Download or read book Intriguing Optoelectronic Properties of Metal Halide Perovskites written by and published by . This book was released on 2016 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, a new chapter in the long and distinguished history of perovskites is being written with the breakthrough success of metal halide perovskites (MHPs) as solution-processed photovoltaic (PV) absorbers. The current surge in MHP research has largely arisen out of their rapid progress in PV devices; however, these materials are potentially suitable for a diverse array of optoelectronic applications. Like oxide perovskites, MHPs have ABX3 stoichiometry, where A and B are cations and X is a halide anion. Here, the underlying physical and photophysical properties of inorganic (A = inorganic) and hybrid organic-inorganic (A = organic) MHPs are reviewed with an eye toward their potential application in emerging optoelectronic technologies. Significant attention is given to the prototypical compound methylammonium lead iodide (CH3NH3PbI3) due to the preponderance of experimental and theoretical studies surrounding this material. We also discuss other salient MHP systems, including 2- dimensional compounds, where relevant. More specifically, this review is a critical account of the interrelation between MHP electronic structure, absorption, emission, carrier dynamics and transport, and other relevant photophysical processes that have propelled these materials to the forefront of modern optoelectronics research.

Download or read book Metal Halide Perovskite Semiconductors written by Wanyi Nie and published by Springer Nature. This book was released on 2023-04-20 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will provide readers with a good overview of some of most recent advances in the field of technology for perovskite materials. There will be a good mixture of general chapters in both technology and applications in opto-electronics, Xray detection and emerging transistor structures. The book will have an in-depth review of the research topics from world-leading specialists in the field. The authors build connections between the materials’ physical properties to the main applications such as photovoltaics, LED, FETs and X-ray sensors. They also discuss the similarities and main differences when using perovskites for those devices.

Download or read book Structural and Optoelectronic Properties of Heterogeneous Metal halide Perovskites from First Principles written by Raisa-Ioana Biega and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electronic Properties of Metal Halide Perovskites Surfaces written by Fengyu Zhang and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past decade, metal halide perovskites have attracted tremendous attention in the field of photovoltaics and light emission due to their superb optoelectronic properties and potentially low manufacturing costs. Perovskite solar cells have shown remarkable progress in recent years with rapid increases in power conversion efficiency, from reports of about 3% in 2009 to over 25% in 2020, making it the fastest improving solar cell technology in history. The understanding of surface and interface properties plays a very important role in the design of high-efficiency solar cells. To advance the development of such devices, the ability to understand, control and manipulate surface and interface properties is essential.The work presented in this thesis investigates the challenges and rewards of characterizing metal halide perovskite surfaces with high sensitivity measurements, such as Kelvin probe contact potential difference and photoemission spectroscopy measurements. We show the loss of halide species from the perovskite surfaces upon supra-gap illumination in vacuum, which causes both a long-term alteration of the surface and a modification of the Kelvin probe tip during measurement. These changes, if undetected, lead to a misinterpretation of the perovskite surface potential. In addition, we illustrated the difficulties in determining the density of states (DOS) in the valence band and at the valence band maximum (VBM) of these lead halide perovskite surfaces with ultraviolet photoemission spectroscopy. Our results stress the importance of taking into account the low DOS at the valence band edge and highlight issues such as film degradation, non-equilibrium situations under light, and the importance of removing all parasitic contributions to the photoemission spectra. We developed strategies that help to accurately measure the electronic structure of perovskite surfaces, with which we demonstrate the measurement of electronic gap states above the VBM of some perovskites. These results establish the link between these potentially detrimental gap states and an additive commonly mixed in the perovskite precursor solution. Finally, we review our previous work on molecular doping and demonstrate the surface doping of perovskites with molecular reductants and oxidants.

Download or read book Metal Halide Perovskite Crystals Growth Techniques Properties and Emerging Applications written by Wei Zhang and published by MDPI. This book was released on 2019-01-31 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Metal Halide Perovskite Crystals: Growth Techniques, Properties and Emerging Applications" that was published in Crystals

Download or read book Metal Halide Perovskites Synthesis Properties And Applications written by Jin Zhong Zhang and published by World Scientific. This book was released on 2023-03-14 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal halide perovskites are the hottest materials currently.This unique compendium covers systematically the fundamental aspects of synthesis, properties, and applications of metal halide perovskites that exhibit unique properties and useful functionalities.Written for beginners and practitioners, this useful reference text provides a good balance between fundamental concepts/principles and related recent researches with many highlighted examples.This volume benefits researchers, practitioners, graduate students in materials chemistry/nanochemistry, physical chemistry and semiconductors.

