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The Phase Dependent Optoelectronic Properties Of Ternary I Iii Vi2 Semiconductor Nanocrystals And Their Synthesis
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Book Synopsis The Phase Dependent Optoelectronic Properties of Ternary I-III-VI2 Semiconductor Nanocrystals and Their Synthesis by : Alice Dorinda Penrice Leach
Download or read book The Phase Dependent Optoelectronic Properties of Ternary I-III-VI2 Semiconductor Nanocrystals and Their Synthesis written by Alice Dorinda Penrice Leach and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Property Characterization of Novel Ternary Semiconductor Nanomaterials by : Baodong Mao
Download or read book Synthesis and Property Characterization of Novel Ternary Semiconductor Nanomaterials written by Baodong Mao and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alloying and doping have been widely used for band gap engineering and property tuning of semiconductor nanocrystals, providing novel composition and structure dependent properties. Ternary I-III-VI semiconductors represent one of the best heavy-metal-free optoelectronic materials. Here, efforts are devoted to improving the optical and electrical properties of the semiconductor nanocrystals and photophysical studies of related mechanisms. AgInS2 nanocrystals with tunable sizes and optical properties were synthesized in toluene at low temperature. The role of surface and intrinsic defects were studied using time-resolved photoluminecence and femtosecond transient absorption spectroscopies. Extremely long-lived excitons were observed in the AgInS2 nanocrystals, which can benefit potential phototovoltaic applications by increasing charge separation. Series of AgInS2-ZnS nanocrystals were synthesized by heating a Ag/In/Zn/S solution showing tunable PL which initially exhibits a red shift but ultimately finishes with blue shifted emission with increasing temperature. The incorporation of Zn and the increased cation exchange of silver by zinc at higher temperatures strongly influences the PL behavior. Systematic investigation by time-resolved spectroscopy showed distinguishable PL behaviors between developing and fully grown AgInS2-ZnS nanocrystals. We also synthesized near-infrared emitting AgInS2/ZnS nanocrystals with a thin layer of ZnS by carefully controlling the growing condition. The unexpected PL red shift and band gap reduction was ascribed to the local structural ordering in the thin gradient alloyed surface layer. Zinc concentration and growth temperatures played important roles in the formation of the near-infrared emitting nanocrystals, which are promising for bioimaging applications. For the self-doped Cu2-xS nanocrystals, several methods were explored to tune the free carrier plasmon absorption properties, which showed dramatic change with the amount of hole doping resulted from copper deficiency. X-ray photoelectron spectroscopy was used to identify the copper oxidation stayes and the origin of the valence band vacancies. Detailed analysis suggested an interesting partially oxidized layer on the nanocrystal surface. The last section is devoted to improving the thermoelectric performance of nanostructured ternary Bi0̣5Sb1̣5Te3. Sintering was found to increase ZT as a function of sintering temperature by increasing the charge carrier mobility more than the lattice thermal conductivity, resulting in an overall increase of thermoelectric performance
Book Synopsis Semiconductor Nanocrystals and Metal Nanoparticles by : Tupei Chen
Download or read book Semiconductor Nanocrystals and Metal Nanoparticles written by Tupei Chen and published by CRC Press. This book was released on 2016-10-14 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor nanocrystals and metal nanoparticles are the building blocks of the next generation of electronic, optoelectronic, and photonic devices. Covering this rapidly developing and interdisciplinary field, the book examines in detail the physical properties and device applications of semiconductor nanocrystals and metal nanoparticles. It begins with a review of the synthesis and characterization of various semiconductor nanocrystals and metal nanoparticles and goes on to discuss in detail their optical, light emission, and electrical properties. It then illustrates some exciting applications of nanoelectronic devices (memristors and single-electron devices) and optoelectronic devices (UV detectors, quantum dot lasers, and solar cells), as well as other applications (gas sensors and metallic nanopastes for power electronics packaging). Focuses on a new class of materials that exhibit fascinating physical properties and have many exciting device applications. Presents an overview of synthesis strategies and characterization techniques for various semiconductor nanocrystal and metal nanoparticles. Examines in detail the optical/optoelectronic properties, light emission properties, and electrical properties of semiconductor nanocrystals and metal nanoparticles. Reviews applications in nanoelectronic devices, optoelectronic devices, and photonic devices.
