While diamond is often regarded as the ultimate semiconductor due to its superior physical and chemical properties relative to the other candidates, the challenge remains to achieve large diameter films through cost-efficient methods. Chemical vapor deposition (CVD) techniques have enabled the growth of diamond films up to 3 inches (76.2 mm) via heteroepitaxial processes.1 However, the dislocation densities are of the order of 107-109 cm-2. In contrast, high pressure and high temperature (HPHT) techniques have allowed diamond substrates of higher purity and lower defect density to be produced…mehr
While diamond is often regarded as the ultimate semiconductor due to its superior physical and chemical properties relative to the other candidates, the challenge remains to achieve large diameter films through cost-efficient methods. Chemical vapor deposition (CVD) techniques have enabled the growth of diamond films up to 3 inches (76.2 mm) via heteroepitaxial processes.1 However, the dislocation densities are of the order of 107-109 cm-2. In contrast, high pressure and high temperature (HPHT) techniques have allowed diamond substrates of higher purity and lower defect density to be produced relative to those achieved via CVD, though, at this writing, they are limited to a maximum of 10x10 mm2 in size.1 AlN crystal growth faces challenges due to its extremely high melting point of 3200 ,2 making direct melt growth unfeasible. Use of alternative growth techniques, such as physical vapor transport (PVT)3,4 and hydride/halide vapor phase epitaxy (HVPE),5 have allowed the growth ofbulk AlN materials up to 2.5 inches (63.5 mm) in size.
Professor Dr. Richard, for your History of Sound course, I propose "Connecting With Sounds: A Network History." This book explores how technology has fundamentally transformed our relationship with sound. We'll delve into the history of audio technologies ¿ from the phonograph to the internet ¿ and analyze how communication networks have revolutionized how we create, share, and experience music. From the rise of global music cultures to the impact of radio and the internet on soundscapes, "Connecting With Sounds" explores how technology facilitated the exchange of sounds across continents. But this book goes beyond the technical. We'll analyze the social and cultural impact of networked sound, exploring its role in historical events, the influence of social media on music discovery, and the rise of online communities that reshape how we experience music. "Connecting With Sounds" dives deeper, examining how the "network society" itself becomes a network of sound through online platforms and streaming services, fostering new forms of interaction and transforming the role of music curators and DJs. This book is a valuable resource for anyone interested in the fascinating interplay between technology, sound, and society.
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