Download or read book Spectroscopic and Electrochemical Characterization of Organic Conjugated Polymers for Light emitting Display and Photovoltaic Applications written by Melissa Ann Kreger and published by . This book was released on 2001 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Conjugated Polymer Nanostructures for Energy Conversion and Storage Applications written by Srabanti Ghosh and published by John Wiley & Sons. This book was released on 2021-06-01 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: A timely overview of fundamental and advanced topics of conjugated polymer nanostructures Conjugated Polymer Nanostructures for Energy Conversion and Storage Applications is a comprehensive reference on conjugated polymers for energy applications. Distinguished academic and editor Srabanti Ghosh offers readers a broad overview of the synthesis, characterization, and energy-related applications of nanostructures based on conjugated polymers. The book includes novel approaches and presents an interdisciplinary perspective rooted in the interfacing of polymer and synthetic chemistry, materials science, organic chemistry, and analytical chemistry. This book provides complete descriptions of conjugated polymer nanostructures and polymer-based hybrid materials for energy conversion, water splitting, and the degradation of organic pollutants. Photovoltaics, solar cells, and energy storage devices such as supercapacitors, lithium ion battery electrodes, and their associated technologies are discussed, as well. Conjugated Polymer Nanostructures for Energy Conversion and Storage Applications covers both the fundamental topics and the most recent advances in this rapidly developing area, including: The design and characterization of conjugated polymer nanostructures, including the template-free and chemical synthesis of polymer nanostructures Conjugated polymer nanostructures for solar energy conversion and environmental protection, including the use of conjugated polymer-based nanocomposites as photocatalysts Conjugated polymer nanostructures for energy storage, including the use of nanocomposites as electrode materials The presentation of different and novel methods of utilizing conjugated polymer nanostructures for energy applications Perfect for materials scientists, polymer chemists, and physical chemists, Conjugated Polymer Nanostructures for Energy Conversion and Storage Applications also belongs on the bookshelves of organic chemists and any other practicing researchers, academics, or professionals whose work touches on these highly versatile and useful structures.

Download or read book Conjugated Polymer Electrochromic and Light emitting Devices written by Aubrey L. Dyer and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Chemistry Conjugated conducting polymers are among some of the most versatile materials to emerge in the past 20 years. They have been researched for applications that range from photovoltaics, to light-emitting diodes, electrochromic windows, actuators, and field effect transistors. This work details the analytical characterization of [pi]-conjugated polymers to understand their redox and optical properties, along with the development of several new types of devices that employ these polymers as the active materials for both variable optical attenuators and as dual electrochromic/electroluminescent displays. Within this work, a phenomenon that we term unsymmetrical switching has been uncovered for the first time in reflective electrochromic cells. The unsymmetrical switching in these displays is explored and a model devised to illustrate that the presence of a conductive front propagating through the polymer film on electrochemical oxidation is the contributing cause for this observation. For these experiments, a variety of analytical techniques have been utilized to characterize the devices and materials contained therein and include electrochemistry, spectroelectrochemistry, and photometry.

Download or read book Polymers for Light emitting Devices and Displays written by Inamuddin and published by John Wiley & Sons. This book was released on 2020-05-27 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers for Light-Emitting Devices and Displays provides an in-depth overview of fabrication methods and unique properties of polymeric semiconductors, and their potential applications for LEDs including organic electronics, displays, and optoelectronics. Some of the chapter subjects include: • The newest polymeric materials and processes beyond the classical structure of PLED • Conjugated polymers and their application in the light-emitting diodes (OLEDs & PLEDs) as optoelectronic devices. • The novel work carried out on electrospun nanofibers used for LEDs. • The roles of diversified architectures, layers, components, and their structural modifications in determining efficiencies and parameters of PLEDs as high-performance devices. • Polymer liquid crystal devices (PLCs), their synthesis, and applications in various liquid crystal devices (LCs) and displays. • Reviews the state-of-art of materials and technologies to manufacture hybrid white light-emitting diodes based on inorganic light sources and organic wavelength converters.

Download or read book Conjugated Polymer Surfaces and Interfaces written by W. R. Salaneck and published by Cambridge University Press. This book was released on 2003-10-30 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the basic physics and materials science of conjugated polymers and their interfaces.