Book Synopsis Colloidal Semiconductor Nanocrystals: Synthesis, Properties, and Applications by : Vladimir Lesnyak
Download or read book Colloidal Semiconductor Nanocrystals: Synthesis, Properties, and Applications written by Vladimir Lesnyak and published by Frontiers Media SA. This book was released on 2020-01-06 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Semiconductor and Metal Nanocrystals by : Victor I. Klimov
Download or read book Semiconductor and Metal Nanocrystals written by Victor I. Klimov and published by CRC Press. This book was released on 2003-11-07 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vast technological potential of nanocrystalline materials, as well as current intense interest in the physics and chemistry of nanoscale phenomena, has led to explosive growth in research on semiconductor nanocrystals, also known as nanocrystal quantum dots, and metal nanoparticles. Semiconductor and Metal Nanocrystals addresses current topics impacting the field including synthesis and assembly of nanocrystals, theory and spectroscopy of interband and intraband optical transitions, single-nanocrystal optical and tunneling spectroscopies, electrical transport in nanocrystal assemblies, and physical and engineering aspects of nanocrystal-based devices. Written by experts who have contributed pioneering research, this reference comprises key advances in the field of semiconductor nanocrystal quantum dots and metal nanoparticles over the past several years. Focusing specifically on nanocrystals generated through chemical techniques, Semiconductor and Metal Nanocrystals Merges investigative frontiers in physics, chemistry, and engineering Documents advances in nanocrystal synthesis and assembly Explores the theory of electronic excitations in nanoscale particles Presents comprehensive information on optical spectroscopy of interband and intraband optical transitions Reviews data on single-nanocrystal optical and tunneling spectroscopies Weighs controversies related to carrier relaxation dynamics in ultrasmall nanoparticles Discusses charge carrier transport in nanocrystal assemblies Provides examples of lasing and photovoltaic nanocrystal-based devices Semiconductor and Metal Nanocrystals is a must read for scientists, engineers, and upper-level undergraduate and graduate students interested in the physics and chemistry of nanoscale semiconductor and metal particles, as well as general nanoscale science. About the Editor: VICTOR I. KLIMOV is Team Leader, Softmatter Nanotechnology and Advanced Spectroscopy Team, Chemistry Division, Los Alamos National Laboratory, New Mexico. The recipient of the Los Alamos Fellows Prize (2000), he is a Fellow of the Alexander von Humboldt Foundation, leader of the Nanophotonics and Nanoelectronics Thrust of the Center for Integrated Nanotechnologies (U.S. Department of Energy), a member of the Los Alamos Board of Governors of the Institute for Complex Adaptive Matter, and a member of the Steering Committee for the Los Alamos Quantum Institute. He received the M.S. (1978), Ph.D. (1981), and Dr. Sci. (1993) degrees from Moscow State University, Russia.
Book Synopsis Nanoscale Compound Semiconductors and their Optoelectronics Applications by : Vijay B. Pawade
Download or read book Nanoscale Compound Semiconductors and their Optoelectronics Applications written by Vijay B. Pawade and published by Woodhead Publishing. This book was released on 2022-01-21 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoscale Compound Semiconductors and their Optoelectronics Applications provides the basic and fundamental properties of nanoscale compound semiconductors and their role in modern technological products. The book discusses all important properties of this important category of materials such as their optical properties, size-dependent properties, and tunable properties. Key methods are reviewed, including synthesis techniques and characterization strategies. The role of compound semiconductors in the advancement of energy efficient optoelectronics and solar cell devices is also discussed. The book also touches on the photocatalytic property of the materials by doping with graphene oxides--an emerging and new pathway. Covers all relevant types of nanoscale compound semiconductors for optoelectronics, including their synthesis, properties and applications Provides historical context and review of emerging trends in semiconductor technology, particularly emphasizing advances in non-toxic semiconductor materials for green technologies Reviews emerging applications of nanoscale compound semiconductor-based devices in optoelectronics, energy and environmental sustainability
Book Synopsis Photoelectrochemical Solar Cells by : Nurdan Demirci Sankir
Download or read book Photoelectrochemical Solar Cells written by Nurdan Demirci Sankir and published by John Wiley & Sons. This book was released on 2018-12-10 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overall view of the photoelectrochemical systems for solar hydrogen generation, and new and novel materials for photoelectrochemical solar cell applications. The book is organized in three parts. General concepts and photoelectrochemical systems are covered in Part I. Part II is devoted to photoactive materials for solar hydrogen generation. Main focus of the last part is the photoelectrochemical related systems. This part provides a diverse information about the implementation of multi-junctional solar cells in solar fuel generation systems, dye-sensitized solar hydrogen production and photocatalytic formation of photoactive semiconductors.
