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Transient Optical Studies Of Photoinduced Charge Transfer In Semiconductor Quantum Dot Solar Cells
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Book Synopsis Transient Optical Studies of Photoinduced Charge Transfer in Semiconductor Quantum Dot Solar Cells by : Henry C. Leventis
Download or read book Transient Optical Studies of Photoinduced Charge Transfer in Semiconductor Quantum Dot Solar Cells written by Henry C. Leventis and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transient Optical Studies of Photoinduced Charge Transfer in Semiconductor Quantum Dot Solar Cells by :
Download or read book Transient Optical Studies of Photoinduced Charge Transfer in Semiconductor Quantum Dot Solar Cells written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Colloidal Quantum Dot Optoelectronics and Photovoltaics by : Gerasimos Konstantatos
Download or read book Colloidal Quantum Dot Optoelectronics and Photovoltaics written by Gerasimos Konstantatos and published by Cambridge University Press. This book was released on 2013-11-07 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Captures the most up-to-date research in the field, written in an accessible style by the world's leading experts.
Book Synopsis Colloidal Quantum Dot Optoelectronics and Photovoltaics by : Gerasimos Konstantatos
Download or read book Colloidal Quantum Dot Optoelectronics and Photovoltaics written by Gerasimos Konstantatos and published by Cambridge University Press. This book was released on 2013-11-07 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Capturing the most up-to-date research in colloidal quantum dot (CQD) devices, this book is written in an accessible style by the world's leading experts. The application of CQDs in solar cells, photodetectors and light-emitting diodes (LEDs) has developed rapidly over recent years, promising to transform the future of clean energy, communications, and displays. This complete guide to the field provides researchers, students and practitioners alike with everything they need to understand these developments and begin contributing to future applications. Introductory chapters summarise the fundamental physics and chemistry, whilst later chapters review the developments that have propelled the field forwards, systematically working through key device advances. The science of CQD films is explained through the latest physical models of semiconductor transport, trapping and recombination, whilst the engineering of organic and inorganic multilayered materials is shown to have enabled major advances in the brightness and efficiency of CQD LEDs.
Book Synopsis Exciton Relaxation and Electron Transfer Dynamics of Semiconductor Quantum Dots by : Cunming Liu
Download or read book Exciton Relaxation and Electron Transfer Dynamics of Semiconductor Quantum Dots written by Cunming Liu and published by . This book was released on 2015 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Quantum dots (QDs) exhibit unique electronic and optical properties arising from their three-dimensional confinement and strongly enhanced coulomb interactions. Developing a detailed understanding of their exciton relaxation dynamics is important not only for the sake of exploring the fundamental physics of quantum confinement processes, but also for their potential applications. Ultrafast transient absorption (TA) spectroscopy, which has been proven as a powerful tool to explore the relaxation dynamics of excitons, was employed to characterize the hot single/multiexciton relaxation dynamics at the first four exciton states 1Se-1S3/2 (1S), 1Se-2S3/2 (2S), 1Pe-1P3/2 (1P) and 1Se-2S1/2 (2SH) of CdSe/CdZnS QDs. We found all exciton states can accomplish their initialization in sub-ps timescales. And, the 1S single exciton mainly relaxes to surface trapping state with a lifetime of 0.90 ł 0.02 ns. A 74 ł 2 ps Auger recombination occurs to nonradiatively annihilate 1S multiexctions under higher pump fluence. We also observed for the first time that the 2S hot hole can relax via two possible pathways-intraband multiple phonon coupling (2S3/2-1P3/2 or 2S3/2-1S3/2) and the intrinsic defect trapping, with a lifetime of 7 ł 2 ps. Owing to the overlap between highly energetic 1P and 2SH exciton states, their probed dynamics both show the characteristics of 1P and 2SH exciton states. Surprisingly, an ultra-short component of 8 ł 1 ps, directly associated with the Auger recombination at the 1P exciton state, was discovered under higher pump fluence. After finishing the studies of exciton relaxation inside QDs, ultrafast TA spectroscopy was further applied to explore the electron transferring outside from QDs. By employing a novel photocatalytic system consisting of water-soluble CdSe QDs and Ni-dihydrolipoic acid (Ni-DHLA) catalyst, which has represented a robust photocatalysis of H2 from water, the photoinduced electron transfer (ET) dynamics