Investigations of the Optical and Electronic Properties of Crystalline Organic Semiconductors PDF Download
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Author:
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Category :
Languages : en
Pages : 3
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Book Description
During the course of this program, major advances have been made in our understanding of the growth and optical properties of organic nanostructures. For example, we have found that a clear indication of quasi-epitaxial growth of an organic molecule is failure of the epitaxial layer to reduce strain by the generation of defects as films thickness is increased. Furthermore, studies of the optical spectra of closely packed molecules such as PTCDA indicate that organic nanostructures (such as multiple quantum wells) can be used to change the electronic and optical properties of organic materials in much the same manner as in inorganic semiconductors. Further, we have demonstrated high efficiency organic light emitting devices, as well as the invented the process of organic vapor phase deposition (OVPD) for achieving ordered growth of organic salts for nonlinear optics applications.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 3
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Book Description
During the course of this program, major advances have been made in our understanding of the growth and optical properties of organic nanostructures. For example, we have found that a clear indication of quasi-epitaxial growth of an organic molecule is failure of the epitaxial layer to reduce strain by the generation of defects as films thickness is increased. Furthermore, studies of the optical spectra of closely packed molecules such as PTCDA indicate that organic nanostructures (such as multiple quantum wells) can be used to change the electronic and optical properties of organic materials in much the same manner as in inorganic semiconductors. Further, we have demonstrated high efficiency organic light emitting devices, as well as the invented the process of organic vapor phase deposition (OVPD) for achieving ordered growth of organic salts for nonlinear optics applications.
Author: Stephen R. Forrest
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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Book Description
A theory regarding transport of charge across crystalline molecular organic semiconductor/inorganic semiconductor heterojunctions is developed. It is found that transport under reverse bias, and under low forward bias is determined by carrier diffusion through the organic layer, and by thermionic emission across the heterojunction energy band discontinuity. Using the results of this theory, the valence band discontinuity energy between 3,4,9,10 perylenetetracarboxylic dianhydride and p-Si is directly measured using energy barrier photoemission spectroscopy and the analysis of the temperature dependence of the current-voltage data for this materials system. Apparently, this represents the first measurement of the band offsets between a molecular semiconductor and an inorganic semiconductor, and indicates the existence of relatively trap free heterointerfaces with many potential optical and electrical device applications. Additionally, an organic MBE system is described. Keywords: Heterojunction; Molecular semiconductor; Organic semiconductor. (mgm).
Author: Robert Nitsche
Publisher:
ISBN: 9783865378552
Category :
Languages : en
Pages : 169
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Book Description
Author: Brian H. Johnson
Publisher:
ISBN:
Category : Organic semiconductors
Languages : en
Pages : 134
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Book Description
The continued development of organic semiconductor materials relies on an understanding of the relationship between optoelectronic properties, molecular structure, and molecular interaction. Several detailed studies of electronic properties in functionalized polyacene materials are presented. A computational model which allows the extraction of charge generation and transport properties from experimental data is developed. Ultrafast charge generation is observed, and the dependence of transient photocurrent data on this charge generation is determined. Greater crystallinitity of the donor leads to more efficient ultrafast charge generation, improving device performance. Voltage and incident intensity dependence data is fit using a single parameter set, allowing for the testing of multiple theoretical models against each other. The effect of acceptor addition to the donor material is investigated. Different acceptors allow for the isolation of effects due to packing and electronic structure interactions with the donor. New sources for organic materials to test are important to the future of the field. One novel source for organic small molecules is the secretions of wood-eating fungi. Optical and electronic characterisation is performed on xylindein, a fungally-derived molecule, as an example of the interesting properties and challenges which this source of material present.
Author: Hisao Ishii
Publisher: Springer
ISBN: 4431552065
Category : Science
Languages : en
Pages : 427
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Book Description
The book covers a variety of studies of organic semiconductors, from fundamental electronic states to device applications, including theoretical studies. Furthermore, innovative experimental techniques, e.g., ultrahigh sensitivity photoelectron spectroscopy, photoelectron yield spectroscopy, spin-resolved scanning tunneling microscopy (STM), and a material processing method with optical-vortex and polarization-vortex lasers, are introduced. As this book is intended to serve as a textbook for a graduate level course or as reference material for researchers in organic electronics and nanoscience from electronic states, fundamental science that is necessary to understand the research is described. It does not duplicate the books already written on organic electronics, but focuses mainly on electronic properties that arise from the nature of organic semiconductors (molecular solids). The new experimental methods introduced in this book are applicable to various materials (e.g., metals, inorganic and organic materials). Thus the book is also useful for experts working in physics, chemistry, and related engineering and industrial fields.
Author: Sadao Adachi
Publisher: Springer Science & Business Media
ISBN: 1461552419
Category : Technology & Engineering
Languages : en
Pages : 272
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Book Description
Optical Properties of Crystalline and Amorphous Semiconductors: Materials and Fundamental Principles presents an introduction to the fundamental optical properties of semiconductors. This book presents tutorial articles in the categories of materials and fundamental principles (Chapter 1), optical properties in the reststrahlen region (Chapter 2), those in the interband transition region (Chapters 3 and 4) and at or below the fundamental absorption edge (Chapter 5). Optical Properties of Crystalline and Amorphous Semiconductors: Materials and Fundamental Principles is presented in a form which could serve to teach the underlying concepts of semiconductor optical properties and their implementation. This book is an invaluable resource for device engineers, solid-state physicists, material scientists and students specializing in the fields of semiconductor physics and device engineering.
Author: Yongfang Li
Publisher: Springer
ISBN: 3319168622
Category : Technology & Engineering
Languages : en
Pages : 402
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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:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 804
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Horst-Günter Rubahn
Publisher: Springer Science & Business Media
ISBN: 3540959300
Category : Technology & Engineering
Languages : en
Pages : 208
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Book Description
Organic semiconductors are a central topic of advanced materials research. The book is aiming at bridging the gap between the development and production of devices and basic research on thin film characterisation using cutting-edge techniques in surface and interface science. Topics involve organic molecular-based sensors; interfaces in organic diodes and transistors; mobility in organic field effect transistors and space charge problems; integration of optoelectronic nanostructures; nonlinear optical properties of organic nanostructures; the wetting layer problem; how to get from functionalized molecules to nanoaggregates; optical, electrical and mechanical properties of organic nanofibers as well; as near field investigations of organic thin films.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 103
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Book Description
A new class of engineered materials based on crystalline organic semiconductors grown by the ultrahigh vacuum process of organic molecular beam deposition is described. The objective of this program is to investigate these materials and the conditions which lead to ordered growth between highly lattice mismatched van der Waals crystals into novel 'quasi-epitaxial' structures. During the first year of the program, considerable progress has been made in understanding and exploiting this new class of materials. In particular, a simple model has been developed which describes the physical mechanisms underlying quasi-epitaxy. The electrical and optical properties of both single and multiple heterojunction structures grown using alternating layers of two different, lattice-mismatched organic molecules have been investigated in detail. It is found that the layers can be grown sufficiently thin (10 A) to result in exciton confinement in organic multiple quantum wells. These and other quasi-epitaxially grown structures can load to an entirely new family of optoelectronic devices with exciting new electronic and nonlinear optical characteristics.
