Metalorganic Vapor Phase Epitaxy (MOVPE)

Download Metalorganic Vapor Phase Epitaxy (MOVPE) PDF Online Free

Author :
Publisher : John Wiley & Sons
ISBN 13 : 1119313015
Total Pages : 582 pages
Book Rating : 4.1/5 (193 download)

DOWNLOAD NOW!


Book Synopsis Metalorganic Vapor Phase Epitaxy (MOVPE) by : Stuart Irvine

Download or read book Metalorganic Vapor Phase Epitaxy (MOVPE) written by Stuart Irvine and published by John Wiley & Sons. This book was released on 2019-10-07 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Systematically discusses the growth method, material properties, and applications for key semiconductor materials MOVPE is a chemical vapor deposition technique that produces single or polycrystalline thin films. As one of the key epitaxial growth technologies, it produces layers that form the basis of many optoelectronic components including mobile phone components (GaAs), semiconductor lasers and LEDs (III-Vs, nitrides), optical communications (oxides), infrared detectors, photovoltaics (II-IV materials), etc. Featuring contributions by an international group of academics and industrialists, this book looks at the fundamentals of MOVPE and the key areas of equipment/safety, precursor chemicals, and growth monitoring. It covers the most important materials from III-V and II-VI compounds to quantum dots and nanowires, including sulfides and selenides and oxides/ceramics. Sections in every chapter of Metalorganic Vapor Phase Epitaxy (MOVPE): Growth, Materials Properties and Applications cover the growth of the particular materials system, the properties of the resultant material, and its applications. The book offers information on arsenides, phosphides, and antimonides; nitrides; lattice-mismatched growth; CdTe, MCT (mercury cadmium telluride); ZnO and related materials; equipment and safety; and more. It also offers a chapter that looks at the future of the technique. Covers, in order, the growth method, material properties, and applications for each material Includes chapters on the fundamentals of MOVPE and the key areas of equipment/safety, precursor chemicals, and growth monitoring Looks at important materials such as III-V and II-VI compounds, quantum dots, and nanowires Provides topical and wide-ranging coverage from well-known authors in the field Part of the Materials for Electronic and Optoelectronic Applications series Metalorganic Vapor Phase Epitaxy (MOVPE): Growth, Materials Properties and Applications is an excellent book for graduate students, researchers in academia and industry, as well as specialist courses at undergraduate/postgraduate level in the area of epitaxial growth (MOVPE/ MOCVD/ MBE).

Nanostructured Metal Oxides and Devices

Download Nanostructured Metal Oxides and Devices PDF Online Free

Author :
Publisher : Springer Nature
ISBN 13 : 9811533148
Total Pages : 348 pages
Book Rating : 4.8/5 (115 download)

DOWNLOAD NOW!


Book Synopsis Nanostructured Metal Oxides and Devices by : M. K. Jayaraj

Download or read book Nanostructured Metal Oxides and Devices written by M. K. Jayaraj and published by Springer Nature. This book was released on 2020-04-16 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book primarily covers the fundamental science, synthesis, characterization, optoelectronic properties, and applications of metal oxide nanomaterials. It discusses the basic aspects of synthetic procedures and fabrication technologies, explains the related experimental techniques and also elaborates on the current status of nanostructured oxide materials and related devices. Two major aspects of metal oxide nanostructures – their optical and electrical properties – are described in detail. The first five chapters focus on the optical characteristics of semiconducting materials, especially metal oxides at the nanoscale. The following five chapters discuss the electrical properties observed in metal oxide-based semiconductors and the status quo of device-level developments in a variety of applications such as sensors, transistors, dilute magnetic semiconductors, and dielectric materials. The basic science and mechanism behind the optoelectronic phenomena are explained in detail, to aid readers interested in the structure–property symbiosis in semiconducting nanomaterials. In short, the book offers a valuable reference guide for researchers and academics in the areas of material science and semiconductor technology, especially nanophotonics and electronics.

Semiconductor Nanostructures

Download Semiconductor Nanostructures PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 3540778993
Total Pages : 369 pages
Book Rating : 4.5/5 (47 download)

DOWNLOAD NOW!