between QDs and catalyst, one of most primary steps during H2 generation, was studied. We found that smaller bare CdSe QDs exhibit a better ET performance with an amplitude-weighted average lifetime of 69 ł 2 ps. And, nearly ~90% of TA signal in the presence of Ni-DHLA can be attributed to the ET process. CdS shelling on the bare CdSe QDs worsens the ET between QDs and Ni-DHLA catalysts. Under higher pump fluence, the ET performance with CdSe/CdS core-shell QDs is improved because of the Auger recombination in CdSe cores strongly suppressed by CdS shelling, which is contrary with bare CdSe QDs. These studies may supply potential ways to optimize the QDs sensitized photocatalytic systems for H2 production. Finally, by virtue of effective mass approximation (EMA) method and Marcus theory, the mechanism of ET between CdSe QDs and Ni-DHLA catalysts was clarified in theory. Additionally, photoluminescence (PL) quenching and time-resolved PL measurements were used to demonstrate that the main pathway for ET between QDs and Ni-DHLA catalysts is through dynamic collisions. As Ni-DHLA concentration increases, the static attachment between QDs and Ni-DHLA catalyst molecules can occur to further speed up the ET process from QDs to Ni-DHLA catalysts."--Pages vi-vii.
Book Synopsis Quantum Dot Solar Cells by : Jiang Wu
Download or read book Quantum Dot Solar Cells written by Jiang Wu and published by Springer Science & Business Media. This book was released on 2013-09-28 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: The third generation of solar cells includes those based on semiconductor quantum dots. This sophisticated technology applies nanotechnology and quantum mechanics theory to enhance the performance of ordinary solar cells. Although a practical application of quantum dot solar cells has yet to be achieved, a large number of theoretical calculations and experimental studies have confirmed the potential for meeting the requirement for ultra-high conversion efficiency. In this book, high-profile scientists have contributed tutorial chapters that outline the methods used in and the results of various quantum dot solar cell designs, including quantum dot intermediate band solar cells, hot electron quantum dot solar cells, quantum-dot sensitized solar cells, colloidal quantum dot solar cells, hybrid polymer-quantum dot solar cells, and MEG quantum dot solar cells. Both theoretical and experimental approaches are described. Quantum Dot Solar Cells helps to connect the fundamental laws of physics and the chemistry of materials with advances in device design and performance. The book can be recommended for a broad audience of chemists, electrical engineers, and materials scientists, and is suitable for use in courses on materials and device design for advanced and future optoelectronics.
Book Synopsis Semiconductor Nanoclusters - Physical, Chemical, and Catalytic Aspects by : P.V. Kamat
Download or read book Semiconductor Nanoclusters - Physical, Chemical, and Catalytic Aspects written by P.V. Kamat and published by . This book was released on 1997 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflecting the shift over the past decade from theoretical descriptions to field utilizations of nanostructure-based devices, researchers present the salient features of nanocrystalline semiconductor materials for scientists, engineers, and advanced graduate students in physical chemistry and materials science. The topics include preparing and characterizing nanoparticles, sonochemistry in colloidal systems, the pseudopotential theory of nanometer silicon quantum dots, size quantization in semiconductor films deposited by chemical solutions, electronic junctions, analytical chemistry, semiconductor-mediated photocatalysis for organic synthesis, and applications in purifying air. Annotation copyrighted by Book News, Inc., Portland, OR
Book Synopsis Quantum Dot Devices by : Zhiming M. Wang
Download or read book Quantum Dot Devices written by Zhiming M. Wang and published by Springer Science & Business Media. This book was released on 2012-05-24 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum dots as nanomaterials have been extensively investigated in the past several decades from growth to characterization to applications. As the basis of future developments in the field, this book collects a series of state-of-the-art chapters on the current status of quantum dot devices and how these devices take advantage of quantum features. Written by 56 leading experts from 14 countries, the chapters cover numerous quantum dot applications, including lasers, LEDs, detectors, amplifiers, switches, transistors, and solar cells. Quantum Dot Devices is appropriate for researchers of all levels of experience with an interest in epitaxial and/or colloidal quantum dots. It provides the beginner with the necessary overview of this exciting field and those more experienced with a comprehensive reference source.
