Electronic Structure Of Interfacial States Formed At Polymeric Semiconductor Heterojunctions
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Electronic Structure Of Interfacial States Formed At Polymeric Semiconductor Heterojunctions
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Author : Y. S. Huang
language : en
Publisher:
Release Date : 2008
Electronic Structure Of Interfacial States Formed At Polymeric Semiconductor Heterojunctions written by Y. S. Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Electronic Structure Of Metal Semiconductor Contacts
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Author : Winfried Mönch
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Electronic Structure Of Metal Semiconductor Contacts written by Winfried Mönch and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Interface and surface science have been important in the development of semicon ductor physics right from the beginning on. Modern device concepts are not only based on p-n junctions, which are interfaces between regions containing different types of dopants, but take advantage of the electronic properties of semiconductor insulator interfaces, heterojunctions between distinct semiconductors, and metal semiconductor contacts. The latter ones stood almost at the very beginning of semi conductor physics at the end of the last century. The rectifying properties of metal-semiconductor contacts were first described by Braun in 1874. A physically correct explanation of unilateral conduction, as this deviation from Ohm's law was called, could not be given at that time. A prerequisite was Wilson's quantum theory of electronic semi-conductors which he published in 1931. A few years later, in 1938, Schottky finally explained the rectification at metal-semiconductor contacts by a space-
Molecular Orientation And Emission Characteristics Of Ir Complexes And Exciplex In Organic Thin Films
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Author : Chang-Ki Moon
language : en
Publisher: Springer
Release Date : 2019-01-29
Molecular Orientation And Emission Characteristics Of Ir Complexes And Exciplex In Organic Thin Films written by Chang-Ki Moon and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-01-29 with Science categories.
This thesis considers molecular orientation in thin films and introduces an optical model describing this orientation as applied to organic light-emitting diodes (OLEDs). It also describes the electronic structure of intermolecular charge transfer excitons correlated to molecular orientation in solids. It has long been known that molecular orientation influences the electrical and optical properties of molecular films. One notable example is in liquid crystals where rigid rod or disk shaped molecules are commonly used. Understanding the origin of the molecular orientation and its control by surface treatment and electric field resulted in the development of liquid crystal displays. The same thing has happened in organic electronics, and considerable effort has been devoted to understanding and controlling molecular orientation in solid films to improve charge carrier mobility and light absorption, ultimately to improve the performance of organic solar cells and thin film transistors. In contrast, less attention has been paid to molecular orientation and its influence on the characteristics of OLEDs, probably because of the use of amorphous films rather than micro-crystalline films, and it is only in recent years that some molecular films are known to have preferred orientation. This thesis addresses this topic, focusing on OLEDs, describing the origin and control of the orientation of phosphorescent Ir complexes possessing spherical shape rather than rod or disk shape, the simulation of the optical characteristics of OLEDs influenced by preferred molecular orientation, and finally the orientation of intermolecular charge transfer excitons and its correlation to electronic structures in thin films.
Physics Of Organic Semiconductors
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Author : Wolfgang Brütting
language : en
Publisher: John Wiley & Sons
Release Date : 2012-10-02
Physics Of Organic Semiconductors written by Wolfgang Brütting and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-10-02 with Technology & Engineering categories.
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.
Conjugated Polymer And Molecular Interfaces
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Author : William R. Salaneck
language : en
Publisher: CRC Press
Release Date : 2001-10-18
Conjugated Polymer And Molecular Interfaces written by William R. Salaneck and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-10-18 with Science categories.
Defines the state-of-the-art in interface science for electronic applications of organic materials. Updates understanding of the foundaiton of interfacial properties. Describes novel electronic devices created from conjugated polymers and organic molecular solids.
Terahertz Technology And Its Applications
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Author : Victor Pacheco Peña
language : en
Publisher: MDPI
Release Date : 2021-08-31
Terahertz Technology And Its Applications written by Victor Pacheco Peña and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-08-31 with Science categories.
The Terahertz frequency range (0.1 – 10)THz has demonstrated to provide many opportunities in prominent research fields such as high-speed communications, biomedicine, sensing, and imaging. This spectral range, lying between electronics and photonics, has been historically known as “terahertz gap” because of the lack of experimental as well as fabrication technologies. However, many efforts are now being carried out worldwide in order improve technology working at this frequency range. This book represents a mechanism to highlight some of the work being done within this range of the electromagnetic spectrum. The topics covered include non-destructive testing, teraherz imaging and sensing, among others.