Book Synopsis Semiconductor Nanostructures by : Dieter Bimberg

Download or read book Semiconductor Nanostructures written by Dieter Bimberg and published by Springer Science & Business Media. This book was released on 2008-06-03 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reducing the size of a coherently grown semiconductor cluster in all three directions of space to a value below the de Broglie wavelength of a charge carrier leads to complete quantization of the energy levels, density of states, etc. Such “quantum dots” are more similar to giant atoms in a dielectric cage than to classical solids or semiconductors showing a dispersion of energy as a function of wavevector. Their electronic and optical properties depend strongly on their size and shape, i.e. on their geometry. By designing the geometry by controlling the growth of QDs, absolutely novel possibilities for material design leading to novel devices are opened. This multiauthor book written by world-wide recognized leaders of their particular fields and edited by the recipient of the Max-Born Award and Medal 2006 Professor Dieter Bimberg reports on the state of the art of the growing of quantum dots, the theory of self-organised growth, the theory of electronic and excitonic states, optical properties and transport in a variety of materials. It covers the subject from the early work beginning of the 1990s up to 2006. The topics addressed in the book are the focus of research in all leading semiconductor and optoelectronic device laboratories of the world.

Energy-Level Control at Hybrid Inorganic/Organic Semiconductor Interfaces

Download Energy-Level Control at Hybrid Inorganic/Organic Semiconductor Interfaces PDF Online Free

Author :
Publisher : Springer
ISBN 13 : 3319466240
Total Pages : 223 pages
Book Rating : 4.3/5 (194 download)

DOWNLOAD NOW!


Book Synopsis Energy-Level Control at Hybrid Inorganic/Organic Semiconductor Interfaces by : Raphael Schlesinger

Download or read book Energy-Level Control at Hybrid Inorganic/Organic Semiconductor Interfaces written by Raphael Schlesinger and published by Springer. This book was released on 2016-11-21 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work investigates the energy-level alignment of hybrid inorganic/organic systems (HIOS) comprising ZnO as the major inorganic semiconductor. In addition to offering essential insights, the thesis demonstrates HIOS energy-level alignment tuning within an unprecedented energy range. (Sub)monolayers of organic molecular donors and acceptors are introduced as an interlayer to modify HIOS interface-energy levels. By studying numerous HIOS with varying properties, the author derives generally valid systematic insights into the fundamental processes at work. In addition to molecular pinning levels, he identifies adsorption-induced band bending and gap-state density of states as playing a crucial role in the interlayer-modified energy-level alignment, thus laying the foundation for rationally controlling HIOS interface electronic properties. The thesis also presents quantitative descriptions of many aspects of the processes, opening the door for innovative HIOS interfaces and for future applications of ZnO in electronic devices.

III-Nitride Semiconductors

Download III-Nitride Semiconductors PDF Online Free

Author :
Publisher : Elsevier
ISBN 13 : 0080534449
Total Pages : 463 pages
Book Rating : 4.0/5 (85 download)

DOWNLOAD NOW!


Book Synopsis III-Nitride Semiconductors by : M.O. Manasreh

Download or read book III-Nitride Semiconductors written by M.O. Manasreh and published by Elsevier. This book was released on 2000-12-06 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research advances in III-nitride semiconductor materials and device have led to an exponential increase in activity directed towards electronic and optoelectronic applications. There is also great scientific interest in this class of materials because they appear to form the first semiconductor system in which extended defects do not severely affect the optical properties of devices. The volume consists of chapters written by a number of leading researchers in nitride materials and device technology with the emphasis on the dopants incorporations, impurities identifications, defects engineering, defects characterization, ion implantation, irradiation-induced defects, residual stress, structural defects and phonon confinement. This unique volume provides a comprehensive review and introduction of defects and structural properties of GaN and related compounds for newcomers to the field and stimulus to further advances for experienced researchers. Given the current level of interest and research activity directed towards nitride materials and devices, the publication of the volume is particularly timely. Early pioneering work by Pankove and co-workers in the 1970s yielded a metal-insulator-semiconductor GaN light-emitting diode (LED), but the difficulty of producing p-type GaN precluded much further effort. The current level of activity in nitride semiconductors was inspired largely by the results of Akasaki and co-workers and of Nakamura and co-workers in the late 1980s and early 1990s in the development of p-type doping in GaN and the demonstration of nitride-based LEDs at visible wavelengths. These advances were followed by the successful fabrication and commercialization of nitride blue laser diodes by Nakamura et al at Nichia. The chapters contained in this volume constitutes a mere sampling of the broad range of research on nitride semiconductor materials and defect issues currently being pursued in academic, government, and industrial laboratories worldwide.

