Textbook in PDF format The aim of this book is to provide a detailed understanding of the physics underlying semiconductor devices. Coverage includes semiconductor materials, electronic band structure, and charge carrier dynamics. It explains the operation principles of diodes, transistors, and integrated circuits. The book also explores modern advancements such as MOSFETs and optoelectronic devices. Practical aspects like device fabrication and characterization techniques are discussed. This text is intended for electrical engineering and applied physics students