Download or read book Electrical and Optical Properties of Multilayered and Blended PPV and PF based Polymer LEDs written by Eric R. Jones and published by . This book was released on 2003 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Conjugated Polymer Nanostructures for Energy Conversion and Storage Applications written by Srabanti Ghosh and published by John Wiley & Sons. This book was released on 2021-03-16 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: A timely overview of fundamental and advanced topics of conjugated polymer nanostructures Conjugated Polymer Nanostructures for Energy Conversion and Storage Applications is a comprehensive reference on conjugated polymers for energy applications. Distinguished academic and editor Srabanti Ghosh offers readers a broad overview of the synthesis, characterization, and energy-related applications of nanostructures based on conjugated polymers. The book includes novel approaches and presents an interdisciplinary perspective rooted in the interfacing of polymer and synthetic chemistry, materials science, organic chemistry, and analytical chemistry. This book provides complete descriptions of conjugated polymer nanostructures and polymer-based hybrid materials for energy conversion, water splitting, and the degradation of organic pollutants. Photovoltaics, solar cells, and energy storage devices such as supercapacitors, lithium ion battery electrodes, and their associated technologies are discussed, as well. Conjugated Polymer Nanostructures for Energy Conversion and Storage Applications covers both the fundamental topics and the most recent advances in this rapidly developing area, including: The design and characterization of conjugated polymer nanostructures, including the template-free and chemical synthesis of polymer nanostructures Conjugated polymer nanostructures for solar energy conversion and environmental protection, including the use of conjugated polymer-based nanocomposites as photocatalysts Conjugated polymer nanostructures for energy storage, including the use of nanocomposites as electrode materials The presentation of different and novel methods of utilizing conjugated polymer nanostructures for energy applications Perfect for materials scientists, polymer chemists, and physical chemists, Conjugated Polymer Nanostructures for Energy Conversion and Storage Applications also belongs on the bookshelves of organic chemists and any other practicing researchers, academics, or professionals whose work touches on these highly versatile and useful structures.

Download or read book Handbook of Thiophene Based Materials written by Igor F. Perepichka and published by Wiley. This book was released on 2009-07-17 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt: This essential resource consists of a series of critical reviews written by leading scientists, summarising the progress in the field of conjugated thiophene materials. It is an application-oriented book, giving a chemists’ point of view on the state-of-art and perspectives of the field. While presenting a comprehensive coverage of thiophene-based materials and related applications, the aim is to show how the rational molecular design of materials can bring a new breadth to known device applications or even aid the development of novel application concepts. The main topics covered include synthetic methodologies to thiophene-based materials (including the chemistry of thiophene, preparation of oligomers and polymerisation approaches) and the structure and physical properties of oligo- and polythiophenes (discussion of structural effects on electronic and optical properties). Part of the book is devoted to the optical and semiconducting properties of conjugated thiophene materials for electronics and photonics, and the role of thiophene-based materials in nanotechnology.

Download or read book Synthesis and Characterization of Novel Conjugated Polymers and Small Molecules for Photovoltaic Applications written by Robert James Thompson and published by . This book was released on 2017 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes the synthesis and characterization of several novel conjugated polymers and small molecules for use in research on organic photovoltaics (i.e. polymer solar cells/organic solar cells). Chapter 1 is an introductory chapter that briefly introduces semiconducting polymers and gives a brief overview of their use in polymer solar cells. Chapter 2 describes the synthesis and characterization of the conjugated polyelectrolyte, poly{(4,4-bis(3'-(N-ethyl-N,N-dimethylammonio)propyl)cyclopenta[2,1-b:3,4-b']dithiophene)-2,6-diyl-alt-(thiophene-2,5-diyl)} bromide (PCT). Chapter 3 describes the synthesis and characterization of a series of conjugated polymers containing substituted dithieno[3,2-a:2',3'-c]phenazine monomer units, and also describes the fabrication and analysis of solar cells devices made from these materials. Chapter 4 describes the synthesis and characterization of a series of conjugated polymers and small molecules based on the condensation of various aromatic o-diamines with o-diketones to produce novel N-heteroacenes. Chapter 5 gives a brief review of the work reported in this dissertation and provides suggestions for future work that can be built on those findings.

Download or read book Characterization of Polymer Blends written by Sabu Thomas and published by John Wiley & Sons. This book was released on 2014-10-28 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling the gap for a reference dedicated to the characterization of polymer blends and their micro and nano morphologies, this book provides comprehensive, systematic coverage in a one-stop, two-volume resource for all those working in the field. Leading researchers from industry and academia, as well as from government and private research institutions around the world summarize recent technical advances in chapters devoted to their individual contributions. In so doing, they examine a wide range of modern characterization techniques, from microscopy and spectroscopy to diffraction, thermal analysis, rheology, mechanical measurements and chromatography. These methods are compared with each other to assist in determining the best solution for both fundamental and applied problems, paying attention to the characterization of nanoscale miscibility and interfaces, both in blends involving copolymers and in immiscible blends. The thermodynamics, miscibility, phase separation, morphology and interfaces in polymer blends are also discussed in light of new insights involving the nanoscopic scale. Finally, the authors detail the processing-morphology-property relationships of polymer blends, as well as the influence of processing on the generation of micro and nano morphologies, and the dependence of these morphologies on the properties of blends. Hot topics such as compatibilization through nanoparticles, miscibility of new biopolymers and nanoscale investigations of interfaces in blends are also addressed. With its application-oriented approach, handpicked selection of topics and expert contributors, this is an outstanding survey for anyone involved in the field of polymer blends for advanced technologies.