Zinc Oxide

Download Zinc Oxide PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 3642105777
Total Pages : 366 pages
Book Rating : 4.6/5 (421 download)

DOWNLOAD NOW!


Book Synopsis Zinc Oxide by : Claus F. Klingshirn

Download or read book Zinc Oxide written by Claus F. Klingshirn and published by Springer Science & Business Media. This book was released on 2010-07-01 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book gives a comprehensive review of the present state-of-the-art in ZnO R+D, including growth, doping, lattice dynamics, electric magnetic and optical properties. The emphasis is on the electric and optical properties, because this is the area where novel applications may be expected with highest promise. The book highlights not only the most recent results but gives both an overview of past research and of the present status -- not avoiding critical and controversial discussions of various aspects such as bank symmetries and laser processes. Intended to have long-lasting impact on ZnO R+D, this monograph addresses (post-)graduate students but also advanced scientists, who want to embark on ZnO research or are already involved, the present state of the art and assists them in avoiding duplication of old results (or mistakes).

GaN and Related Alloys: Volume 537

Download GaN and Related Alloys: Volume 537 PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 1056 pages
Book Rating : 4.:/5 (318 download)

DOWNLOAD NOW!


Book Synopsis GaN and Related Alloys: Volume 537 by : S. J. Pearton

Download or read book GaN and Related Alloys: Volume 537 written by S. J. Pearton and published by . This book was released on 1999-09-14 with total page 1056 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the full spectrum of activity in the GaN and related materials arena. These semiconductors are finding applications in full-color displays, high-density information storage, white lighting for outdoor or backlit displays, solar-blind UV detectors, high-power/high-temperature electronics, and covert undersea communications. Progress is been reported in the growth of thick layers on patterned substrates by various methods, leading to lower overall defect concentrations and improved current-voltage and reliability characteristics. The rapidly increasing market for blue/green LEDs is also noted by the entry of a number of new companies to the field. While these emitter technologies continue to be dominated by MOCVD material, there are exciting reports of UV detectors and HFET structures grown by MBE with device performance at least as good as by MOCVD. Topics include: GaN electronic and photonic devices; laser diodes and spectroscopy; electronic devices and processing; quantum dots and processing; novel growth, doping and processing and rare-earth doping and optical emission.

Nitride Semiconductor Light-Emitting Diodes (LEDs)

Download Nitride Semiconductor Light-Emitting Diodes (LEDs) PDF Online Free

Author :
Publisher : Woodhead Publishing
ISBN 13 : 0857099302
Total Pages : 673 pages
Book Rating : 4.8/5 (57 download)

DOWNLOAD NOW!


Book Synopsis Nitride Semiconductor Light-Emitting Diodes (LEDs) by : Jian-Jang Huang