Understanding The Morphology At Donor Acceptor Interfaces In Organic Semiconductors
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Author : Zixuan Guo
language : en
Publisher:
Release Date : 2022
Understanding The Morphology At Donor Acceptor Interfaces In Organic Semiconductors written by Zixuan Guo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Organic electronic devices, including organic photovoltaics (OPV), organic light-emitting diodes (OLEDs), and organic field-effect transistors (OFETs), have become increasingly important in consumer electronic applications due to the development of organic semiconductors, including organic small molecules, and conjugated polymers. They have advantages such as light weight, flexibility/stretchability, and the ability for roll-to-roll manufacturing. The structure and mechanism of organic devices are analogous to inorganic semiconductor devices, where donor materials (p-type) and acceptor materials (n-type) are used to create interfaces. To build high-performance organic electronic devices, it is essential to understand functionalities of organic heterojunction because they are building blocks of electronics. Organic heterojunction is interfaces created between donor and acceptor organic semiconductors. Exciting electronic action of devices occurs at organic interfaces. From a fundamental viewpoint, the role of interfaces must have optimal electronic and physical communication to yield highly efficient devices. From a technological viewpoint, one must understand, control, and have a rational design of the desired electronic and optical properties at organic interfaces for the development of different electronics and a host of potential new device concepts that have not yet been developed or realized. In this dissertation, we will use organic semiconductors for organic photovoltaics (OPV) as an example to investigat organic heterojunction interfaces, including interface fabrication, epitaxy, morphology control, and characterization, with the aim of building high-performance devices with good stability. We begin by discussing the growth of organic single-crystalline crystals with controlled orientations. Materials used are two small molecules: zinc phthalocyanine (ZnPc, p-type) and 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA, n-type). In this study, a self-built vertical physical vapor transport (v-PVT) chamber is used for crystallization, and a graphene-coated substrate is used to control molecular packing. Although ZnPc and PTCDA have a planar molecular shape and face-on packing motif on graphene, we find that they have different growth modes. Such growth mechanism difference can be explained by competition between intermolecular and molecule-graphene interactions. We then continue the abovementioned study by building model heterojunctions on graphene substrates using ZnPc and PTCDA. We discover that thermodynamics and kinetics of the system affect P-N junction morphology. We find that ZnPc and PTCDA form the "line-on-line" organic weak epitaxy at heterojunction interfaces from X-ray studies and crystallography refinement. We also verify that P-N junctions can generate electron-hole pairs. This work will advance the knowledge and create enabling opportunities to fabricate single-crystalline-oriented nanostructures. Besides using organic small molecules, we also explore the structure-property-performance relationship of conjugated block copolymers (BCPs) for OPV applications. In this work, a new donor-acceptor BCP is synthesized and added into polymer blend solar cells. We find that adding BCP could potentially retain the relative degree of crystallinity of [pi]-[pi] stacking regions, and decrease the detrimental interaction between donor polymer and electrode under thermal stress, thus improving the solar device's thermal stability by 30%. Finally, we explore the possibility of using graphene engineering for epitaxial growth dynamics control of organic small molecules. We determine that two distinct, alternating morphologies of ZnPc crystals are simultaneously observed on a single epitaxial SiC-graphene substrate. We hypothesize that the different morphologies arise from electronic structure and surface energy differences of underlying SiC-graphene regions ZnPc is grown on. The result will enable selective patterning of organic semiconductors for use in advanced warfare device applications. We hope these studies throughout this work will advance knowledge on fundamental crystallization mechanisms, interface engineering, morphology control, and characterization in organic crystalline systems. This work could further produce various future architectures for different applications in organic electronics.
Semiconductor Heterojunctions
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Author : B. L. Sharma
language : en
Publisher: Pergamon
Release Date : 1974
Semiconductor Heterojunctions written by B. L. Sharma and has been published by Pergamon this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Technology & Engineering categories.
Conjugated Polymers
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Author : Terje A. Skotheim
language : en
Publisher: CRC Press
Release Date : 2006-12-26
Conjugated Polymers written by Terje A. Skotheim and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-12-26 with Technology & Engineering categories.
Many significant fundamental concepts and practical applications have developed since the publication of the best-selling second edition of the Handbook of Conducting Polymers. Now divided into two books, the third edition continues to retain the excellent expertise of the editors and world-renowned contributors while providing superior coverage of
Handbook Of Conducting Polymers 2 Volume Set
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Author : Terje A. Skotheim
language : en
Publisher: CRC Press
Release Date : 2007-01-16
Handbook Of Conducting Polymers 2 Volume Set written by Terje A. Skotheim and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-01-16 with Technology & Engineering categories.
Learn how recent advances are fueling new possibilities in textiles, optics, electronics, and biomedicine! As the field of conjugated, electrically conducting, and electroactive polymers has grown, the Handbook of Conducting Polymers has been there to document and celebrate these changes along the way. Now split into two vo