Download or read book Synthesis and Characterization of Conjugated Polymers and Small Molecules for Organic Photovoltaic Devices written by Obum Kwon and published by . This book was released on 2013 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar energy harvested directly from sunlight using photovoltaic (PV) technology has become one of the most promising ways to meet growing global energy needs with a sustainable resource while minimizing environmental concerns. Especially, organic bulk heterojunction (BHJ) solar cells have been attracting a great deal of interest as a source of renewable energy because of their potential as low-cost, flexible, light-weight and large-scale devices. The choice of materials in a BHJ solar cell is very important for device performance because the power conversion efficiencies (PCEs) are determined by their some crucial characteristics such as energy levels, charge transfer mobilities and structural orders. In this dissertation, two carbazole-diketopyrrolopyrrole based conjugated polymers (P1 and P2) and three thieno-[3,4-c]pyrrole-4,6-dione (TPD) based small molecules (M1, SM1 and SM2) were synthesized and characterized to investigate their optical, electrical and photovoltaic properties. First, the substitution of alkyl and aryl side chains on the carbazole moiety of two push-pull conjugated polymers (P1 and P2) shows the significant differences in the optical, electrical and photovoltaic properties. Second, TPD-based conjugated small molecule with a donor-acceptor-donor-acceptor-donor (D-A-D-A-D) framework, M1 shows the relatively deep HOMO level resulting the relatively high Voc.(0.85 eV) Small molecule BHJ solar cells were fabricated and characterized using different M1:PC71BM blend ratios, solvents, and additives and the highest PCE achieved in this study was 1.86%. Lastly, different bridgehead atoms of SM1 and SM2 can affect their energy band levels and device performances. The PCE (2.5%) of the SM2-based SM-BHJ solar cell was higher than that of the SM1-based SM-BHJ solar cell (1.5%).

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Primary Photoexcitations in Conjugated Polymers written by Niyazi Serdar Sariciftci and published by World Scientific Publishing Company Incorporated. This book was released on 1997-01-01 with total page 621 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spectroscopic Characterization of Interfacial Charge Transfer and Recombination in Polymer quantum Dot Blends written by Adam E. Colbert and published by . This book was released on 2016 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considerable research interest in solution-processed semiconductors, including conjugated polymers and colloidal quantum dots, has been primarily motivated by the desire to produce optoelectronic devices using low-cost fabrication methods. Realization of this goal requires both improvements in material properties, and an extensive understanding of the factors regulating device operation and efficiency. This thesis is concerned with spectroscopically probing the fundamental mechanisms of photoinduced interfacial charge transfer in polymer/quantum dot composites, and exploring the role of quantum dot surface chemistry in governing the electronic properties photovoltaic devices. Specifically, we study blends of conjugated polymers with low band gap PbS quantum dots with applications to solar cells and photodetectors. Quantum dot surface ligands play an important role in mediating the spatial and electronic barrier for charge transfer at the donor/acceptor interface in bulk heterojunction polymer/quantum dot blends. The first part of this thesis explores the effects of postdeposition ligand exchange on the device performance and electronic properties of conjugated polymer composites with PbS quantum dots. We tested a series of ligand exchanges with small bidentate organic molecules, and inorganic iodide ions, and determined that the different treatments influence device performance mainly through changes in open-circuit voltage and fill factor. We found that treatment with 3-mercaptopropionic acid (MPA) yields the highest device efficiencies, and iodide treatment gives the lowest efficiencies. Photoinduced absorption (PIA) experiments showed that MPA treatment results in both greater long-lived polaron populations and longer average polaron lifetimes. We further employed transient photovoltage (TPV) and charge extraction (CE) techniques on solar cell devices to determine that MPA treatment yields greater open-circuit voltages and higher charge carrier densities by promoting longer carrier recombination lifetimes compared to the other ligand treatments. We speculate that these observations are due to differences in carrier mobility and lifetime, in addition to changes in quantum dot energy level alignment relative to the polymer with the different ligands. Interfacial charge transfer between donor and acceptor materials is a fundamental process for the operation of bulk heterojunction solar cells. The second part of this thesis provides verification of a hole transfer mechanism from photoexcited QDs to the organic host polymer in polymer/quantum dot blends. We used PIA spectroscopy to show that selective excitation of the PbS quantum dot species results in the formation of long-lived charges (polarons) on the polymer chains due to the transfer of photoexcited holes. We also showed that higher photon-energy excitation of both polymer and quantum dot components produces greater charge transfer yields compared to selective excitation of the quantum dots with lower photon-energy. We hypothesized that either electron transfer is more efficient than hole transfer, or that hole transfer efficiency is wavelength-dependent, suggesting that the excess energy of "hot" (nonthermalized) excitations facilitates hole transfer to the polymer. Building on these results, we used transient absorption (TA) spectroscopy to investigate the role of pump photon-energy on hole transfer rates in polymer/PbS quantum dot blends through selective excitation of the quantum dot component at two different wavelengths. We showed that higher photon-energy excitation of the blends produces a significantly greater prompt hole transfer yield compared to lower photon-energy excitation, on timescales consistent with carrier cooling rates in the quantum dots. This result provides direct evidence to support the hypothesis that the excess energy of hot carriers in the quantum dots, resulting from excitation with higher photon-energy, facilitates hole transfer to the polymer on subpicosecond timescales. Furthermore, we demonstrate that relaxed carriers on the quantum dots can also transfer to the polymer, at slower rates and with reduced efficiency.

