The book "Nano-Electronic Devices" offers a comprehensive examination of advanced simulation methods necessary for the accurate modeling of modern nanoscale devices. It systematically addresses theoretical approaches and numerical solutions used to explain the operation of both power devices and nanoscale devices. A central concern of the book is to assist researchers in selecting the appropriate methods for different types of devices, which is one of the most critical challenges in modeling semiconductor devices. The clear and precise presentation of the content makes it a valuable reference work for students and professionals in the fields of engineering and IT.