Download or read book Nitride Semiconductor Light-Emitting Diodes (LEDs) written by Jian-Jang Huang and published by Woodhead Publishing. This book was released on 2014-02-14 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of nitride-based light-emitting diodes (LEDs) has led to advancements in high-brightness LED technology for solid-state lighting, handheld electronics, and advanced bioengineering applications. Nitride Semiconductor Light-Emitting Diodes (LEDs) reviews the fabrication, performance, and applications of this technology that encompass the state-of-the-art material and device development, and practical nitride-based LED design considerations. Part one reviews the fabrication of nitride semiconductor LEDs. Chapters cover molecular beam epitaxy (MBE) growth of nitride semiconductors, modern metalorganic chemical vapor deposition (MOCVD) techniques and the growth of nitride-based materials, and gallium nitride (GaN)-on-sapphire and GaN-on-silicon technologies for LEDs. Nanostructured, non-polar and semi-polar nitride-based LEDs, as well as phosphor-coated nitride LEDs, are also discussed. Part two covers the performance of nitride LEDs, including photonic crystal LEDs, surface plasmon enhanced LEDs, color tuneable LEDs, and LEDs based on quantum wells and quantum dots. Further chapters discuss the development of LED encapsulation technology and the fundamental efficiency droop issues in gallium indium nitride (GaInN) LEDs. Finally, part three highlights applications of nitride LEDs, including liquid crystal display (LCD) backlighting, infrared emitters, and automotive lighting. Nitride Semiconductor Light-Emitting Diodes (LEDs) is a technical resource for academics, physicists, materials scientists, electrical engineers, and those working in the lighting, consumer electronics, automotive, aviation, and communications sectors. - Reviews fabrication, performance, and applications of this technology that encompass the state-of-the-art material and device development, and practical nitride-based LED design considerations - Covers the performance of nitride LEDs, including photonic crystal LEDs, surface plasmon enhanced LEDs, color tuneable LEDs, and LEDs based on quantum wells and quantum dots - Highlights applications of nitride LEDs, including liquid crystal display (LCD) backlighting, infra-red emitters, and automotive lighting

Chemical Solution Deposition of Functional Oxide Thin Films

Download Chemical Solution Deposition of Functional Oxide Thin Films PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 3211993118
Total Pages : 801 pages
Book Rating : 4.2/5 (119 download)

DOWNLOAD NOW!


Book Synopsis Chemical Solution Deposition of Functional Oxide Thin Films by : Theodor Schneller

Download or read book Chemical Solution Deposition of Functional Oxide Thin Films written by Theodor Schneller and published by Springer Science & Business Media. This book was released on 2014-01-24 with total page 801 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first text to cover all aspects of solution processed functional oxide thin-films. Chemical Solution Deposition (CSD) comprises all solution based thin- film deposition techniques, which involve chemical reactions of precursors during the formation of the oxide films, i. e. sol-gel type routes, metallo-organic decomposition routes, hybrid routes, etc. While the development of sol-gel type processes for optical coatings on glass by silicon dioxide and titanium dioxide dates from the mid-20th century, the first CSD derived electronic oxide thin films, such as lead zirconate titanate, were prepared in the 1980’s. Since then CSD has emerged as a highly flexible and cost-effective technique for the fabrication of a very wide variety of functional oxide thin films. Application areas include, for example, integrated dielectric capacitors, ferroelectric random access memories, pyroelectric infrared detectors, piezoelectric micro-electromechanical systems, antireflective coatings, optical filters, conducting-, transparent conducting-, and superconducting layers, luminescent coatings, gas sensors, thin film solid-oxide fuel cells, and photoelectrocatalytic solar cells. In the appendix detailed “cooking recipes” for selected material systems are offered.

Chemical Imaging Analysis

Download Chemical Imaging Analysis PDF Online Free

Author :
Publisher : Elsevier
ISBN 13 : 0444634509
Total Pages : 493 pages
Book Rating : 4.4/5 (446 download)

DOWNLOAD NOW!


Book Synopsis Chemical Imaging Analysis by : Freddy Adams

Download or read book Chemical Imaging Analysis written by Freddy Adams and published by Elsevier. This book was released on 2015-06-06 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical Imaging Analysis covers the advancements made over the last 50 years in chemical imaging analysis, including different analytical techniques and the ways they were developed and refined to link the composition and structure of manmade and natural materials at the nano/micro scale to the functional behavior at the macroscopic scale. In a development process that started in the early 1960s, a variety of specialized analytical techniques was developed – or adapted from existing techniques – and these techniques have matured into versatile and powerful tools for visualizing structural and compositional heterogeneity. This text explores that journey, providing a general overview of imaging techniques in diverse fields, including mass spectrometry, optical spectrometry including X-rays, electron microscopy, and beam techniques. - Provides comprehensive coverage of analytical techniques used in chemical imaging analysis - Explores a variety of specialized techniques - Provides a general overview of imaging techniques in diverse fields

Nitride Semiconductors: Volume 482

Download Nitride Semiconductors: Volume 482 PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 1274 pages
Book Rating : 4.3/5 (91 download)

DOWNLOAD NOW!


