the performance of many electrical devices can be transformed by modifying inorganic electrodes with organic SAMs. This is especially important for the development of next generation of ultra-compact electronic devices, in which the ability to control the interfacial charge-transport with a single monolayer of organic molecules would be ideal. We have developed different organic electronic architectures as test beds for studying the effect of monolayer properties, such as structural and geometrical parameters, on their electronic properties. By using a typical organic electronic device as a sensitive test platform, slight changes in a monolayer property, such as length, have been detected by studying the current- voltage characteristics (JV) of organic diodes functionalized with self-assembled monolayers (SAMs) of varying alkyl chain-length. Next, we describe the application of SAMs based on n-octylphosphonic acid (C8PA) and 1H,1H,2H,2H-perfluorooctanephosphonic acid (PFOPA) as anode buffer layers in C60-based organic photovoltaic (OPV) devices. We used the OPV platform to compare stabilities of organic monolayers exposed to ambient conditions with SAMs positioned inside working OPV devices. We found that the stabilities are different, suggesting the degradation mechanisms are distinct. The degradation of the OPV efficiency with respect to air exposure was significantly reduced with the perfluorinated PFOPA compared to the aliphatic C8PA. We attributed the OPV degradation to moisture diffusion from the top aluminum electrode and we discuss that the lowering of the anode work function is the result of hydrolysis of the SAM buffer layer. Next, we demonstrated the dependence of molecular electronic properties on the functional group substitution and that the changes in these properties can be measured using the organic light-emitting (OLED) platform. Specifically, we compared bilayered organic monomolecular systems immobilized on an inorganic electrode as the charge-injecting components of the organic light emitting diodes (OLEDs). Our bilayered interfaces comprise ordered inert primary and functional reactive layers, and they differ in only one parameter: the molecular structure of the terminal functional group. We demonstrate that we can visualize the differences in the charge transfer dynamics of two bilayered systems via patterned electroluminescence. In addition, we describe a new protocol for the preparation of shape-controlled multicomponent particles comprising metallic (Au and Ti), magnetic (Ni), and oxide (SiO2, TiO2) layers. First, we discuss the application and attractiveness of the colloidal structures, Janus Particles (JPs), that possess two different surfaces, varying either in polarity, hydrophilicity, etc. Next, we present our method for specifically controlling the composition, shape, and size of the micro-JPs. We demonstrate how this protocol permits fabrication of non-symmetrical particles by orthogonally functionalizing their opposite sides using well-established organosilanes and thiol chemistries (based on SAMs). We propose that these colloids may be used as convenient materials for studying non-symmetrical self-assembly at the meso- and micro-scales, due to their unique geometries and surface chemistries"--Pages viii-x.
Author: Mitsumasa Iwamoto
Publisher: World Scientific
ISBN: 9811236968
Category : Science
Languages : en
Pages : 511
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Book Description
The probing and modeling of carrier transport in materials is a fundamental research subject in electronics and materials science. According to the Maxwell electromagnetic field theory, there are two kinds of currents, i.e., conduction current and Maxwell displacement current (MDC). The conduction current flows when electronic charges, e.g., electrons and holes, are conveyed in solids, whereas MDC is the transient current that is generated due to the change of electric flux density. The source of conductive current is charged particles, i.e., electrons, holes, ions, etc., and the source of MDC is also the charged particles. It is therefore anticipated that we can probe and model carrier transport in materials, in terms of 'MDC'. In other words, we can find a novel way for modeling and analyzing materials on the basis of Dielectric Physics Approach, on focusing dielectric polarization phenomena. Maxwell Displacement Current and Optical Second-Harmonic Generation are basically dielectric phenomena. The aim of this book is to show the dielectric physics approach for the study of molecular materials and organic electronics devices related to carrier transport and dielectric polarization, on focusing Maxwell Displacement Current and Optical Second-Harmonic Generation in Organic Materials from viewpoints of Analysis and Application for Organic Electronics.
Author: Ryan Charles Major
Publisher:
ISBN:
Category :
Languages : en
Pages : 308
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Book Description
Author: Florent Martin
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Book Description
Author: Hari Singh Nalwa
Publisher: Gulf Professional Publishing
ISBN: 0080542115
Category : Technology & Engineering
Languages : en
Pages : 995
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Book Description
In the last decade, much progress has been made in these materials. This book presents a highly coherent coverage of supramolecular, photosensitive and electroactive materials, namely those that have been extensively investigated for applications in fields of electronic and photonic technologies. This extensive reference provides broad coverage of on different types of materials, their processing, spectroscopic characterization, physical properties and device applications.The implications reach from molecular recognition in synthetic and natural complexes to exciting new applications in chemical technologies, materials, nanostructures, functional materials, new generation catalysts, signal transducers, medical and biomedical applications and novel separation techniques. All these applications rely on supramolecular properties such as molecular recognition, molecular information, and tailored molecular assemblies.This book is aimed to present a highly coherent coverage of supramolecular, photosenstive and electroactive materials and their applications in electronic and photonic technologies. The research behind these materials constitute some of the most actively pursued fields of science.Key Features* Covers supramolecular photosensitive and electroactive materials* Provides recent developments on metallophthalocyanines and polydiacetylenes* Include various types of supramolecular materials, their processing, fabrication, physical properties and device applications* Role of polyimides in microelectronic and tribology* Describes Photosynthetic and respiratory proteins, Dendrimers* A very special topic presented in a timely manner and in a format
Author: Wolfgang Brütting
Publisher: John Wiley & Sons
ISBN: 3527654968
Category : Technology & Engineering
Languages : en
Pages : 660
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Book Description
The field of organic electronics has seen a steady growth over the last 15 years. At the same time, our scientific understanding of how to achieve optimum device performance has grown, and this book gives an overview of our present-day knowledge of the physics behind organic semiconductor devices. Based on the very successful first edition, the editors have invited top scientists from the US, Japan, and Europe to include the developments from recent years, covering such fundamental issues as: - growth and characterization of thin films of organic semiconductors, - charge transport and photophysical properties of the materials as well as their electronic structure at interfaces, and - analysis and modeling of devices like organic light-emitting diodes or organic lasers. The result is an overview of the field for both readers with basic knowledge and for an application-oriented audience. It thus bridges the gap between textbook knowledge largely based on crystalline molecular solids and those books focusing more on device applications.
