A new hardcover copy of the 4th or 5th edition typically retails between $150 and $250. For a student already paying for tuition, lab fees, and Arduino kits, that is prohibitive.
Semiconductor physics involves analyzing complex band diagrams and crystal structures. Having a PDF allows students to zoom in on figures, use search functionality (Ctrl+F) to find specific terms like "avalanche breakdown," and carry the book on a tablet to the lab. Semiconductor Physics And Devices - Donald Neamen.pdf
Inside the PDF, there is a table of "Selected Properties of Semiconductors" (usually inside the front cover in physical form). Bookmark this page immediately in your PDF reader. You will refer to it for every homework problem (ni = intrinsic concentration, etc.). A new hardcover copy of the 4th or