Book Synopsis Solar Energy Conversion by : Piotr Piotrowiak
Download or read book Solar Energy Conversion written by Piotr Piotrowiak and published by Royal Society of Chemistry. This book was released on 2013-10-09 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance of developing new, clean and renewable sources of energy will continue to grow in the foreseeable future and so will the need for the education of researchers in this field of research. The interest and challenges of the field continue to shift from simple homogeneous solutions to increasingly more complex heterogeneous systems and interfaces. Over the past decade there have been numerous theoretical and experimental breakthroughs many of which still exist only in the primary literature. The aim of this book is to gather in one volume the description of modern, sometimes exploratory, experimental and theoretical techniques applied to the dynamics of interfacial electron and electronic excitation transfer processes studied in the context of solar energy conversion. The intended treatment will be fundamental in nature and thus applicable to a broad range of hybrid photovoltaic and photocatalytic materials and interfaces. The book will focus on the dynamic aspects of the electron injection, exciton and carrier relaxation processes, as well as coherence effects, which continue to provide the impetus and the greatest challenge for the development of new methodologies.
Book Synopsis Photoinduced Electron Transfer Processes of Semiconductor Quantum Dots in Confined Media by : Clifton T. Harris
Download or read book Photoinduced Electron Transfer Processes of Semiconductor Quantum Dots in Confined Media written by Clifton T. Harris and published by . This book was released on 2011 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optical Studies of Semiconductor Quantum Dots by : Christine Ann Smith
Download or read book Optical Studies of Semiconductor Quantum Dots written by Christine Ann Smith and published by . This book was released on 1996 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photoluminescence Studies of Semiconductor Quantum Dots and Their Application in Bioimaging by :
Download or read book Photoluminescence Studies of Semiconductor Quantum Dots and Their Application in Bioimaging written by and published by . This book was released on 2005 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effects of ligands on the emission properties CdSe and InP QDs are studied and a concentration based increase in efficiency by the addition of ligands was identified. A ligand based charge transfer from quantum dots had been explained. Photo-induced Photoluminescence enhancement in CdSe and CdSe/ZnS QDs out of the reaction mixture was studied for the first time and the possibility of a new mechanism that do not involve the surface modification is determined. Targeting and internalization of III/V semiconductor quantum dot folic acid conjugate was successfully carried out using microscopic and spectroscopic techniques. Demonstration of two - photon microscopy with InP quantum dots has also been reported.
Book Synopsis Principles of Quantum Dot Photoexcited Charge Transfer by : Tina Xin Ding
Download or read book Principles of Quantum Dot Photoexcited Charge Transfer written by Tina Xin Ding and published by . This book was released on 2016 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photoexcited charge transfer is essential to light energy conversion processes in photosynthesis and solar cells. While fundamental theories governing these molecular and bulk charge transfer reactions are well established, the same level of understanding and agreement for nanoscale systems has not been achieved. It is essential to address this knowledge gap, as nanomaterials are becoming attractive candidates for optoelectronics and electrocatalysis. In this dissertation, hole transfer from high photoluminescence quantum yield CdSe-core CdS-shell semiconductor nanocrystal quantum dots to covalently linked molecular ferrocene acceptors is investigated in the context of Marcus Theory of Electron Transfer (Nobel Prize Chemistry 1992). This model quantum dot donor-acceptor system was thoughtfully designed to address the unique properties of QDs that complicate the proper characterization of the rate constants. In this model system, modulating the electronic coupling and thermodynamic driving force for the reaction was done reliably and the hole transfer rate constant per acceptor, kht, was extracted by measuring steady-state and transient photoluminescence to determine the photoluminescence quantum yield in conjunction with quantitative NMR to determine the number of bound acceptors. Our studies varied the electronic coupling by six orders of magnitude by changing the shell thickness and the alkyl chain length. We find that there is a family of universal curves for PLQY as a function of coverage, spanning linear to nonlinear which depends critically on the ratio of the total hole transfer rate to the sum of the native recombination rates in the QD. Thermodynamic driving force was explored by molecular functionalizations on ferrocene that change the oxidation potentials of the acceptor. The rate's dependence on the driving force elucidated that there is no Marcus inverted region, and a new multistate model was posited to explain the result. Parameters that affect the reorganization energy such as the surface ligands were also explored. Our model charge transfer system allowed us to examine the rate of ligand exchange to determine the rate law and the rate order, and explore mechanisms of this exchange reaction. Single particle absorption and photoluminescence via fluorescence and photothermal microscopy were also explored to explore photophysical properties of single QDs, such as how its photoluminescence and absorption degrades over time and how the photoluminescence quantum yield varies in a given batch of this material.
