Tailoring Perovskite Functionality with Fluoridation Topochemistry PDF Download
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Author: Benjamin M. Lefler
Publisher:
ISBN:
Category : Fluoropolymers
Languages : en
Pages : 0
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Book Description
Topochemistry is the chemical modification of a material while preserving its crystalline integrity. In instances where bottom-up synthesis of a complex material may be difficult or impossible to control, topochemistry offers a precise route of engineering properties through post-synthesis treatment. My work applies fluoridation topochemistry to perovskite materials for spatial chemical and physical property modifications. Perovskite oxides - with the formula ABO3 in which A tends to be an alkali, alkaline earth, or rare earth metal, and B tends to be a transition or post-transition metal - offer a wide variety of tunable optoelectronic and magnetic properties. Lateral patterning of these properties can enable new architectures in oxide-based electronic, magnetic memory, spintronic, and ionic devices. I laterally pattern such properties in perovskite film SrFeO3-[delta] by combining photolithography with reduction/oxidation and fluoridation topochemistries to fabricate laterally-heterostructured films of SrFeO3, reduced SrFeO2.5, and fluoridated phase SrFeO2F. I also demonstrate that the chemical stability of SrFeO2F enables dynamically-control patterned properties through selective reversible redox chemistry of oxide phases. In a second, related yet quite different materials class, the hybrid organic/inorganic lead halide perovskites, I demonstrate that fluoridation topochemistry exerts strong influence over the dynamics of photoinduced charge carriers, with significant implications for photovoltaic devices. Issues in these materials arise from the weak bonding at crystalline surfaces and interfaces. I test the hypothesis that topochemically applied fluoride, selectively added at the surface of hybrid perovskite thin films improves surface chemistry through strong bonding. Under optimized conditions, fluoridation improves the photoinduced charge carrier lifetimes by three-fold. Meanwhile, "overfluoridation" leads to the generation of PbF2 which is identified herein to act as an electron-acceptor for the conduction band of the perovskite.
Author: Benjamin M. Lefler
Publisher:
ISBN:
Category : Fluoropolymers
Languages : en
Pages : 0
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Book Description
Topochemistry is the chemical modification of a material while preserving its crystalline integrity. In instances where bottom-up synthesis of a complex material may be difficult or impossible to control, topochemistry offers a precise route of engineering properties through post-synthesis treatment. My work applies fluoridation topochemistry to perovskite materials for spatial chemical and physical property modifications. Perovskite oxides - with the formula ABO3 in which A tends to be an alkali, alkaline earth, or rare earth metal, and B tends to be a transition or post-transition metal - offer a wide variety of tunable optoelectronic and magnetic properties. Lateral patterning of these properties can enable new architectures in oxide-based electronic, magnetic memory, spintronic, and ionic devices. I laterally pattern such properties in perovskite film SrFeO3-[delta] by combining photolithography with reduction/oxidation and fluoridation topochemistries to fabricate laterally-heterostructured films of SrFeO3, reduced SrFeO2.5, and fluoridated phase SrFeO2F. I also demonstrate that the chemical stability of SrFeO2F enables dynamically-control patterned properties through selective reversible redox chemistry of oxide phases. In a second, related yet quite different materials class, the hybrid organic/inorganic lead halide perovskites, I demonstrate that fluoridation topochemistry exerts strong influence over the dynamics of photoinduced charge carriers, with significant implications for photovoltaic devices. Issues in these materials arise from the weak bonding at crystalline surfaces and interfaces. I test the hypothesis that topochemically applied fluoride, selectively added at the surface of hybrid perovskite thin films improves surface chemistry through strong bonding. Under optimized conditions, fluoridation improves the photoinduced charge carrier lifetimes by three-fold. Meanwhile, "overfluoridation" leads to the generation of PbF2 which is identified herein to act as an electron-acceptor for the conduction band of the perovskite.
