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This book provides a summary of the current state-of-the-art in SiC and GaN and identify future areas of development. The remarkable improvements in material quality and device performance in the last few years show the promise of these technologies for areas that Si cannot operate because of it's smaller bandgap. We feel that this collection of chapters provides an excellent introduction to the field and is an outstanding reference for those performing research on wide bandgap semiconductors.In this book, we bring together numerous experts in the field to review progress in SiC and GaN electronic devices and novel detectors. Professor Morkoc reviews the growth and characterization of nitrides, followed by chapters from Professor Shur, Professor Karmalkar, and Professor Gaska on High Electron Mobility Transistors, Professor Pearton and co-workers on ultra-high breakdown voltage GaN-based rectifiers and the group of Professor Abernathy on emerging MOS devices in the nitride system. Dr Baca from Sandia National Laboratories and Dr Chang from Agilent review the use of mixed group V-nitrides as the base layer in novel Heterojunction Bipolar Transistors. There are 3 chapters on SiC, including Professor Skowronski on growth and characterization, Professor Chow on power Schottky and pin rectifiers and Professor Cooper on power MOSFETs. Professor Dupuis and Professor Campbell give an overview of short wavelength, nitride based detectors. Finally, Jihyun Kim and co-workers describe recent progress in wide bandgap semiconductor spintronics where one can obtain room temperature ferromagnetism and exploit the spin of the electron in addition to its charge.
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This book provides a comprehensive summary of the status of emerging sensor technologies and provides a framework for future advances in the field. Chemical sensors have gained in importance in the past decade for applications that include homeland security, medical and environmental monitoring and also food safety. A desirable goal is the ability to simultaneously analyze a wide variety of environmental and biological gases and liquids in the field and to be able to selectively detect a target analyte with high specificity and sensitivity. The goal is to realize real-time, portable and inexpensive chemical and biological sensors and to use these as monitors for handheld gas, environmental pollutant, exhaled breath, saliva, urine, or blood, with wireless capability.In the medical area, frequent screening can catch the early development of diseases, reduce the suffering of patients due to late diagnoses, and lower the medical cost. For example, a 96% survival rate has been predicted in breast cancer patients if the frequency of screening is every three months. This frequency cannot be achieved with current methods of mammography due to high cost to the patient and invasiveness (radiation). In the area of detection of medical biomarkers, many different methods, including enzyme-linked immunsorbent assay (ELISA), particle-based flow cytometric assays, electrochemical measurements based on impedance and capacitance, electrical measurement of microcantilever resonant frequency change, and conductance measurement of semiconductor nanostructures, gas chromatography (GC), ion chromatography, high density peptide arrays, laser scanning quantitiative analysis, chemiluminescence, selected ion flow tube (SIFT), nanomechanical cantilevers, bead-based suspension microarrays, magnetic biosensors and mass spectrometry (MS) have been employed. Depending on the sample condition, these methods may show variable results in terms of sensitivity for some applications and may not meet the requirements for a handheld biosensor.