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A Study On Long Term Stability Of Quantum Dot Sensitized Solar Cells
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Book Synopsis A Study on Long Term Stability of Quantum Dot Sensitized Solar Cells by : Hao Yu
Download or read book A Study on Long Term Stability of Quantum Dot Sensitized Solar Cells written by Hao Yu and published by . This book was released on 2014 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum dot sensitized solar cells (QDSSCs) are recognized as a promising new technology for making cost efficient photovoltaic devices. In this project, QDSSCs are based on CdSe quantum dots (QDs) attached to ternary zinc tin oxide (ZTO) nanowires. Ternary oxides are of interest because they afford a wide latitude for compositional tuning of semiconductor properties. In any device that is to be subjected to the conditions of field deployment, the long term stability of all components of the device must be assured. Processes such as QD detachment or QD-nanowire dissolution and corrosion might significantly degrade solar cell performance over time. In this dissertation, stability aspects of QDSSCs are examined in detail, from the dissolution and alteration of ternary oxide materials to the attachment, detachment and dissolution of QDs on oxide surfaces. We find that ZTO is likely to survive long-term deployment, but that small amounts of surface alteration will take place. More importantly, solution-based QDs capped with organic stabilizing molecules demonstrate ligand-dependent attachment and detachment behaviors but are less prone to dissolution. Pulsed laser deposited QDs, however, are prone to longer-term dissolution. Post-deposition capping molecules could improve stability but might inhibit electron transfer. Long-term QDSSC stability is a balance between protection of key materials but avoiding inhibition of electron transfer needed for solar cell operation.
Book Synopsis The Stability of PbS Quantum Dot Solar Cells by : Melany Christine Sponseller
Download or read book The Stability of PbS Quantum Dot Solar Cells written by Melany Christine Sponseller and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, we systematically investigate aging processes that lead to QD solar cell performance evolution during short-term shelf storage and long-term continuous operation. First, we analyze the role of short-term air exposure in improving the initial efficiency of PbS QD solar cells. We show that brief air exposure treatments elicit multiple oxidation processes that benefit PbS QD solar cell performance in the near-term. In particular, post-fabrication air exposure is necessary to heal the QD-top electrode interface following thermal evaporation of electrodes onto QDs.
Book Synopsis Long-term Stability and Efficiency of Dye-sensitized Solar Cells by : A. Hinsch
Download or read book Long-term Stability and Efficiency of Dye-sensitized Solar Cells written by A. Hinsch and published by . This book was released on 2001 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Toward Efficient and Stable Quantum Dot Solar Cells by : Chia-Hao Marcus Chuang
Download or read book Toward Efficient and Stable Quantum Dot Solar Cells written by Chia-Hao Marcus Chuang and published by . This book was released on 2016 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the optical and electronic properties of lead sulfide (PbS) quantum dots (QDs) for the development of QD solar cells. Near-infrared active PbS QDs composed of earth-abundant elements have emerged as promising candidates for photovoltaic applications because of the solution-processability and a tunable energy bandgap that covers the optimal bandgap range for single and multi-junction solar cells. However, despite rapid progress, previous QD solar cells still show unsatisfactory efficiency and stability. In this thesis work, room-temperature solution-processed ZnO/PbS solar cells with high efficiencies and unprecedented air-stability have been successfully demonstrated. The major limiting factors in present QD solar cells and potential routes to further improving the device performance have also been elucidated. Owing to the versatile surface chemistry and high surface-to-volume ratio of QDs, the surface ligands play crucial roles in determining the optoelectronic properties. In this work, taking advantage of tunable electronic energy levels in QDs with different ligands, a new device architecture for solar cells has been designed. The architecture employs layers of QDs serving complementary functions, one as the main light absorbing layer and another as an electron-blocking/hole extraction layer. The device shows improved performance as a result of the relative band alignment between these QD layers, as confirmed by ultraviolet photoelectron spectroscopy. A device with this architecture reached a certified efficiency of 8.55 %, breaking previous record efficiencies of QD solar cells. The device stability has been significantly improved in this work by identifying two key factors that limit the device stability. One key factor is the choice of ligands. It was found that iodide-passivated QDs are stable in air, while organic ligand passivated QDs are prone to oxidation. Another important factor is the removal of the commonly used MoO3 interfacial layer, which gradually develops an unfavorable band alignment in the device with air exposure time. Understanding these degradation mechanisms leads to a successful demonstration of air-stable QD solar cells. The devices not only show high efficiency but also exhibit excellent long-term stability in air for more than 150 days without any encapsulation. The origins of the large open-circuit voltage (VOC) deficit, a primary limiting factor in present QD solar cells, have also been investigated through a combination of device physics and spectroscopic studies. Radiative sub-bandgap states with emission peak ~0.23 eV lower than the band-edge emission are found in QD solar cells. This energy difference is consistent with the below-bandgap activation energy for diode current generation obtained from current-voltage characteristics at different temperatures. It is concluded that the VOC of present QD solar cells is mainly limited by the sub-bandgap states rather than the interfaces between QDs and other materials. The origin of sub-bandgap states was further found to be most likely from undercharged Pb atoms on the QD surface (off-stoichiometry). Lastly, based on the findings in this thesis work, possible future directions that could further improve the efficiency of QD solar cells are discussed.