Author: Tze-Chien Sum
Publisher: John Wiley & Sons
ISBN: 3527341110
Category : Technology & Engineering
Languages : en
Pages : 312
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Book Description
Real insight from leading experts in the field into the causes of the unique photovoltaic performance of perovskite solar cells, describing the fundamentals of perovskite materials and device architectures. The authors cover materials research and development, device fabrication and engineering methodologies, as well as current knowledge extending beyond perovskite photovoltaics, such as the novel spin physics and multiferroic properties of this family of materials. Aimed at a better and clearer understanding of the latest developments in the hybrid perovskite field, this is a must-have for material scientists, chemists, physicists and engineers entering or already working in this booming field.
Author: Michael E. Brown
Publisher: Elsevier
ISBN: 0080868169
Category : Science
Languages : en
Pages : 355
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Book Description
The whole of Volume 22 is devoted to the kinetics and mechanisms of the decomposition and interaction of inorganic solids, extended to include metal carboxylates. After an introductory chapter on the characteristic features of reactions in the solid phase, experimental methods of investigation of solid reactions and the measurement of reaction rates are reviewed in Chapter 2 and the theory of solid state kinetics in Chapter 3. The reactions of single substances, loosely grouped on the basis of a common anion since it is this constituent which most frequently undergoes breakdown, are discussed in Chapter 4, the sequence being effectively that of increasing anion complexity. Chapter 5 covers reactions between solids, and includes catalytic processes where one solid component remains unchanged, double compound formation and rate processes involving the interactions of more than three crystalline phases. The final chapter summarises the general conclusions drawn in the text of Chapter 2-5.
Author: S V Krivovichev
Publisher: Springer Science & Business Media
ISBN: 3642200184
Category : Science
Languages : en
Pages : 424
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Book Description
This book is a collection of papers that are devoted to various aspects of interactions between mineralogy and material sciences. It will include reviews, perspective papers and original research papers on mineral nanostructures, biomineralization, micro- and nanoporous mineral phases as functional materials, physical and optical properties of minerals, etc. Many important materials that dominate modern technological development were known to mineralogists for hundreds of years, though their properties were not fully recognized. Mineralogy, on the other hand, needs new impacts for the further development in the line of modern scientific achievements such as bio- and nanotechnologies as well as by the understanding of a deep role that information plays in the formation of natural structures and definition of natural processes. It is the idea of this series of books to provide an arena for interdisciplinary discussion on minerals as advanced materials.
Author: Babak Anasori
Publisher: Springer Nature
ISBN: 3030190269
Category : Technology & Engineering
Languages : en
Pages : 534
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Book Description
This book describes the rapidly expanding field of two-dimensional (2D) transition metal carbides and nitrides (MXenes). It covers fundamental knowledge on synthesis, structure, and properties of these new materials, and a description of their processing, scale-up and emerging applications. The ways in which the quickly expanding family of MXenes can outperform other novel nanomaterials in a variety of applications, spanning from energy storage and conversion to electronics; from water science to transportation; and in defense and medical applications, are discussed in detail.
Author: Francis S. Galasso
Publisher: Elsevier
ISBN: 1483146022
Category : Science
Languages : en
Pages : 228
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Book Description
Structure, Properties and Preparation of Perovskite-Type Compounds, Volume 5 presents the various methods of preparing powders, single crystals, and thin films of perovskite-type compounds. This book discusses the structure of perovskite-type compounds and their properties. Organized into 11 chapters, this volume begins with an overview of the structure, properties, and preparation of perovskite-type compounds. This text then examines how X-ray diffraction can be used to determine unit cell data and to orient single crystals. Other chapters consider the effect of nuclear radiation on the properties of ferroelectric materials. This book discusses as well the phase transitions in perovskite-type compounds, which are often associated with a change in ferroelectric properties. The final chapter explores the two techniques in the preparation of the ternary carbides with the perovskite structure, which involves melting the appropriate proportions of the two metals and carbon under argon. This book is a valuable resource for solid-state chemists.