Download or read book Halide Perovskites written by Tze-Chien Sum and published by John Wiley & Sons. This book was released on 2019-03-25 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Single Crystal Metal Halide Perovskites Electronics written by Yusheng Lei and published by . This book was released on 2020 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal halide perovskites have demonstrated tremendous promising electronic and optoelectronic properties that make them appealing in various device applications. Even though surprising improvement has been achieved during the past few years in polycrystalline perovskite-based devices, problems of their intrinsic high defects level, existence of grain boundaries, strong ion migration rates, and poor stabilities can heavily hinder the further development of polycrystalline perovskite electronics and their realistic applications. In contrast, their single-crystal counterpart is well-studied to have much better crystalline qualities, enhanced electrical properties, and excellent material stabilities, making them intriguing for reaching advanced device performance and realistic applications. However, the development of single-crystal perovskite electronic devices is still in its infancy; even the controlling over dimensions, scalabilities, morphologies, and compositions on single-crystal perovskites, are still challenging. Based on those motivations, this research aims to develop a general platform for realizing single-crystal metal halide perovskites electronics from the material growth to the thin-film device fabrication. The solution-based chemical epitaxy method, the lithography and etching approaches, and the transfer printing processes will be combined together to form this fabrication protocol, which is also compatible with the conventional semiconductor processes. In Chapter One, the basic properties of metal halide perovskites and the current problems presented in this field will be introduced and discussed. In Chapter Two, an epitaxial growth method of metal halide perovskite will be introduced. Our work presents the first controllable growth of single-crystal perovskites with different dimensions, morphologies, crystalline orientations, and compositions. In Chapter Three, a general fabrication process for metal halide single-crystal perovskite electronic integrations will be introduced. Our work presents a reliable approach to integrate metal halide single-crystal perovskite into electronics/microelectronics. In Chapter Four, a general strategy for fabricating flexible metal halide single-crystal perovskite electronics will be introduced. Our work presents the first realization of flexible single-crystal perovskite electronics/micro-electronics, which paves the way for realizing high-performance single-crystal metal halide perovskites wearable electronics.

Download or read book Metal Halide Perovskite Crystals Growth Techniques Properties and Emerging Applications written by Wei Zhang and published by . This book was released on 2019 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, metal halide perovskites have emerged as a rising star among semiconductor materials owing to their low cost, solution processability, and fascinating combination of material properties enabling a broad range of energy applications. Accompanied by the unprecedented success in the photovoltaic community, which has witnessed a certified power conversion efficiency of 23.7%, rapid advancement has also been achieved in the areas of light-emitting diodes, lasers, photodetectors, and solar-to-fuel energy conversion devices. Beyond the dominant format of polycrystalline perovskite thin films for solar cell applications, recent progress in metal halide perovskite crystals, ranging from nanocrystals to macroscopic single-crystals, has spurred a great deal of both scientific and industrial interest. Great research efforts have endeavored to develop new techniques for crystal growth and investigate the physical and chemical properties of the materials and explore their emerging applications. These exciting achievements call for a rationalization of the different forms of perovskite semiconductors beyond the widely used polycrystalline thin films. In the current Special Issue, "Metal Halide Perovskite Crystals: Growth Techniques, Properties and Emerging Applications", we aim to provide a forum for the discussion and presentation of recent advances in the fields of research related to metal halide perovskite crystals.