Book Synopsis Nitride Semiconductors: Volume 482 by : Materials Research Society. Meeting

Download or read book Nitride Semiconductors: Volume 482 written by Materials Research Society. Meeting and published by . This book was released on 1998-04-20 with total page 1274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is on recent experimental and theoretical progress in the rapidly growing field of III-V nitrides. Issues related to crystal growth (bulk and thin films), structure and microstructure, formation of defects, doping, alloying, formation of heterostructures, determination of physical properties and device fabrication and evaluation are addressed. Papers show much progress in the growth and understanding of III-V nitrides and in the production of optoelectronic devices based on these materials. Most exciting is the fact that light-emitting diodes and laser diodes have now reached amazing levels of performance which forecasts a revolution in lighting, optical storage, printing, and display technologies. Topics include: crystal growth- bulk growth, early stages of epitaxy; crystal growth- MOCVD; growth techniques - MBE and HVPE; novel substrates and growth techniques; structural properties; electronic properties; luminescence and recombination; characterization, elemental and stress analysis; physical modelling; device processing, implantation, annealing; device characterization, contacts, degradation; and injection laser diodes and applications.

III-Nitride Semiconductors and Their Modern Devices

Download III-Nitride Semiconductors and Their Modern Devices PDF Online Free

Author :
Publisher : Semiconductor Science and Tech
ISBN 13 : 0199681724
Total Pages : 661 pages
Book Rating : 4.1/5 (996 download)

DOWNLOAD NOW!


Book Synopsis III-Nitride Semiconductors and Their Modern Devices by : Bernard Gil

Download or read book III-Nitride Semiconductors and Their Modern Devices written by Bernard Gil and published by Semiconductor Science and Tech. This book was released on 2013-08-22 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: All recent developments of nitrides and of their technology are gathered here in a single book, with chapters written by world leaders in the field.

Communication physics

Download Communication physics PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 223 pages
Book Rating : 4.:/5 (449 download)

DOWNLOAD NOW!


Book Synopsis Communication physics by : Alessia Bertagnolli

Download or read book Communication physics written by Alessia Bertagnolli and published by . This book was released on 2006 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Wide Bandgap Semiconductors

Download Wide Bandgap Semiconductors PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 3540472355
Total Pages : 481 pages
Book Rating : 4.5/5 (44 download)

DOWNLOAD NOW!


Book Synopsis Wide Bandgap Semiconductors by : Kiyoshi Takahashi

Download or read book Wide Bandgap Semiconductors written by Kiyoshi Takahashi and published by Springer Science & Business Media. This book was released on 2007-04-12 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a comprehensive overview of the development, current state, and future prospects of wide bandgap semiconductor materials and related optoelectronics devices. With 901 references, 333 figures and 21 tables, this book will serve as a one-stop source of knowledge on wide bandgap semiconductors and related optoelectronics devices.

Biopolymer Composites in Electronics

Download Biopolymer Composites in Electronics PDF Online Free

Author :
Publisher : Elsevier
ISBN 13 : 0081009747
Total Pages : 546 pages
Book Rating : 4.0/5 (81 download)

DOWNLOAD NOW!


