All papers have been peer-reviewed. This is the most important conference in the field of semiconductor physics. It has been held biennially since 1951. The proceedings cover a wide range of topics, from fundamental structural, vibrational, and electronic properties to device applications. Special emphasis is given to areas of current interest such as nitride semiconductors, nanostructures, spintronics, and quantum computing. This volume is a fundamental reference for physicists, chemists, materials scientists, and electrical engineers.