Download or read book Polymer Electrolytes written by Tan Winie and published by John Wiley & Sons. This book was released on 2020-02-18 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive overview of the main characterization techniques of polymer electrolytes and their applications in electrochemical devices Polymer Electrolytes is a comprehensive and up-to-date guide to the characterization and applications of polymer electrolytes. The authors ? noted experts on the topic ? discuss the various characterization methods, including impedance spectroscopy and thermal characterization. The authors also provide information on the myriad applications of polymer electrolytes in electrochemical devices, lithium ion batteries, supercapacitors, solar cells and electrochromic windows. Over the past three decades, researchers have been developing new polymer electrolytes and assessed their application potential in electrochemical and electrical power generation, storage, and conversion systems. As a result, many new polymer electrolytes have been found, characterized, and applied in electrochemical and electrical devices. This important book: -Reviews polymer electrolytes, a key component in electrochemical power sources, and thus benefits scientists in both academia and industry -Provides an interdisciplinary resource spanning electrochemistry, physical chemistry, and energy applications -Contains detailed and comprehensive information on characterization and applications of polymer electrolytes Written for materials scientists, physical chemists, solid state chemists, electrochemists, and chemists in industry professions, Polymer Electrolytes is an essential resource that explores the key characterization techniques of polymer electrolytes and reveals how they are applied in electrochemical devices.
Book Synopsis Sustainable Materials for Next Generation Energy Devices by : Kuan Yew Cheong
Download or read book Sustainable Materials for Next Generation Energy Devices written by Kuan Yew Cheong and published by Elsevier. This book was released on 2020-12-01 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sustainable Materials for Next Generation Energy Devices: Challenges and Opportunities presents the latest state-of-the-art knowledge and innovation related to environmentally-friendly functional materials that can be developed for, and employed in, producing a feasible next generation of energy storage and conversion devices. The book is broken up into three sections, covering Energy Storage, Energy Conversion and Advanced Concepts. It will be an important reference for researchers, engineers and students who want to gain extensive knowledge in green and/or sustainable functional materials and their applications. Provides a concise resource for readers interested in sustainable and green functional materials for energy conversion and storage devices Emphasizes sustainable and green concepts in the design of energy devices based on renewable functional materials Presents a survey of both the challenges and opportunities available for renewable functional materials in the development of energy devices
Book Synopsis Advances in Nanotechnology Research and Application: 2013 Edition by :
Download or read book Advances in Nanotechnology Research and Application: 2013 Edition written by and published by ScholarlyEditions. This book was released on 2013-06-21 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Nanotechnology Research and Application: 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about Atomic Layer Deposition. The editors have built Advances in Nanotechnology Research and Application: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Atomic Layer Deposition in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Advances in Nanotechnology Research and Application: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Book Synopsis Springer Handbook of Inorganic Photochemistry by : Detlef Bahnemann
Download or read book Springer Handbook of Inorganic Photochemistry written by Detlef Bahnemann and published by Springer Nature. This book was released on 2022-06-25 with total page 1914 pages. Available in PDF, EPUB and Kindle. Book excerpt: The handbook comprehensively covers the field of inorganic photochemistry from the fundamentals to the main applications. The first section of the book describes the historical development of inorganic photochemistry, along with the fundamentals related to this multidisciplinary scientific field. The main experimental techniques employed in state-of-art studies are described in detail in the second section followed by a third section including theoretical investigations in the field. In the next three sections, the photophysical and photochemical properties of coordination compounds, supramolecular systems and inorganic semiconductors are summarized by experts on these materials. Finally, the application of photoactive inorganic compounds in key sectors of our society is highlighted. The sections cover applications in bioimaging and sensing, drug delivery and cancer therapy, solar energy conversion to electricity and fuels, organic synthesis, environmental remediation and optoelectronics among others. The chapters provide a concise overview of the main achievements in the recent years and highlight the challenges for future research. This handbook offers a unique compilation for practitioners of inorganic photochemistry in both industry and academia.