Book Synopsis Biopolymer Composites in Electronics by : Kishor Kumar Sadasivuni

Download or read book Biopolymer Composites in Electronics written by Kishor Kumar Sadasivuni and published by Elsevier. This book was released on 2016-09-10 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biopolymer Composites in Electronics examines the current state-of-the-art in the electronic application based on biopolymer composites. Covering the synthesis, dispersion of fillers, characterization and fabrication of the composite materials, the book will help materials scientists and engineers address the challenges posed by the increased use of biopolymeric materials in electronic applications. The influence of preparation techniques on the generation of micro, meso, and nanoscale fillers, and the effect of filler size and dispersion on various biopolymers are discussed in detail. Applications covered include sensors, actuators, optics, fuel cells, photovoltaics, dielectrics, electromagnetic shielding, piezoelectrics, flexible displays, and microwave absorbers. In addition, characterization techniques are discussed and compared, enabling scientists and engineers to make the correct choice of technique. This book is a 'one-stop' reference for researchers, covering the entire state-of-the-art in biopolymer electronics. Written by a collection of expert worldwide contributors from industry, academia, government, and private research institutions, it is an outstanding reference for researchers in the field of biopolymer composites for advanced technologies. - Enables researchers to keep up with the rapid development of biopolymer electronics, which offer light, flexible, and more cost-effective alternatives to conventional materials of solar cells, light-emitting diodes, and transistors - Includes thorough coverage of the physics and chemistry behind biopolymer composites, helping readers to become rapidly acquainted with the fiel - Provides in-depth information on the range of biopolymer applications in electronics, from printed flexible conductors and novel semiconductor components, to intelligent labels, large area displays, and solar panels

Diode Lasers and Photonic Integrated Circuits

Download Diode Lasers and Photonic Integrated Circuits PDF Online Free

Author :
Publisher : John Wiley & Sons
ISBN 13 : 1118148185
Total Pages : 752 pages
Book Rating : 4.1/5 (181 download)

DOWNLOAD NOW!


Book Synopsis Diode Lasers and Photonic Integrated Circuits by : Larry A. Coldren

Download or read book Diode Lasers and Photonic Integrated Circuits written by Larry A. Coldren and published by John Wiley & Sons. This book was released on 2012-03-02 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diode Lasers and Photonic Integrated Circuits, Second Edition provides a comprehensive treatment of optical communication technology, its principles and theory, treating students as well as experienced engineers to an in-depth exploration of this field. Diode lasers are still of significant importance in the areas of optical communication, storage, and sensing. Using the the same well received theoretical foundations of the first edition, the Second Edition now introduces timely updates in the technology and in focus of the book. After 15 years of development in the field, this book will offer brand new and updated material on GaN-based and quantum-dot lasers, photonic IC technology, detectors, modulators and SOAs, DVDs and storage, eye diagrams and BER concepts, and DFB lasers. Appendices will also be expanded to include quantum-dot issues and more on the relation between spontaneous emission and gain.

Sapphire

Download Sapphire PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 0387856951
Total Pages : 493 pages
Book Rating : 4.3/5 (878 download)

DOWNLOAD NOW!


Book Synopsis Sapphire by : Elena R. Dobrovinskaya

Download or read book Sapphire written by Elena R. Dobrovinskaya and published by Springer Science & Business Media. This book was released on 2009-04-21 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: By the second half of the twentieth century, a new branch of materials science had come into being — crystalline materials research. Its appearance is linked to the emergence of advanced technologies primarily based on single crystals (bulk crystals and films). At the turn of the last century, the impending onset of the “ceramic era” was forecasted. It was believed that ceramics would play a role comparable to that of the Stone or Bronze Ages in the history of civilization. Naturally, such an assumption was hypothetical, but it showed that ceramic materials had evoked keen interest among researchers. Although sapphire traditionally has been considered a gem, it has developed into a material typical of the “ceramic era.” Widening the field of sapphire application necessitated essential improvement of its homogeneity and working characteristics and extension of the range of sapphire products, especially those with stipulated properties including a preset structural defect distribution. In the early 1980s, successful attainment of crystals with predetermined char- teristics was attributed to proper choice of the growth method. At present, in view of the fact that the requirements for crystalline products have become more str- gent, such an approach tends to be insufficient. It is clear that one must take into account the physical–chemical processes that take place during the formation of the real crystal structure, i.e., the growth mechanisms and the nature and causes of crystal imperfections.