Author: Hiroyuki Fujiwara
Publisher: John Wiley & Sons
ISBN: 3527347291
Category : Technology & Engineering
Languages : en
Pages : 612
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Book Description
Unparalleled coverage of the most vibrant research field in photovoltaics! Hybrid perovskites, revolutionary game-changing semiconductor materials, have every favorable optoelectronic characteristic necessary for realizing high efficiency solar cells. The remarkable features of hybrid perovskite photovoltaics, such as superior material properties, easy material fabrication by solution-based processing, large-area device fabrication by an inkjet technology, and simple solar cell structures, have brought enormous attentions, leading to a rapid development of the solar cell technology at a pace never before seen in solar cell history. Hybrid Perovskite Solar Cells: Characteristics and Operation covers extensive topics of hybrid perovskite solar cells, providing easy-to-read descriptions for the fundamental characteristics of unique hybrid perovskite materials (Part I) as well as the principles and applications of hybrid perovskite solar cells (Part II). Both basic and advanced concepts of hybrid perovskite devices are treated thoroughly in this book; in particular, explanatory descriptions for general physical and chemical aspects of hybrid perovskite photovoltaics are included to provide fundamental understanding. This comprehensive book is highly suitable for graduate school students and researchers who are not familiar with hybrid perovskite materials and devices, allowing the accumulation of the accurate knowledge from the basic to the advanced levels.
Author: Kazufumi Kobashi
Publisher: Woodhead Publishing
ISBN: 008102889X
Category : Technology & Engineering
Languages : en
Pages : 312
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Book Description
Microsupercapacitors systematically guides the reader through the key materials, characterization techniques, performance factors and potential applications and benefits to society of this emerging electrical energy storage solution. The book reviews the technical challenges in scaling down supercapacitors, covering materials, performance, design and applications perspectives. Sections provide a fundamental understanding of microsupercapacitors and compare them to existing energy storage technologies. Final discussions consider the factors that impact performance, potential tactics to improve performance, barriers to implementation, emerging solutions to those barriers, and a future outlook. This book will be of particular interest to materials scientists and engineers working in academia, research and development. - Provides a concise introduction of the fundamental science, related technological challenges, and solutions that microsupercapacitors can offer - Compares microsupercapacitors with current technologies - Reviews the applications of new strategies and the challenge of scaling down supercapacitors - Covers the most relevant applications, including energy storage, energy harvesting, sensors and biomedical devices
Author: Yanhua Luo
Publisher: BoD – Books on Demand
ISBN: 1839682426
Category : Technology & Engineering
Languages : en
Pages : 165
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Book Description
Bismuth—a wonder metal with unique features—plays an important role in the bismuth-related optoelectronic materials. The innovative development of bismuth optoelectronic materials will undoubtedly drive the social development and economic growth in the world towards a glorious future.
Author: A.P. Legrand
Publisher: Springer Science & Business Media
ISBN: 1475796498
Category : Science
Languages : en
Pages : 503
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Book Description
Conjugated polymers suoh as polyaoetylene (CH)x polyphenylene (C6H4)x' poly thiophene (C4H2S)x' etc., which are insulators in their pristine state, can be brought to the metallic state after "doping" with ohemioal speoies whioh oan be either eleotron donors or I aoceptors. . This doping prooess involves a oharge transfer between the dopant moleoule and the polymer ohain whioh are then supposed to be spatially olose to each other. It follows that the meohanism of doping must be oonsidered as an aotual interoalation process, which will greatly affeot the struotural oharacteristios of the starting material, as well as its morphology, as has been observed during the 2 intercalation of graphite and layered compounds . In parallel with these modifioations, the band struoture of the system changes yielding a new set of eleotronio properties. It is evident therefore that the struotural and eleotronio properties are intimately related, and must be studied simultaneously in the same system to give reliable information. A great number of studies have been devoted to the structural and electronic properties of conjugated polymers after a chemical or 2 electrochemical doping process . Most of these concern the properties of the system for a given dopant concentration. With this approach a universal pioture of the polymer/dopant system is very diffioult to obtain, as a comparison between different experiments is very hazardous. On the other hand, only a small number of measurements have been performed during the continuous electroohemioal doping of various polymers.