Book Synopsis Coherent Transient Nonlinear Optical Spectroscopic Studies of Single Semiconductor Quantum Dots by : Xiaoqin Li
Download or read book Coherent Transient Nonlinear Optical Spectroscopic Studies of Single Semiconductor Quantum Dots written by Xiaoqin Li and published by . This book was released on 2003 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantum Dot Photodetectors by : Xin Tong
Download or read book Quantum Dot Photodetectors written by Xin Tong and published by Springer Nature. This book was released on 2021-09-17 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive overview of state-of-the-art quantum dot photodetectors, including device fabrication technologies, optical engineering/manipulation strategies, and emerging photodetectors with building blocks of novel quantum dots (e.g. perovskite) as well as their hybrid structured (e.g. 0D/2D) materials. Semiconductor quantum dots have attracted much attention due to their unique quantum confinement effect, which allows for the facile tuning of optical properties that are promising for next-generation optoelectronic applications. Among these remarkable properties are large absorption coefficient, high photosensitivity, and tunable optical spectrum from ultraviolet/visible to infrared region, all of which are very attractive and favorable for photodetection applications. The book covers both fundamental and frontier research in order to stimulate readers' interests in developing novel ideas for semiconductor photodetectors at the center of future developments in materials science, nanofabrication technology and device commercialization. The book provides a knowledge sharing platform and can be used as a reference for researchers working in the fields of photonics, materials science, and nanodevices.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Nanoscience and Technology by :
Download or read book Comprehensive Nanoscience and Technology written by and published by Academic Press. This book was released on 2010-10-29 with total page 2785 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the Introduction: Nanotechnology and its underpinning sciences are progressing with unprecedented rapidity. With technical advances in a variety of nanoscale fabrication and manipulation technologies, the whole topical area is maturing into a vibrant field that is generating new scientific research and a burgeoning range of commercial applications, with an annual market already at the trillion dollar threshold. The means of fabricating and controlling matter on the nanoscale afford striking and unprecedented opportunities to exploit a variety of exotic phenomena such as quantum, nanophotonic and nanoelectromechanical effects. Moreover, researchers are elucidating new perspectives on the electronic and optical properties of matter because of the way that nanoscale materials bridge the disparate theories describing molecules and bulk matter. Surface phenomena also gain a greatly increased significance; even the well-known link between chemical reactivity and surface-to-volume ratio becomes a major determinant of physical properties, when it operates over nanoscale dimensions. Against this background, this comprehensive work is designed to address the need for a dynamic, authoritative and readily accessible source of information, capturing the full breadth of the subject. Its six volumes, covering a broad spectrum of disciplines including material sciences, chemistry, physics and life sciences, have been written and edited by an outstanding team of international experts. Addressing an extensive, cross-disciplinary audience, each chapter aims to cover key developments in a scholarly, readable and critical style, providing an indispensible first point of entry to the literature for scientists and technologists from interdisciplinary fields. The work focuses on the major classes of nanomaterials in terms of their synthesis, structure and applications, reviewing nanomaterials and their respective technologies in well-structured and comprehensive articles with extensive cross-references. It has been a constant surprise and delight to have found, amongst the rapidly escalating number who work in nanoscience and technology, so many highly esteemed authors willing to contribute. Sharing our anticipation of a major addition to the literature, they have also captured the excitement of the field itself in each carefully crafted chapter. Along with our painstaking and meticulous volume editors, full credit for the success of this enterprise must go to these individuals, together with our thanks for (largely) adhering to the given deadlines. Lastly, we record our sincere thanks and appreciation for the skills and professionalism of the numerous Elsevier staff who have been involved in this project, notably Fiona Geraghty, Megan Palmer and Greg Harris, and especially Donna De Weerd-Wilson who has steered it through from its inception. We have greatly enjoyed working with them all, as we have with each other.