Download or read book Metal Halide Perovskite Nanostructures for Optoelectronic Applications and Fundamental Studies written by Yongping Fu and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-resolved photoluminescence studies of individual heterostructures reveal internal energy transfer with a timescale of hundreds of picoseconds from lower-[n] to higher-[n] layers (high bandgap to low bandgap). These heterostructures capable of emitting multiple colors with high spectral purity are attractive platforms to explore new properties and physics in 2D materials. They also show promise for building versatile photonic devices that are easily solution-processed. The following appendices provide complementary information to the accomplished work presented in the main chapters. Specifically, Appendix A-H provide additional figures and tables to Chapters 2-9, respectively. Appendix I describes electrically driven light emission from 1D NWs and 2D nanoplates of cesium lead halide perovskites The remarkable solar performance of lead halide perovskites has been attributed to their advantageous physical properties that present many mysteries, challenges, as well as opportunities. The body of thesis here has demonstrated better control over the crystal growth and rational design of nanostructures of these fascinating materials, as well as better understanding of their complex solid-state chemistry can further enhance their applications. Moreover, the excellent properties of these single-crystal perovskite nanostructures (and their heterostructures) of diverse families of perovskite materials with different cations, anions, and dimensionality make them ideal for fundamental physical studies of carrier transport and decay mechanisms, and for enabling high performance optoelectronic applications, such as NW lasers.

Download or read book Metal Halide Perovskites for Generation Manipulation and Detection of Light written by Juan P. Martínez-Pastor and published by Elsevier. This book was released on 2023-07-20 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Halide Perovskites for Generation, Manipulation and Detection of Light covers the current state and future prospects of lead halide perovskite photonics and photon sources, both from an academic and industrial point-of-view. Advances in metal halide perovskite photon sources (lasers) based on thin films, microcrystals and nanocrystals are comprehensively reviewed, with leading experts contributing current advances in theory, fundamental concepts, fabrication techniques, experiments and other important research innovations. This book is suitable for graduate students, researchers, scientists and engineers in academia and R&D in industry working in the disciplines of materials science and engineering. - Includes comprehensive reviews from academic and industrial perspectives of current trends in the field of metal halide perovskite for photonics - Provides an up-to-date look at the most recent and upcoming applications in metal halide perovskite photonics, such as; photodetectors, lighting, lasing, nonlinear photonics and quantum technologies - Discusses future prospective trends and envisioned applications of metal halide perovskites, from near-UV to near-IR photonics

Download or read book The Optoelectronic Diversity of Layered Halide Perovskites written by Matthew David Smith and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The path towards emergent photophysics and new technologically desirable physical properties lies through synthesis of new materials. A powerful framework for developing such materials is the idea of hybrids, which contain both organic and inorganic components in a single chemical compound. These two building blocks each offer advantages compared to the other. The ability to design organic molecules with exact precision over atomic connectivity and elemental specificity is unmatched, while inorganic building units contribute increased robustness and intriguing optoelectronic properties. Additionally, the differing reactivities and stabilities of these components dictates simple and mild synthetic conditions such as solution-state self-assembly, allowing easy access to a diverse phase space of possible materials. I have explored how organic-inorganic hybrid materials contain both striking similarities and drastic departures from the optoelectronic properties of their separate components, particularly evident in the family of layered lead-halide hybrids. Much of my focus centers on understanding and controlling the behavior of excitons in the inorganic layers of the two-dimensional lead-halide perovskites. Using a combination of in situ optical spectroscopy and X-ray diffraction techniques, I demonstrated how reversible intercalation of polarizable species such as the molecular dihalogens, such as iodine, can tune the degree of electronic confinement without altering the structure of the inorganic layers in which excitons are confined. More reactive halogens react with the perovskite to perform unusual chemistry with both the organic and inorganic layers. Room-temperature white-light photoluminescence is a rare phenomenon exhibited by certain layered lead-halide perovskites. I initially helped elucidate the photoluminescence mechanism, which I ascribed to the radiative recombination of self-trapped excitons. I further demonstrated that this broad emission is not restricted to a few members of the halide perovskite family, but rather is common to all layered lead-chloride and lead-bromide perovskites, although this emission is highly temperature dependent. With variable-temperature photoluminescence and single-crystal X-ray diffraction, I established correlations between the propensity to exhibit broad photoluminescence at a given temperature and particular octahedral tilts of the lead-bromide octahedra, and provided further support for the self-trapped exciton hypothesis. With additional both static and time-resolved temperature-dependent optical spectroscopies, I found that self-trapped excitons are pervasive in the lead-bromide perovskites, even when the broad photoluminescence is not visible, suggesting a persistent pathway for non-radiative recombination that limits quantum efficiency. Finally, I extended the phenomenon of broadband photoluminescence beyond the layered perovskites to the class of lead-halide hybrids generally. I synthesized and characterized both layered and zero-dimensional lead-bromide hybrids templated by sulfonium-based cations that exhibit room-temperature broad red emission.