Download or read book Ultrafast Photophysics of Pi conjugated Polymers for Organic Light Emitting Diode Applications written by Ella Olejnik and published by . This book was released on 2013 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Organoboron Functionalized Conjugated Polymers written by Haiyan Li and published by . This book was released on 2010 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thiophene- and fluorene-based polymers represent two important classes of semiconducting materials and their applications in organic light emitting devices, photovoltaics, organic field-effect transistors and chemical sensors have been extensively investigated. Electron-deficient organoboranes provide interesting characteristics including their ability to act as efficient emitters and charge transport materials in optoelectronic devices and as sensory element for nucleophiles. It is desirable to bring together these two classes of building blocks within one system to form a variety of materials with advantageous properties. We have explored two alternative design principles: (i) the embedding of boron into the conjugated polymer main chain and (ii) the direct attachment of boron as a side group to the conjugated polymer backbone. Three different projects were pursued in this general area: 1. The reactive polymer scaffold poly(fluorenylene(bromo)borane) (PFBBr) with alternating fluorene and borane moieties was prepared via B-Sn exchange reaction. Starting from PFBBr as a universal precursor, we obtained a series of polymers for which we can tune the stability, thermal characteristics, and fluorescence behavior by simple post-polymerization modification reactions. By using the same synthetic strategy, we have also prepared a main chain donor-acceptor type polymer based on a combination of fluorene and triphenylamine. As expected for an ambipolar system, this polymer exhibits a remarkable solvatochromic effect in the emission and can be oxidized and reduced electrochemically at moderate potentials. 2. In an alternative approach, a series of polythiophenes with diarylboryl functional groups attached at the lateral positions have been developed in our group by Anand Sundararaman via a post-polymerization borylation route. The electrical and structural properties of the polymer and the chemical stability can be further tuned by variation of the aryl groups on boron, for which the redox active ferrocenyl and sterically bulky Mes or Tip groups were introduced. To further investigate how the main chain chemical structure influences the optoelectronic properties of this type of polymers, we have prepared a class of bis(dimesitylboryl)bithiophene-based alternating copolymers, involving different aromatic systems such as fluorene, carbazole and triphenylamine derivatives. 3. Organoboron quinolate chelates are promising as light emitting materials because of their high thermal stability and efficient luminescence. We have prepared two new polymers with both the quinolate ligands and boron centers embedded in the main chain. The polymers were obtained by a simple one-step procedure that involves metal-free boron-induced ether cleavage reactions. All the polymers have been characterized by multinuclear NMR spectroscopy, gel permeation chromatography (GPC) and their thermal behavior has been studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Their photophysical and electrochemical properties and electronic structures have been investigated by UV-vis absorption and fluorescence spectroscopy, cyclic voltammetry and theoretical calculations for the respective model systems. The tri-coordinate organoboron compounds that were prepared are promising sensory materials and their response towards different anions has been evaluated by UV-vis absorption and fluorescence spectroscopy.

Download or read book Novel Semiconducting Polymers written by Emir Hubijar and published by . This book was released on 2013 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 1 provides general information on conjugated polymers utilized in polymer light-emitting diodes (LEDs), polymer solar cells (PSCs) and organic field effect transistors (OFETs). It also includes brief description and schematic diagrams for each device configuration.