Materials which have electrical conductivity are known as semiconductors. These materials have different properties like being sensitive to heat and light, passing current in one direction, having variable resistance, can emit light, can be used as thermal energy converters, etc. The most common semiconductor materials are germanium, silicon carbide, organic compounds, gallium arsenide, silicon, etc. This book unfolds the innovative aspects of semiconductors which will be crucial for the holistic understanding of the subject matter. Most of the topics introduced in it cover new techniques and the applications of the semiconductor materials. This textbook is meant for students who are looking for an elaborate reference text on semiconductors.