Download or read book Halide Perovskite Semiconductors written by Yuanyuan Zhou and published by John Wiley & Sons. This book was released on 2023-12-22 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: Halide Perovskite Semiconductors Enables readers to acquire a systematic and in-depth understanding of various fundamental aspects of halide perovskite semiconductors Halide Perovskite Semiconductors: Structures, Characterization, Properties, and Phenomena covers the most fundamental topics with regards to halide perovskites, including but not limited to crystal/defect theory, crystal chemistry, heterogeneity, grain boundaries, single-crystals/thin-films/nanocrystals synthesis, photophysics, solid-state ionics, spin physics, chemical (in)stability, carrier dynamics, hot carriers, surface and interfaces, lower-dimensional structures, and structural/functional characterizations. Included discussions on the fundamentals of halide perovskites aim to expand the basic science fields of physics, chemistry, and materials science. Edited by two highly qualified researchers, Halide Perovskite Semiconductors includes specific information on: Crystal/defect theory of halide perovskites, crystal chemistry of halide perovskites, and processing and microstructures of halide perovskites Single-crystals of halide perovskites, nanocrystals of halide perovskites, low-dimensional perovskite crystals, and nanoscale heterogeneity of halide perovskites Carrier mobilities and dynamics in halide perovskites, light emission of halide perovskites, photophysics and ultrafast spectroscopy of halide perovskites Hot carriers in halide perovskites, correlating photophysics with microstructures in halide perovskites, chemical stability of halide perovskites, and solid-state ionics of halide perovskites Readers can find solutions to technological issues and challenges based on the fundamental knowledge gained from this book. As such, Halide Perovskite Semiconductors is an essential in-depth treatment of the subject, ideal for solid-state chemists, materials scientists, physical chemists, inorganic chemists, physicists, and semiconductor physicists.