Book Synopsis A Study on the Synthesis and Characterization of Ternary Semiconductor Nanocrystals by : Tyler Hurlburt
Download or read book A Study on the Synthesis and Characterization of Ternary Semiconductor Nanocrystals written by Tyler Hurlburt and published by . This book was released on 2013 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solution-Processable Components for Organic Electronic Devices by : Beata Luszczynska
Download or read book Solution-Processable Components for Organic Electronic Devices written by Beata Luszczynska and published by John Wiley & Sons. This book was released on 2019-09-16 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides first-hand insights into advanced fabrication techniques for solution processable organic electronics materials and devices The field of printable organic electronics has emerged as a technology which plays a major role in materials science research and development. Printable organic electronics soon compete with, and for specific applications can even outpace, conventional semiconductor devices in terms of performance, cost, and versatility. Printing techniques allow for large-scale fabrication of organic electronic components and functional devices for use as wearable electronics, health-care sensors, Internet of Things, monitoring of environment pollution and many others, yet-to-be-conceived applications. The first part of Solution-Processable Components for Organic Electronic Devices covers the synthesis of: soluble conjugated polymers; solution-processable nanoparticles of inorganic semiconductors; high-k nanoparticles by means of controlled radical polymerization; advanced blending techniques yielding novel materials with extraordinary properties. The book also discusses photogeneration of charge carriers in nanostructured bulk heterojunctions and charge carrier transport in multicomponent materials such as composites and nanocomposites as well as photovoltaic devices modelling. The second part of the book is devoted to organic electronic devices, such as field effect transistors, light emitting diodes, photovoltaics, photodiodes and electronic memory devices which can be produced by solution-based methods, including printing and roll-to-roll manufacturing. The book provides in-depth knowledge for experienced researchers and for those entering the field. It comprises 12 chapters focused on: ? novel organic electronics components synthesis and solution-based processing techniques ? advanced analysis of mechanisms governing charge carrier generation and transport in organic semiconductors and devices ? fabrication techniques and characterization methods of organic electronic devices Providing coverage of the state of the art of organic electronics, Solution-Processable Components for Organic Electronic Devices is an excellent book for materials scientists, applied physicists, engineering scientists, and those working in the electronics industry.
Book Synopsis Colloidal Synthesis and Optical Characterizations of Semiconductor Nanocrystals from Nontoxic Elements by : Minh Q. Ho
Download or read book Colloidal Synthesis and Optical Characterizations of Semiconductor Nanocrystals from Nontoxic Elements written by Minh Q. Ho and published by . This book was released on 2015 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: To date, the search efforts have shifted from the toxic II-VI, III-V and IV-VI semiconductors to more environmentally friendly materials. Among Group II-V semiconductors, Zn3P2 has shown to be a more benign option, similar to Group IV (Ge, Si) materials, for future applications in photovoltaics and optoelectronics. This work is dedicated to the development of wet-chemical synthetic routes of (1) Zn3P2 and (2) Group IV (Ge, Si, Si1-xGex) nanocrystals with precise control over composition, crystal structure, size and dispersity by adjusting different reaction parameters such as temperature, time and solvent composition. Different characterizations will also be employed to probe the size- and composition-dependent physical and optical properties of resulting products. The first part of this work illustrates the synthesis of luminescent Zn3P2 nanocrystals, an earth-abundant and a direct-gap semiconductor possessing high absorption coefficient and long carrier diffusion length, which uphold promising potential in many optoelectronic applications. A hot injection method by using highly reactive P and Zn precursors (P[Si(CH3)3]3 and diethyl zinc) in hexadecylamine and octadecene was developed to prepare a series of alkyl-amine-passivated tetragonal Zn3P2 crystallites with varying size sizes. Substantial blue shifts in the absorption onsets (2.11 - 2.73 eV) in comparison to the bulk counterpart (1.4 - 1.5 eV) and a clear red shift with increasing particle size indicates the quantum confinement effects. This is also consistent with the photoluminescent studies with the size-tunable maxima in the visible region (469 - 545 nm) as a function of growth temperature and time. The phase purity and alkyl-amine passivation of the nanocrystals were determined by structural and surface analysis, confirming the presence of N - Zn and N - P bonds on the tetragonal Zn3P2 crystallites. The second part of this works focuses on the development of a colloidal synthetic strategy of alkyl-amine capped Si1-xGex nanocrystals with control over size- and composition-dependent optical properties. Despite their high miscibility at all compositions, developing a wet-chemical synthesis of Si1-xGex alloys in the nanoscale remains a challenging task, owing to the difference of their crystallization temperatures and the high surface oxidation of Si. Thus an adapted colloidal method is utilized to fabricate single-element Ge and Si nanocrystals. Powder X-ray diffraction indicates successful production of cubic crystalline Ge and amorphous Si nanoparticles individually in oleylamine/octadecene (surfactant/solvent) mixture at 300°C. Absorption onset values of 1.28 eV and 3.11 eV are obtained for resulting Ge and Si colloids, respectively. By alloying these two materials in their nano-regime, tunable optical properties can be achieved throughout the visible to the near IR region by simply varying their elemental compositions. The success of this bandgap engineering process offers more options for new material design by taking advantage of unique properties from each component material.
