Jung Han - Böcker

This book presents progress in device processing and materials characterization of the wide-bandgap semiconductor gallium nitride (GaN) and related materials for power electronics applications. The content of the book is based on the output of multiple well defined and actively managed programs from the U.S. Department of Energy’s Advanced Research Projects Agency-Energy (ARPA-E). The material is organized into eight parts with a total of 28 chapters contributed from invited experts that were part of the ARPA-E programs along with chapters from a few select experts from around the world who are actively engaged in GaN and related WBG semiconductor research and development.The book includes an overview of GaN power electronic devices and systems and a comprehensive review of the key vertical device processing challenges (Part I), detailed descriptions of bulk GaN substrate technology (Part II), discussions of the challenges in GaN epitaxial growth and processing (Part III), an in-depth examination of approaches and challenges in GaN selective area p-type doping with an eye towards mechanistic understanding (Part IV), an overview of innovative material characterization techniques developed to understand the device processing challenges (Part V), an analysis of the fundamental materials properties of GaN in relation to its use in power electronics (Part VI), a discussion of related earlier stage nitride wide bandgap materials development and application in power electronics and other applications (Part VII), and concludes with a forward-looking discussion of the areas that still need research and development to push the limits of power electronics to utilize wide bandgap semiconductors along with potential high impact application areas (Part VIII).This book is intended to be an essential reference for anyone working in either basic research or advanced development of vertical architecture GaN power electronics and technologies. It is anticipated this book will become a go-to reference for any scientist and engineer working in any nitride semiconductor material seeking an updated coverage of the state-of-the-art processing and characterization techniques that will push GaN know-how to new materials and device frontiers.

Light emitting diodes (LEDs) are already used in traffic signals, signage lighting, and automotive applications. However, its ultimate goal is to replace traditional illumination through LED lamps since LED lighting significantly reduces energy consumption and cuts down on carbon-dioxide emission. Despite dramatic advances in LED technologies (e.g., growth, doping and processing technologies), however, there remain critical issues for further improvements yet to be achieved for the realization of solid-state lighting. This book aims to provide the readers with some contemporary LED issues, which have not been comprehensively discussed in the published books and, on which the performance of LEDs is seriously dependent. For example, most importantly, there must be a breakthrough in the growth of high-quality nitride semiconductor epitaxial layers with a low density of dislocations, in particular, in the growth of Al-rich and and In-rich GaN-based semiconductors. The materials quality is directly dependent on the substrates used, such as sapphire, Si, etc. In addition, efficiency droop, growth on different orientations and polarization are also important. Chip processing and packaging technologies are key issues. This book presents a comprehensive review of contemporary LED issues. Given the interest and importance of future research in nitride semiconducting materials and solid state lighting applications, the contents are very timely. The book is composed of chapters written by leading researchers in III-nitride semiconducting materials and device technology. This book will be of interest to scientists and engineers working on LEDs for lighting applications. Postgraduate researchers working on LEDs will also benefit from the issues this book provides.

The revised edition of this important book presents updated and expanded coverage of light emitting diodes (LEDs) based on heteroepitaxial GaN on Si substrates, and includes new chapters on tunnel junction LEDs, green/yellow LEDs, and ultraviolet LEDs.Over the last two decades, significant progress has been made in the growth, doping and processing technologies of III-nitride based semiconductors, leading to considerable expectations for nitride semiconductors across a wide range of applications. LEDs are already used in traffic signals, signage lighting, and automotive applications, with the ultimate goal of the global replacement of traditional incandescent and fluorescent lamps, thus reducing energy consumption and cutting down on carbon-dioxide emission.However, some critical issues must be addressed to allow the further improvements required for the large-scale realization of solid-state lighting, and this book aims to provide the readers with details of somecontemporary issues on which the performance of LEDs is seriously dependent. Most importantly, it describes why there must be a breakthrough in the growth of high-quality nitride semiconductor epitaxial layers with a low density of dislocations, in particular, in the growth of Al-rich and In-rich GaN-based semiconductors. The quality of materials is directly dependent on the substrates used, such as sapphire and Si, and the book discusses these as well as topics such as efficiency droop, growth in different orientations, polarization, and chip processing and packaging technologies.Offering an overview of the state of the art in III-Nitride LED science and technology, the book will be a core reference for researchers and engineers involved with the developments of solid state lighting, and required reading for students entering the field.