Download or read book Hybrid Perovskite Solar Cells written by Hiroyuki Fujiwara and published by John Wiley & Sons. This book was released on 2022-01-10 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Metal Halide Perovskites and Perovskite Related Hybrids for Blue and White Light Emitting Diodes written by Michael Debebe Worku and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal halide perovskites have received significant attention in the past decade as a promising class of material for energy harvesting, light emission and detection as well as various other solid-state devices. The easy solution processability, high defect tolerance, abundance of raw materials and exceptional optoelectronic properties have warranted intense investigation into their fundamental material physics and their device integration. Particularly, metal halide perovskite light-emitting diodes (LEDs) are thought to hold promise for next generation displays due to their narrow and tunable emission, high radiative efficiency and easy processability. For instance, red and green perovskite LEDs have now achieved the high external quantum efficiency required for commercial applications, on par with more mature lighting technologies such as organic LEDs and quantum dot LEDs. However, there are still several roadblocks that need to be overcome before perovskite LEDs can be considered a commercially viable technology. These challenges include, device stability, material toxicity, mass-production and development of efficient blue LEDs. The development of efficient blue LEDs is a major milestone in any display technology as it allows the production of multi-color images by combining the three primary colors red, green and blue (RGB). Similarly, the development of efficient white LEDs with excellent white light quality displaying high color rendering indices is also as important for solid-state lighting applications. In this dissertation, we explore two major themes related to the use of perovskites and perovskite related metal halide hybrids in light-emitting applications. The first and the broader work involves the study of various strategies to enable the realization of efficient blue perovskite LEDs. Three of the main challenges in obtaining efficient blue perovskite LEDs have been identified as band gap and emission tuning, poor radiative efficiency of perovskite blue emitters and charge carrier imbalance that results in suboptimal device performance. These issues are addressed in the first theme of this dissertation by introducing effective band gap and emission tuning strategies, improving radiative efficiency of blue perovskite emitters through trap passivation and engineering the energy band edges of perovskite thin films to obtain favorable band alignment and enhanced charge balance. In this theme, two methods are presented in chapter 2 and 3 to achieve band gap and emission control while ensuring spectral stability. These include the synthesis of perovskite hollow nanocrystals and phase control of perovskite multiple quantum well thin films. Perovskite hollow nanocrystals are shown to enable band gap and emission tuning through the formation of a hollow 3D crystal structure and quantum confinement. Reduced grain boundaries and passivation of surface trap sites in these nanocrystalline thin films are also shown to result in high radiative efficiencies. Although the formation of perovskite quantum wells has been shown to be an effective strategy to control the band gap and emission, the crystallization of multiple quantum well phases during thin film formation and fast energy funneling across phases has limited the application of perovskite quantum wells in color tunable and blue LEDs. In chapter 3, we show the addition of diammonium salts enables phase control in perovskite multiple quantum well thin films, resulting in color tunable emission. The presence of diammonium salts was also found to increase radiative efficiency enabling the fabrication of pure blue perovskite LEDs with good efficiency. Finally, energy band edge control of quasi-2D perovskites is also presented as a viable solution to charge injection barriers that appear due to unfavorable band alignment in blue perovskite LEDs. By modifying the dipole moment of organic spacer cations in quasi-2D perovskites through the addition of electron donating or withdrawing substituent groups, rational band edge control is achieved which enables improved blue LED performance due to enhanced charge balance. In the second theme of this dissertation, the use of low-dimensional metal halide hybrids in broadband white LEDs for high color quality applications is shown. The broadband emission spectra of low-dimensional metal halide hybrids are shown to be ideal for white light applications that require full spectrum coverage and high color rendering. The dissertation concludes by presenting a few exciting routes that could be explored to further improve the performance of blue and white LEDs based on perovskites and perovskite related materials. The work presented in this dissertation contributes to the field of perovskite LEDs by exploring the structure-processing-property-performance phase space and providing alternative routes to obtain spectrally stable and efficient blue perovskite LEDs as well as excellent light quality white LEDs, which could help transition perovskite LEDs to commercial viability.

Download or read book Perovskite Optoelectronic Devices written by Basudev Pradhan and published by Springer Nature. This book was released on with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of the Structure Property Relationships of Metal Halides written by Matthew Benjamin Gray and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal halide materials encompass a wide range of compounds with many interesting structural and optoelectronic characteristics; the most ubiquitous of these materials are the halide perovskites. The ability to utilize a large number of elements in these compounds makes the possible compositions nearly endless. Herein, we discuss the synthesis and characterization of five new metal halide systems. In Chapter 2, the halide double perovskite solid solution, Cs2AgBiBr6–xClx, is characterized via diffraction and optical absorption techniques, and it is shown that a complete solid solution forms. The ability to engineer the band gap via halide exchange is a powerful tool towards rational material design. In Chapters 3 and 4, exploration of the pseudo-ternary CH3NH3X-AgX-MX3 [M = Sb3+, Bi3+; X = Br–, I–] phase diagrams results in three new phases that have lower dimensionality than the 3-D halide double perovskites. Chapter 3 focuses on AgSbI4, a 2-D layered semiconductor that exhibits significant thermochromism near room temperature as a result of a high degree of electron-phonon coupling. Chapter 4 centers on understanding silver bonding with the heavier halides [Br– and I–]. CH3NH3AgBr2, and CH3NH3Ag2I3 are both synthesized and their 1-D chained structures characterized via a combination of single crystal and synchrotron diffraction. A combination of bond valence sum calculations and literature analysis show that silver has a preference for four-coordinate environment with halide ions, and for the iodides, almost never forms octahedra. Chapters 5 and 6 explore photoluminescence in a pair of halide double perovskite systems: Cs2NaInCl6:Sb3+ and Cs2AgIn1–xBixCl6. The former is a dopant induced phosphor, with bright blue emission (PLQY ≈ 79%) and high thermal stability. The latter, a phosphor based on self-trapped excitonic emission, has one of the most red-shifted excitation profiles of the halide double perovskite phosphors. When coupled with a standard 400 nm light emitting diode, the broad yellow-orange emission of this material can produce warm white light suitable for indoor applications.