Book Synopsis Core/Shell Quantum Dots by : Xin Tong
Download or read book Core/Shell Quantum Dots written by Xin Tong and published by Springer Nature. This book was released on 2020-07-01 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book outlines various synthetic approaches, tuneable physical properties, and device applications of core/shell quantum dots (QDs). Core/shell QDs have exhibited enhanced quantum yield (QY), suppressed photobleaching/blinking, and significantly improved photochemical/physical stability as compared to conventional bare QDs. The core-shell structure also promotes the easy tuning of QDs’ band structure, leading to their employment as attractive building blocks in various optoelectronic devices. The main objective of this book is to create a platform for knowledge sharing and dissemination of the latest advances in novel areas of core/shell QDs and relevant devices, and to provide a comprehensive introduction and directions for further research in this growing area of nanomaterials research.
Book Synopsis SYNTHESIS AND APPLICATIONS OF HETEROSTRUCTURED SEMICONDUCTOR NANOCRYSTALS by : Elena Khon
Download or read book SYNTHESIS AND APPLICATIONS OF HETEROSTRUCTURED SEMICONDUCTOR NANOCRYSTALS written by Elena Khon and published by . This book was released on 2013 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor nanocrystals (NCs) have been of great interest to researchers for several decades due to their unique optoelectronic properties. These nanoparticles are widely used for a variety of different applications. However, there are many unresolved issues that lower the efficiency and/or stability of devices which incorporate these NCs. Our research is dedicated to addressing these issues by identifying potential problems and resolving them, improving existing systems, generating new synthetic strategies, and/or building new devices. The general strategies for the synthesis of different nanocrystals were established in this work, one of which is the colloidal growth of gold domains onto CdS semiconductor nanocrystals. Control of shape and size was achieved simply by adjusting the temperature and the time of the reaction. Depending on the exact morphology of Au and CdS domains, fabricated nano-composites can undergo evaporation-induced self-assembly onto a substrate, which is very useful for building devices. CdS/Au heterostructures can assemble in two different ways: through end-to-end coupling of Au domains, resulting in the formation of one-dimensional chains; and via side-by-side packing of CdS nanorods, leading to the onset of two-dimensional superlattices. We investigated the nature of exciton-plasmon interactions in Au-tipped CdS nanorods using femtosecond transient absorption spectroscopy. The study demonstrated that the key optoelectronic properties of electrically coupled metal and semiconductor domains are significantly different from those observed in systems with weak inter-domain coupling. In particular, strongly-coupled nanocomposites promote mixing of electronic states at semiconductor-metal domain interfaces, which causes a significant suppression of both plasmon and exciton carrier excitations. Colloidal QDs are starting to replace organic molecules in many different applications, such as organic light emmiting diods (OLEDs), due to their light emmision tunability. We reported a general strategy for the assembly of all-inorganic light-emitting nanocrystal films with an emission quantum yield in the 30-52% range. Our methodology relies on solution-processing of CdSe nanocrystals into a crystalline matrix of a wide band gap semiconductor (CdS, ZnS). As a result, we replace original organic ligands on nanocrystal surfaces with an inorganic medium which efficiently preserves the quantum confinement of electrical charges in CdSe NCs. In addition to strong emission, fabricated films demonstrated excellent thermal and chemical stability, and a large refractive index, which avails their integration into emerging solid-state nanocrystal devices. The ability to control size and shape of NCs is essential as it automatically affects the optoelectronic properties of the crystals. Colloidal chemistry offers an assortment of synthetic tools for tuning the shape of NCs, but some nanoparticle morphologies require alternative processing strategies. We have shown that chemical etching of colloidal nanoparticles can facilitate the realization of desirable nanocrystal geometries. This methodology allows both CdSe and CdS composed semiconductor domains be exposed to the external environment, while maintaining a structural design that is highly desirable for catalytic applications. Hydrogen production tests confirmed the improved catalytic activity of CdSe/CdS dimers. We expect that the demonstrated application will become a common methodology in the synthesis of charge-separating nanocrystals, leading to advanced nanoparticle architectures for applications in the areas of photocatalysis, photovoltaics, and light detection.