Book Synopsis Long-term Stability of Dye-sensitised Solar Cells by : A. Hinsch
Download or read book Long-term Stability of Dye-sensitised Solar Cells written by A. Hinsch and published by . This book was released on 2001 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Emerging Materials for Sustainable Energy by : Naveen V. Kulkarni
Download or read book Handbook of Emerging Materials for Sustainable Energy written by Naveen V. Kulkarni and published by Elsevier. This book was released on 2024-02-28 with total page 1034 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Emerging Materials for Sustainable Energy provides a comprehensive accounting on the fundamentals, current developments, challenges and future prospects of emerging materials for the development of sustainable energy. Each chapter addresses a distinct and important area within the energy field and includes comprehensive data to support the materials being presented. Sections cover Batteries, Capacitors and Supercapacitors, Fuel cells, Thermoelectrics, Novel illumination sources and techniques, Photovoltaics & Solar cells, Alternative energy sources, hydrogen as an energy source, including hydrogen production and fuel generation, the use of Biofuels and Carbon dioxide. The book concludes with three chapters related to advanced materials under development for energy conservation and environmental protection, including theories, methodologies and simulations established for advanced materials. Covers a broad scope of advanced materials that have been developed for energy and environmental sustainability Provides detailed and updated information about the structural and functional features of various emerging materials and their multifaceted applications Includes supplementary data alongside each chapter
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 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 Solvents—Advances in Research and Application: 2012 Edition by :
Download or read book Solvents—Advances in Research and Application: 2012 Edition written by and published by ScholarlyEditions. This book was released on 2012-12-26 with total page 984 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solvents—Advances in Research and Application: 2012 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Solvents. The editors have built Solvents—Advances in Research and Application: 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Solvents in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Solvents—Advances in Research and Application: 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Book Synopsis LOTS-DSC by : Johannes Martinus Kroon
Download or read book LOTS-DSC written by Johannes Martinus Kroon and published by . This book was released on 2001 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural-electronic Properties Correlation of CdSe Quantum Dot Solar Cell Using Experimental and Theoretical Investigations by : Saifful Kamaluddin Muzakir
Download or read book Structural-electronic Properties Correlation of CdSe Quantum Dot Solar Cell Using Experimental and Theoretical Investigations written by Saifful Kamaluddin Muzakir and published by . This book was released on 2015 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar cells are in focus for decades due to their capability to convert solar energy into electrical energy. Quantum dots sensitized solar cell (QDSC), in which the photovoltaic (PV) effect occurs at the interface between a quantum dot (QD) conjugated wide band gap metal oxide semiconductor (MOS) and a redox electrolyte, gained much consideration due to their relatively simpler device structure and similarity to dye sensitized solar cell (DSSC), in which dye molecules replace QDs. The QDs are potentially having larger absorption cross-section, tuneable band edges, and atomic-like energy levels. These salient features make QDs capable of delivering more than one electron per single absorbed photon of sufficient energy, a phenomenon known as multi-exciton generation (MEG). The MEG effect makes QDSCs capable of achieving PV conversion efficiency (PCE) as high as 60% theoretically. Despite the remarkable feature of QDs as a light absorber, QDSCs deliver much inferior practical PCE (~8.6 %). Besides, they show inferior PCE compared to DSSCs (~13%). Therefore, this doctoral research aims to establish the structure-property correlation in QDSCs. A combination of experimental results and quantum chemical calculations under the framework of density functional theory (DFT) was employed for this purpose. In this approach, firstly CdSe QDs were synthesized using chemical methods and studied their structure and properties. Secondly realistic cluster models were empirically developed using DFT and experimental results. The structure-property correlation was established by comparing the experimental