Metal Halide Perovskites For Generation Manipulation And Detection Of Light

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

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.

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.

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

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.

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.

As an emerging class of semiconductors, metal halide perovskites have demonstrated tremendous potential in various applications, including photovoltaic solar cells, light-emitting diodes, photodetection, and many other electronic devices. While most of these perovskite electronic devices have adopted polycrystalline perovskite thin films, problems of polycrystalline thin films like the high density of grain boundaries and defects, low stability can hinder the further performance enhancement of perovskite electronic devices. Comparing with their polycrystalline counterpart, single-crystal perovskites provide opportunities in solving such problems. Not only can they provide enhanced crystalline quality and excellent material stability, but also the possibility to alter the electronic properties of perovskites by lattice-mismatch-induced strain. Yet the development of single-crystal perovskite electronic devices is still in its infancy due to the low controllability over the growth of single-crystal perovskite nano/micro-structures and the incompatibility with the conventional semiconductor fabrication protocol. This research aims to develop a platform for growing high-quality single-crystal metal halide perovskite nano/micro-structures using controllable chemical homo/heteroepitaxial growth and fabricating high-performance single-crystal-perovskite-based electronic devices with the conventional semiconductor fabrication protocols. In Chapter One, the basic properties of metal halide perovskites and the current problems presented in the polycrystalline perovskite thin films will be introduced and discussed. In Chapter Two, controllable homoepitaxial growth of metal halide perovskite micro-arrays will be introduced. Our work presents the first controllable growth of large-area single-crystal perovskite microarrays with different sizes, morphologies, crystalline orientations, and patterned structures. In Chapter Three, controllable strain engineering of single-crystal metal halide perovskite thin films by heteroepitaxial-growth-induced lattice mismatch will be introduced. Our work presents the first controllable strain engineering in metal halide perovskite family. In Chapter Four, epitaxial stabilization induced by the chemically epitaxial strain growth will be introduced. Our strategy provides insights into structurally stabilizing the metastable metal halide perovskite family. Our understanding of the controllable epitaxial growth of metal halide perovskites paves the way for next-generation single-crystal metal halide perovskites electronic devices.

Low-Dimensional Halide Perovskites: Structure, Properties and Applications provides an in-depth look at halide perovskite materials and their applications. Chapters cover history, fundamentals, physiochemical and optoelectronic properties, synthesis and characterization of traditional and Pb-free halide perovskites. The book concludes with sections describing the different applications of halide perovskites for solar cells, light-emitting diodes and photo detectors, as well as the challenges faced in the industrialization of halide perovskite-based devices and forward-thinking prospects for further deployment. Discusses the applications of halide perovskites according to their dimensionality Includes a look at current challenges for the commercialization of halide perovskites, while also previewing some possible solutions Presents alternative environmentally-friendly materials that can used to replace the current toxic materials-based halide perovskites

Metal halide perovskites (MHPs) have attracted the attention of researchers particularly in the photo-absorption field. These materials rival traditional semiconductors with their cost-effective ease of synthesis, tunable bandgaps, and excellent photophysical properties. Single-junction MHP solar cells have rivaled current silicon-based photovoltaic devices, boasting a 25.2% light absorption conversion. Recently, MHPs have proven to be effective in x-ray detection. In this paper an investigation of three titanium-based MHPs was conducted. The goal of this research was to characterize the MHPs and determine if they are feasible materials to incorporate in x-ray detectors. After completing the research, two MHP species, FA2TiI6 and MA3TiCl7, were able to be synthesized and characterized. Their crystal systems were determined to be tetragonal with a P4/mmm space group. However, due to equipment limitations, their feasibility in x-ray detectors could not be determined.