Book Synopsis The Optoelectronic Properties of Surface-modified Semiconductor Nanocrystal Solids by : Earl D. Goodwin
Download or read book The Optoelectronic Properties of Surface-modified Semiconductor Nanocrystal Solids written by Earl D. Goodwin and published by . This book was released on 2015 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Colloidal semiconductor nanocrystals have emerged as fascinating new materials and gained interest in the last 30 years because of their size, shape, and compositionally tunable electronic and optical properties as well as their potential to serve as artificial atoms. Challenges and opportunities have arisen when assembling nanocrystals into nanocrystal solids for electronic and optoelectronic applications, largely because of the significant influence of nanocrystal surface chemistry on the electronic, optical, and structural properties of nanocrystal solids. In order to assemble nanocrystal solids for high performance devices, we must understand and be able to control the effects of nanocrystal surface organic capping ligands, non-stoichiometry, and impurity doping on the electronic and optoelectronic properties of the nanocrystal solids.
Book Synopsis Colloidal Synthesis of I-III-VI Semiconductor Nanocrystals and Study of Their Optical Properties by : Ankita Bora
Download or read book Colloidal Synthesis of I-III-VI Semiconductor Nanocrystals and Study of Their Optical Properties written by Ankita Bora and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tuning Optoelectronic Properties of Small Semiconductor Nanocrystals Ligand Chemistry Through Surface by : Katie Nicole Lawrence
Download or read book Tuning Optoelectronic Properties of Small Semiconductor Nanocrystals Ligand Chemistry Through Surface written by Katie Nicole Lawrence and published by . This book was released on 2016 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthetic Control of Semiconductor Nanocrystal Properties Through Precursor Chemistry by : Soren F. Sandeno
Download or read book Synthetic Control of Semiconductor Nanocrystal Properties Through Precursor Chemistry written by Soren F. Sandeno and published by . This book was released on 2021 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor nanocrystals, more commonly known as quantum dots, have recently become a popular discipline of research due to their unique size-dependent photoluminescent properties leading towards a diverse variety of applications in solar cell technologies, highly efficient displays, biomedical imaging, and tumor therapy. These materials require a high degree of synthetic control due to the number of variables that can affect their formation. One approach to influencing the synthesis of quantum dots uses the structure of precursors to fine-tune their reactivity and, by doing so, control the kinetics of the reaction. This strategy can be applied to controlling many physical properties of the nanocrystals including size, shape, and crystalline phase. Presented here are two attempts at using precursor structure to influence the properties of quantum dots. Firstly, the possibility of using thiourea structure to control the formation of copper sulfide phases was investigated. Due to the complex valencies of both elements in copper sulfide phases, achieving phase selectivity and control has been a persistent challenge in nanocrystal synthesis. Influencing reaction kinetics through tuning precursor reactivity presents itself as a powerful possible solution to synthetically controlling the phases of copper sulfide. Secondly, zinc sulfide single-source precursors were designed and tested to gauge if their structure can be used to influence crystal size. It was shown that the thermal decomposition of substituted thiourea-based single-source precursors resulted in zinc sulfide nanocrystals with measurable reaction kinetics. Both the phase control of copper sulfide and the design of zinc sulfide single-source precursors generate promising potential in synthetic control through precursor chemistry.
Book Synopsis Semiconductor Nanocrystal Quantum Dots by : Andrey Rogach
Download or read book Semiconductor Nanocrystal Quantum Dots written by Andrey Rogach and published by Springer Science & Business Media. This book was released on 2008-09-02 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book to specifically focus on semiconductor nanocrystals, and address their synthesis and assembly, optical properties and spectroscopy, and potential areas of nanocrystal-based devices. The enormous potential of nanoscience to impact on industrial output is now clear. Over the next two decades, much of the science will transfer into new products and processes. One emerging area where this challenge will be very successfully met is the field of semiconductor nanocrystals. Also known as colloidal quantum dots, their unique properties have attracted much attention in the last twenty years.