and theoretical results. The calculated absorption crosssection, band edges, band gaps, and emitting states of QDs with and without surface ligands were compared with that of RuL2(NCS)2.2H2O; L = 2,2'-bipyridyl-4,4'- dicarboxylic acid (N3) dye to correlate the capability of light absorption of QDs or dye molecules on the overall performance of device. This procedure was adopted to (i) understand the fundamental differences of electronic states in the bare QDs and the dye structures and (ii) evaluate electron channelling in QDs-ligand conjugate thus correlating with electron injection efficiency from QDs to MOS. Five parameters were concluded to have distinct effects on the PV properties of QDSCs. They are (i) emitting states of QDs, (ii) ligand usage, (iii) QDs size distribution, (iv) absorption cross-section, and (v) redox potential of electrolyte. The QDs-MOS conjugates were chemically developed and spectroscopically demonstrated efficient electron injection from QDs to MOS. However, such structures raised serious concerns on long term stability under operating conditions. This thesis finally propose future possible methodologies for stable and efficient QDSCs.
Book Synopsis Ferroelectric Materials for Energy Applications by : Haitao Huang
Download or read book Ferroelectric Materials for Energy Applications written by Haitao Huang and published by John Wiley & Sons. This book was released on 2019-01-04 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a comprehensive overview of the emerging applications of ferroelectric materials in energy harvesting and storage Conventional ferroelectric materials are normally used in sensors and actuators, memory devices, and field effect transistors, etc. Recent progress in this area showed that ferroelectric materials can harvest energy from multiple sources including mechanical energy, thermal fluctuations, and light. This book gives a complete summary of the novel energy-related applications of ferroelectric materials?and reviews both the recent advances as well as the future perspectives in this field. Beginning with the fundamentals of ferroelectric materials, Ferroelectric Materials for Energy Applications offers in-depth chapter coverage of: piezoelectric energy generation; ferroelectric photovoltaics; organic-inorganic hybrid perovskites for solar energy conversion; ferroelectric ceramics and thin films in electric energy storage; ferroelectric polymer composites in electric energy storage; pyroelectric energy harvesting; ferroelectrics in electrocaloric cooling; ferroelectric in photocatalysis; and first-principles calculations on ferroelectrics for energy applications. -Covers a highly application-oriented subject with great potential for energy conversion and storage applications. -Focused toward a large, interdisciplinary group consisting of material scientists, solid state physicists, engineering scientists, and industrial researchers -Edited by the "father of integrated ferroelectrics" Ferroelectric Materials for Energy Applications is an excellent book for researchers working on ferroelectric materials and energy materials, as well as engineers looking to broaden their view of the field.
Book Synopsis Emerging Energy Materials by : Govind Nair
Download or read book Emerging Energy Materials written by Govind Nair and published by CRC Press. This book was released on 2024-03-14 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Emerging Energy Materials: Applications and Challenges guides the reader through materials used in progressive energy systems. It tackles their use in energy storage across solar, bio, geothermal, wind, fossil, hydrogen, nuclear, and thermal energy. Specific chapters are dedicated to energy reaping systems currently in development. This book contributes to the current literature by highlighting concerns that are frequently overlooked in energy materials textbooks. Awareness of these challenges and contemplation of possible solutions is critical for advancing the field of energy material technologies. Key features: Provides up-to-date information on the synthesis, characterization, and a range of applications using various physical and chemical methods Presents the latest advances in future energy materials and technologies subjected to specific applications Includes applied illustrations, references, and advances in order to explain the challenges and trade-offs in the field of energy material research and development Includes coverage of solar cell and photovoltaic, hydro power, nuclear energy, fuel cell, battery electrode, supercapacitor and hydrogen storage applications This book is a timely reference for researchers looking to improve their understanding of emerging energy materials, as well as postgraduate students considering a career within materials science, renewable energy and materials chemistry.
